Journal articles on the topic 'SPI nanofibers'
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Lee, Hyun-Jung, Celine DG Abueva, Andrew R. Padalhin, and Byong-Taek Lee. "Soya protein isolate-polyethylene oxide electrospun nanofiber membrane with bone marrow-derived mesenchymal stem cell for enhanced bone regeneration." Journal of Biomaterials Applications 34, no. 8 (December 5, 2019): 1142–49. http://dx.doi.org/10.1177/0885328219891614.
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In this study, we prepared an electrospun nanofiber membrane from soya protein isolate (SPI) and polyethylene oxide (PEO) loaded with rat bone marrow-derived mesenchymal stem cells (rBMSC), as a cell-scaffold approach to enhance bone regeneration. Different ratios of SPI:PEO (7:0, 7:1, 7:3, 7:5, and 0:7) was investigated to obtain uniform nanofibers, and crosslinked with EDC/NHS to stabilize the membranes. SPI/PEO membrane (7:3) was found to create more uniform and stable nanofibers at a flow rate of 9 µL/min, spun in a cylindrical collector rotating at 350 r/min, 23 kV DC voltage, and needle tip to collector distance of 13 cm. The loaded rBMSC were pre-differentiated to ensure commitment towards osteoblastic lineage. The SPI/PEO electrospun nanofiber membranes were successful in allowing for cell attachment and growth of the rBMSC and was further investigated in vivo using a rat skull defect model. New bone formation was observed for the optimized SPI/PEO electrospun nanofiber membrane (7:3) with and without rBMSC, but with faster new bone formation for SPI/PEO electrospun nanofiber membrane loaded with rBMSC as compared to SPI/PEO electrospun nanofiber membrane only and control (defect only).
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Phiriyawirut, M., N. Rodchanacheewa, N. Nensiri, and Pitt Supaphol. "Morphology of Electrospun Mats of Soy Protein Isolate and its Blend." Advanced Materials Research 55-57 (August 2008): 733–36. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.733.
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Electrospinning has been recognized as an efficient technique for the forming of polymer nanofibers. In this project interest fabricated Soy Protein Isolate (SPI) nanofibers by electrospinning with different supply voltages, positive and negative charge. SPI was dissolved in 80%-95% w/w acetic acid solution and 80%-90% w/w formic acid solution. Only droplet formation of SPI were found instead of fibril formation, and the droplet morphology of SPI is depended on supply voltage, and type of solvent. SPI droplets from the negative supply voltage have smaller and more nodular than droplets from positive supply voltage. Formic acid SPI solution gives smaller size of droplet and more nodular than acetic acid SPI solution. In order to forming SPI nanofibers, zein/SPI blend were performed. The zein/SPI blend was studied at difference blending ratio. The 95/5 Zein/SPI was found to be the best blend composition for electrospun fiber. In addition, the effects of electrostatic distance and electrostatic voltage on electrospun fiber were also investigated. Increasing electrostatic distance or increasing voltage, smaller size of fiber was obtained.
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Qin, Zhiyong, Liuting Mo, Murong Liao, Hua He, and Jianping Sun. "Preparation and Characterization of Soy Protein Isolate-Based Nanocomposite Films with Cellulose Nanofibers and Nano-Silica via Silane Grafting." Polymers 11, no. 11 (November 7, 2019): 1835. http://dx.doi.org/10.3390/polym11111835.
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Soy protein isolate (SPI) has attracted considerable attention in the field of packaging technology due to its easy processability, biodegradability, and good film-forming characteristics. However, SPI-based films often suffer from inferior mechanical properties and high moisture sensitivity, thus restricting their practical application. In the present study, herein, a biobased nanocomposite film was developed by cross-linking SPI matrix from the synergistic reinforcement of cellulose nanofibers (CNF) and nano-silica (NS) particles. First, we functionalized the CNF with NS using a silane agent (KH560) as an efficient platform to enhance the interfacial interaction between SPI and CNF/NS, resulting from the epoxy-dominated cross-linking reaction. The chemical structure, thermal stability, and morphology of the resultant nanocomposite films were comprehensively investigated via Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). These results supported successful surface modification and indicated that the surface-tailored CNF/NS nanohybrid possesses excellent adhesion with SPI matrix through covalent and hydrogen-bonding interactions. The integration of CNF/NS into SPI resulted in nanocomposite films with an improved tensile strength (6.65 MPa), representing a 90.54% increase compared with the pristine SPI film. Moreover, the resulting composites had a significantly decreased water vapor permeation and a higher water contact angle (91.75°) than that of the unmodified film. The proposed strategy of synergistic reinforcements in the biobased composites may be a promising and green approach to address the critical limitations of plant protein-based materials in practical applications.
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Wei, Ningsi, Murong Liao, Kaijie Xu, and Zhiyong Qin. "High-performance soy protein-based films from cellulose nanofibers and graphene oxide constructed synergistically via hydrogen and chemical bonding." RSC Advances 11, no. 37 (2021): 22812–19. http://dx.doi.org/10.1039/d1ra02484a.
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Chae, Ji Su, Won-seop Kang, and Kwang Chul Roh. "sp2–sp3 Hybrid Porous Carbon Materials Applied for Supercapacitors." Energies 14, no. 19 (September 22, 2021): 5990. http://dx.doi.org/10.3390/en14195990.
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Carbon materials have gained considerable attention in recent years due to their superior properties. Activated carbon has been used in supercapacitors due to its density and rapid adsorption capability. The sp2–sp3 hybrid porous carbon materials are synthesized using herringbone-type carbon nanofibers (CNFs) and carbonized spherical phenol resins, with KOH as the activating agent. The morphology of the hybrid porous carbon facilitates the formation of ribbon-like nanosheets from highly activated CNFs wrapped around spherical resin-based activated carbon. The etching and separation of the CNFs produce a thin ribbon-like nanosheet structure; these CNFs simultaneously form new bonds with activated carbon, forming the sp2–sp3 hybrid porous structure. The relatively poor electrical conductivity of amorphous carbon is improved by the 3D conductive network that interconnects the CNF and amorphous carbon without requiring additional conductive material. The composite electrode has high electron conductivity and a large surface area with a specific capacitance of 120 F g−1. Thus, the strategy substantially simplifies the hybrid materials of sp2-hybridized CNFs and sp3-hybridized amorphous spherical carbon and significantly improves the comprehensive electrochemical performance of supercapacitors. The developed synthesis strategy provides important insights into the design and fabrication of carbon nanostructures that can be potentially applied as electrode materials for supercapacitors.
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Matysiak, Wiktor, Tomasz Tański, and Weronika Monika Smok. "Morphology and structure characterization of crystalline SnO2 1D nanostructures." Photonics Letters of Poland 12, no. 3 (September 30, 2020): 70. http://dx.doi.org/10.4302/plp.v12i3.1019.
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In recent years, many attempts have been made to improve the sensory properties of SnO2, including design of sensors based on one-dimensional nanostructures of this material, such as nanofibers, nanotubes or nanowires. One of the simpler methods of producing one-dimensional tin oxide nanomaterials is to combine the electrospinning method with a sol-gel process. The purpose of this work was to produce SnO2 nanowires using a hybrid electrospinning method combined with a heat treatment process at the temperature of 600 °C and to analyze the morphology and structure of the one-dimensional nanomaterial produced in this way. Analysis of the morphology of composite one-dimensional tin oxide nanostructures showed that smooth, homogeneous and crystalline nanowires were obtained. Full Text: PDF ReferencesN. Dharmaraj, C.H. Kim, K.W. Kim, H.Y. Kim, E.K. Suh, "Spectral studies of SnO2 nanofibres prepared by electrospinning method", Spectrochim. Acta - Part A Mol. Biomol. Spectrosc. 64, (2006) CrossRef N. Gao, H.Y. Li, W. Zhang, Y. Zhang, Y. Zeng, H. Zhixiang, ... & H. Liu, "QCM-based humidity sensor and sensing properties employing colloidal SnO2 nanowires", Sens. Actuators B Chem. 293, (2019), 129-135. CrossRef W. Ge, Y. Chang, V. Natarajan, Z. Feng, J. Zhan, X. Ma, "In2O3-SnO2 hybrid porous nanostructures delivering enhanced formaldehyde sensing performance", J.Alloys and Comp. 746, (2018) CrossRef M. Zhang, Y. Zhen, F. Sun, C. Xu, "Hydrothermally synthesized SnO2-graphene composites for H2 sensing at low operating temperature", Mater. Sci. Eng. B. 209, (2016), 37-44. CrossRef Y. Zhang, X. He, J. Li, Z. Miao, F. Huang, "Fabrication and ethanol-sensing properties of micro gas sensor based on electrospun SnO2 nanofibers", Sens. Actuators B Chem. 132, (2008), 67-73. CrossRef W.Q. Li, S.Y. Ma, J. Luo, Y.Z. Mao, L. Cheng, D.J. Gengzang, X.L. Xu, S H. Yan, "Synthesis of hollow SnO2 nanobelts and their application in acetone sensor", Mater. Lett. 132, (2014), 338-341. CrossRef E. Mudra, I. Shepa, O. Milkovic, Z. Dankova, A. Kovalcikova, A. Annusova, E. Majkova, J. Dusza, "Effect of iron doping on the properties of SnO2 nano/microfibers", Appl. Surf. Sci. 480, (2019), 876-881. CrossRef P. Mohanapriya, H. Segawa, K. Watanabe, K. Watanabe, S. Samitsu, T.S. Natarajan, N.V. Jaya, N. Ohashi, "Enhanced ethanol-gas sensing performance of Ce-doped SnO2 hollow nanofibers prepared by electrospinning", Sens. Actuators B Chem. 188, (2013), 872-878. CrossRef W.Q. Li, S.Y. Ma, Y.F. Li, X.B. Li, C.Y. Wang, X.H. Yang, L. Cheng, Y.Z. Mao, J. Luo, D.J. Gengzang, G.X. Wan, X.L. Xu, "Preparation of Pr-doped SnO2 hollow nanofibers by electrospinning method and their gas sensing properties", J.Alloys and Comp. 605, (2014), 80-88. CrossRef X.H. Xu, S.Y. Ma, X.L. Xu, T. Han, S.T. Pei, Y. Tie, P.F. Cao, W.W. Liu, B.J. Wang, R. Zhang, J.L. Zhang, "Ultra-sensitive glycol sensing performance with rapid-recovery based on heterostructured ZnO-SnO2 hollow nanotube", Mater. Lett, 273, (2020), 127967. CrossRef F. Li, X. Gao, R. Wang, T. Zhang, G. Lu, Sens. "Study on TiO2-SnO2 core-shell heterostructure nanofibers with different work function and its application in gas sensor", Actuators B Chem, 248, (2017), 812-819. CrossRef S. Bai, W. Guo, J. Sun, J. Li, Y. Tian, A. Chen, R. Luo, D. Li, "Synthesis of SnO2–CuO heterojunction using electrospinning and application in detecting of CO", Sens Actuators B Chem, 226, (2016), 96-103. CrossRef H. Du, P.J. Yao, Y. Sun, J. Wang, H. Wang, N. Yu, "Electrospinning Hetero-Nanofibers In2O3/SnO2 of Homotype Heterojunction with High Gas Sensing Activity", Sensors, 17, (2017), 1822. CrossRef X. Wang, H. Fan, P. Ren, "Electrospinning derived hollow SnO2 microtubes with highly photocatalytic property", Catal. Commun. 31, (2013), 37-41. CrossRef L. Cheng, S.Y. Ma, T.T. Wang, X.B. Li, J. Luo, W.Q. Li, Y.Z. Mao, D.J Gengzang, "Synthesis and characterization of SnO2 hollow nanofibers by electrospinning for ethanol sensing properties", Mater. Lett. 131, (2014), 23-26. CrossRef P.H. Phuoc, C.M. Hung, N.V. Toan, N.V. Duy, N.D. Hoa, N.V. Hieu, "One-step fabrication of SnO2 porous nanofiber gas sensors for sub-ppm H2S detection", Sens. Actuators A Phys. 303, (2020), 111722. CrossRef A.E. Deniz, H.A. Vural, B. Ortac, T. Uyar, "Gold nanoparticle/polymer nanofibrous composites by laser ablation and electrospinning", Matter. Lett. 65, (2011), 2941-2943. CrossRef S. Sagadevan, J. Podder, "Investigation on Structural, Surface Morphological and Dielectric Properties of Zn-doped SnO2 Nanoparticles", Mater. Res. 19, (2016), 420-425. CrossRef
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KUMAR, A., and SOMIK BANERJEE. "SWIFT HEAVY ION IRRADIATION: A NOVEL TECHNIQUE FOR TAILORING THE SIZE OF POLYANILINE NANOFIBERS." International Journal of Nanoscience 10, no. 01n02 (February 2011): 161–65. http://dx.doi.org/10.1142/s0219581x11007442.
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Swift heavy ion (SHI) (energy > 1 MeV/u) irradiation of polymer nanostructures is a novel technique to tailor their structure and properties. Polyaniline nanofibers synthesized by interfacial polymerization using HCl and camphor sulfonic acid (CSA) as dopants have been irradiated with 90 MeV O 7+ ion at different fluences of 3 × 1010, 3 × 1011, and 1 × 1012 ions/cm2. TEM micrographs of the irradiated nanofibers reveal a gradual decrease in the size of the nanofibers with an increase in fluence, which could be attributed to the strain-induced fragmentation upon SHI irradiation. The generation of strain in the PAni nanofibers upon SHI irradiation can be explained on the basis of the Coulomb explosion model. X-ray diffraction analysis for both the HCl and CSA-doped nanofibers shows broadening of the peak at 2θ = 20.050, which can be attributed to the reduced domain length and enhanced strain in the material. The two contributions have been separated out. The samples have been characterized with microRaman spectroscopy, which shows a decrease in the intensity of the Raman active modes that can be attributed to the reduction in size of the nanofibers leading to the amorphization of the material.
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Ismail, Mohamed, Sara Ibrahim, Azza El-Amir, Amira EL-Rafei, Nageh Allam, and Ahmed Abdellatif. "Genistein Loaded Nanofibers Protect Spinal Cord Tissue Following Experimental Injury in Rats." Biomedicines 6, no. 4 (October 4, 2018): 96. http://dx.doi.org/10.3390/biomedicines6040096.
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Innovative drug-delivery systems offer a unique approach to effectively provide therapeutic drug dose over the needed time to achieve better tissue protection and enhanced recovery. The hypothesis of the current study was to test the antioxidant and anti-inflammatory effects of genistein and nanofibers on the spinal cord tissue following experimental spinal cord injury (SCI). Rats were treated post SCI with genistein that is loaded on chitosan/polyvinyl alcohol (CS/PVA) nanofibers as an implantable drug-delivery system. SCI caused marked oxidative damage and inflammation, as is evident by the reduction in the super oxide dismutase (SOD) activity and the level of interleukin-10 (IL-10) in injured spinal cord tissue, as well as the significant increase in the levels of nitric oxide (NO), malondialdehyde (MDA), and tumor necrosis factor-alpha (TNF-α). Treatment of rats post SCI with genistein and CS/PVA nanofibers improved most of the above-mentioned biochemical parameters and shifted them toward the control group values. Genistein induced an increase in the activity of SOD and the level of IL-10, while causing a decrease in NO, MDA, and TNF-α in injured spinal cord tissue. Genistein and CS/PVA nanofibers provide a novel combination for treating inflammatory nervous tissue conditions, especially when combined as an implantable drug-delivery system.
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Liu, Zhuo-Hao, Yin-Cheng Huang, Chang-Yi Kuo, Chao-Ying Kuo, Chieh-Yu Chin, Ping K. Yip, and Jyh-Ping Chen. "Docosahexaenoic Acid-Loaded Polylactic Acid Core-Shell Nanofiber Membranes for Regenerative Medicine after Spinal Cord Injury: In Vitro and In Vivo Study." International Journal of Molecular Sciences 21, no. 19 (September 24, 2020): 7031. http://dx.doi.org/10.3390/ijms21197031.
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Spinal cord injury (SCI) is associated with disability and a drastic decrease in quality of life for affected individuals. Previous studies support the idea that docosahexaenoic acid (DHA)-based pharmacological approach is a promising therapeutic strategy for the management of acute SCI. We postulated that a nanostructured material for controlled delivery of DHA at the lesion site may be well suited for this purpose. Toward this end, we prepare drug-loaded fibrous mats made of core-shell nanofibers by electrospinning, which contained a polylactic acid (PLA) shell for encapsulation of DHA within the core, for delivery of DHA in situ. In vitro study confirmed sustained DHA release from PLA/DHA core-shell nanofiber membrane (CSNM) for up to 36 days, which could significantly increase neurite outgrowth from primary cortical neurons in 3 days. This is supported by the upregulation of brain-derived neurotropic factor (BDNF) and neurotrophin-3 (NT-3) neural marker genes from qRT-PCR analysis. Most importantly, the sustained release of DHA could significantly increase the neurite outgrowth length from cortical neuron cells in 7 days when co-cultured with PLA/DHA CSNM, compared with cells cultured with 3 μM DHA. From in vivo study with a SCI model created in rats, implantation of PLA/DHA CSNM could significantly improve neurological functions revealed by behavior assessment in comparison with the control (no treatment) and the PLA CSNM groups. According to histological analysis, PLA/DHA CSNM also effectively reduced neuron loss and increased serotonergic nerve sprouting. Taken together, the PLA/DHA CSNM may provide a nanostructured drug delivery system for DHA and contribute to neuroprotection and promoting neuroplasticity change following SCI.
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Opálková Šišková, Alena, Mária Bučková, Zuzana Kroneková, Angela Kleinová, Štefan Nagy, Joanna Rydz, Andrej Opálek, Monika Sláviková, and Anita Eckstein Andicsová. "The Drug-Loaded Electrospun Poly(ε-Caprolactone) Mats for Therapeutic Application." Nanomaterials 11, no. 4 (April 4, 2021): 922. http://dx.doi.org/10.3390/nano11040922.
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Diclofenac sodium salt (DSS)-loaded electrospun nanofiber mats on the base of poly(ε-caprolactone) (PCL) were investigated as biocompatible nanofibrous mats for medical applications with the ability to inhibit bacterial infections. The paper presents the characteristics of fibrous mats made by electrospinning and determines the effect of medicament on the fiber morphology, chemical, mechanical and thermal properties, as well as wettability. PCL and DSS-loaded PCL nanofibrous mats were characterized using scanning electron microscopy, transmission electron microscopy, attenuated total reflectance-Fourier transform infrared spectrometry, dynamic mechanical analysis, and contact angle measurements. Electron paramagnetic resonance measurements confirmed the lifetime of DSS before and after application of high voltage during the electrospinning process. In vitro biocompatibility was studied, and it was proved to be of good viability with ~92% of the diploid human cells culture line composed of lung fibroblast (MRC 5) after 48 h of incubation. Moreover, the significant activity of DSS-loaded nanofibers against cancer cells, Ca Ski and HeLa, was established as well. It was shown that 12.5% (m/V) is the minimal concentration for antibacterial activity when more than 99% of Escherichia coli (Gram-negative) and 99% of Staphylococcus aureus (Gram-positive) have been exterminated.
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Diep, Emily, and Jessica D. Schiffman. "Correction: Encapsulating bacteria in alginate-based electrospun nanofibers." Biomaterials Science 10, no. 6 (2022): 1596. http://dx.doi.org/10.1039/d2bm90016e.
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Islam, Md Shahidul, Md Ashaduzzaman, Shah Md Masum, and Jeong Huyn Yeum. "Mechanical and Electrical Properties: Electrospun Alginate/Carbon Nanotube Composite Nanofiber." Dhaka University Journal of Science 60, no. 1 (April 15, 2012): 125–28. http://dx.doi.org/10.3329/dujs.v60i1.10350.
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Nanofibers of the composite of alginate (Alg) and carbon nanotube (CNT) were prepared using electrospinning method out of aqueous solutions. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), mechanical measurement, and electrical conductivity were done to characterize the Alg/CNT composite nanofibers morphology and properties. The SEM and TEM images show the CNT to be well incorporated along the nanofibers. The study shows that the introduction of CNT results in improvement in tensile strength and electrical conductivity of the Alg matrix. The electrospinning of Alg/CNT composites could potentially supply useful options for the fabrication of biomaterial scaffolds.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10350 Dhaka Univ. J. Sci. 60(1): 125-128 2012 (January)
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Fu, Kun, Yao Lu, Mahmut Dirican, Chen Chen, Meltem Yanilmaz, Quan Shi, Philip D. Bradford, and Xiangwu Zhang. "Chamber-confined silicon–carbon nanofiber composites for prolonged cycling life of Li-ion batteries." Nanoscale 6, no. 13 (2014): 7489–95. http://dx.doi.org/10.1039/c4nr00518j.
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Silicon is confined within the empty chambers of carbon nanofibers, in which the volume expansion of Si can be buffered and SEI formation is controlled. This self-supported composite is a promising electrode candidate for use in flexible batteries.
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Shen, Yi Xin, Peng Wu, Zhi Hai Fan, Feng Zhang, Zheng Feng Lu, Qi Rong Dong, and Huan Xiang Zhang. "Growth of Olfactory Ensheathing Cells on Silk Fibroin Nanofibers." Advanced Materials Research 175-176 (January 2011): 230–35. http://dx.doi.org/10.4028/www.scientific.net/amr.175-176.230.
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Objective: To evaluate the growth of olfactory ensheathing cells (OECs) on the silk fibroin (SF) nanofibers scaffold. Methods: The purified OECs were cultured with poly-L-lysine (control group) and 1200 nm SF nanofibers (experimental group). The morphological features and growth characteristics of which were analyzed by phase contrast microscopy. Nerve growth factor receptor (NGFR) p75 were applied to identify OECs by immunostaining. SEM was used to observe the adherence and spreading of OECs on different substrates. MTT assay was performed to evaluate the proliferation activity of OECs both on the control and experimental scaffolds. Results: The isolated OECs reached confluence after 4-5 days of culture, which were stained for antibody NGFRp75(+). The morphology of OECs on the 1200 nm SF nanofibers was similar to that on the control group. The SEM clearly revealed the close interaction between the OECs and the nanofbers. The OECs on SF nanofibers still maintain its original characteristic phenotypes. The MTT showed that the most obvious proliferation was reached over 10 days. The differences of OD values between 1200 nm SF and PLL were significant at day 5, 7 (p < 0.05). However, there was no significant difference at day 10. Conclusion: SF nanofibers scaffold could support the growth of OECs, and may be a promising tissue-engineered scaffold for the repair of SCI.
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Usmani, Sadaf, Audrey Franceschi Biagioni, Manuela Medelin, Denis Scaini, Raffaele Casani, Emily R. Aurand, Daniel Padro, et al. "Functional rewiring across spinal injuries via biomimetic nanofiber scaffolds." Proceedings of the National Academy of Sciences 117, no. 41 (September 30, 2020): 25212–18. http://dx.doi.org/10.1073/pnas.2005708117.
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The regrowth of severed axons is fundamental to reestablish motor control after spinal-cord injury (SCI). Ongoing efforts to promote axonal regeneration after SCI have involved multiple strategies that have been only partially successful. Our study introduces an artificial carbon-nanotube based scaffold that, once implanted in SCI rats, improves motor function recovery. Confocal microscopy analysis plus fiber tracking by magnetic resonance imaging and neurotracer labeling of long-distance corticospinal axons suggest that recovery might be partly attributable to successful crossing of the lesion site by regenerating fibers. Since manipulating SCI microenvironment properties, such as mechanical and electrical ones, may promote biological responses, we propose this artificial scaffold as a prototype to exploit the physics governing spinal regenerative plasticity.
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Xue, Jiajia, Dario Pisignano, and Younan Xia. "Electrospun Nanofibers: Maneuvering the Migration and Differentiation of Stem Cells with Electrospun Nanofibers (Adv. Sci. 15/2020)." Advanced Science 7, no. 15 (August 2020): 2070083. http://dx.doi.org/10.1002/advs.202070083.
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Liu, Pei, Teng Zhou, Linsen Yang, Congcong Zhu, Yunfei Teng, Xiang-Yu Kong, and Liping Wen. "Correction: Synergy of light and acid–base reaction in energy conversion based on cellulose nanofiber intercalated titanium carbide composite nanofluidics." Energy & Environmental Science 14, no. 10 (2021): 5572. http://dx.doi.org/10.1039/d1ee90054d.
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Correction for ‘Synergy of light and acid–base reaction in energy conversion based on cellulose nanofiber intercalated titanium carbide composite nanofluidics’ by Pei Liu et al., Energy Environ. Sci., 2021, 14, 4400–4409, DOI: 10.1039/D1EE90054D.
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Lingaraju, Dumpala, D. Suneel, and Sree Lakshmi. "Studies of mechanical properties of carbon fabric-polymer hybrid nanocomposite." Bangladesh Journal of Scientific and Industrial Research 47, no. 2 (July 28, 2012): 191–96. http://dx.doi.org/10.3329/bjsir.v47i2.11451.
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The development of nanoparticle reinforced composites is presently one of the most explored areas in materials science and engineering. Multiscale composites can be produced with superior properties by combining nanoparticles with traditional reinforcement materials. This research focuses on the development of such composites, through the use of carbon nanofibers (CNFs), carbon fibers and modified epoxy resin for structural and impact applications. Flexural and tensile behavior of composites has been analysed to investigate the effect of modification of epoxy matrix by adding CNFs on the mechanical properties of composites. Better strengths are obtained at 2.5 wt% of Epoxy terminated butadiene-acrylonitrile copolymer (ETBN) and 2 wt% of Carbon nanofibers (CNF) in the polymer hybrid nanocomposite. Morphological and fracture analysis of composites were performed by SEM DOI: http://dx.doi.org/10.3329/bjsir.v47i2.11451 Bangladesh J. Sci. Ind. Res. 47(2), 191-196, 2012
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Shin, GeunHyeong, EunAe Cho, Hyeonmuk Kang, Taehee Kim, GyuSeong Hwang, and Junho Lee. "Metal Nitrate Embedded Polymeric Interlayer for Improving Cycling Stability of Li Metal Anode." ECS Meeting Abstracts MA2022-01, no. 2 (July 7, 2022): 262. http://dx.doi.org/10.1149/ma2022-012262mtgabs.
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Among secondary batteries using lithium, the use of lithium metal anodes for high capacity has become a hot topic. However, in lithium metal anodes, there is a major problem of dendritic growth and research are actively underway to address the issue. And it is reported that it is possible to improve the stability of Li metal anode by facilitating the movement of lithium ions through various additives to suppress dendritic growth and to make robust and stable SEI layer. To address the issue of dendritic growth of Li, using cesium nitrate is selected to improve the stability of the anode based on a mechanism by which a nitrogen-rich compounds lithiophilic to transport Li ion uniformly are formed in the SEI layer. And also the cesium element induces an cation electrostatic shielding effect while lithium metal is deposited and grown in the anode. In addition, since metal nitrates have very low solubility in carbonate-based electrolytes, polymer nanofiber-interlayer is synthesized by electrospinning to support metal nitrate and supply nitrate continuously and stably, while interlayer does not interfere with the movement of lithium ions through the nanofiber layer. In summary, a metal nitrate embedded polymer nanofiber layer is synthesized through an electrospinning method, then stabilization of a lithium surface and stability of a lithium metal anode are obtained by using an intermediate layer, and a relationship between an additive and SEI formation is identified at a limited solubility in carbonate electrolytes. The study result demonstrates that the lifetime of symmetric Li-Li cells and full cell with LCO cathodes improved greatly. And the deposition morphology of Li become dendrite-free and more uniform.
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Zhang, Lan, Hui Zhong Ma, Ning Yao, and Bing Lin Zhang. "Investigation of Nano-Structured White Carbon Films." Advanced Materials Research 486 (March 2012): 44–46. http://dx.doi.org/10.4028/www.scientific.net/amr.486.44.
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White carbon films with sp1-hybridization of carbon were synthesized by microwave plasma chemical vapor deposition. The surface morphology of the deposited film, which consisted of nanograins and nanofibers, was observed by scanning electron microscope. The x-ray diffraction peak at 2θ=21.69o corresponds to the (110) facet of β modifications of white carbon material. The peak position at 283.2 eV in x-ray photoelectron spectrum represents binding energy of C1s core level of sp1-hybridization of carbon. Field electron emission properties of the film were tested by using a diode structure in a vacuum chamber. The turn-on field of 2.3V/μm and the emission current density of 360μA/cm2 at electric field of 7V/μm were obtained.
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De Cesare, Fabrizio, Elena Di Mattia, Eyal Zussman, and Antonella Macagnano. "Correction: A study on the dependence of bacteria adhesion on the polymer nanofibre diameter." Environmental Science: Nano 6, no. 4 (2019): 1267–68. http://dx.doi.org/10.1039/c9en90017a.
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Ji, Liwen, Meng Gu, Yuyan Shao, Xiaolin Li, Mark H. Engelhard, Bruce W. Arey, Wei Wang, et al. "Controlling SEI Formation on SnSb-Porous Carbon Nanofibers for Improved Na Ion Storage." Advanced Materials 26, no. 18 (February 8, 2014): 2901–8. http://dx.doi.org/10.1002/adma.201304962.
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Kuncoro, Hendrian Budi Bagus, Zulmahdi Darwis, and Amelia Rizqiyanti. "Nanofiber Cellulose Cocoa’s Hardboard on Compression Strength and Termite Resistance." Applied Research on Civil Engineering and Environment (ARCEE) 3, no. 03 (October 26, 2022): 163–73. http://dx.doi.org/10.32722/arcee.v3i03.4603.
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Each year’s use of wood needs increases, but the resulting wood production is not in proportion to meet that need. The effort is required to overcome this by using a wood substitute that includes wood-based fiberboard. The manufacture of fiberboards requires a chemical base for adhesive, which can be used to reduce the use of chemicals and thus be used in the cacao fruit’s nanofibers. Related to wood materials, the natural enemy most damaging of these materials is termites. Termites are wood-eating insects that can reduce the quality of timber, for handling this a curing process can be employed using a sourced leaf with an antifeedant. The purpose of this study is to identify the compression failure and resilience of the fiberboard termites after being given an extract of cocoa skin and soursop leaves. Dimension of compression specimens is 200 mm x 50 mm x 30, compression perpendicular is 150 mm x 50 mm x 30 mm and terminate resistence is 70 mm x 50 mm x 150 mm with hollow’s diametres 2 mm deep 1 cm. The standard that used to measure compression is SNI 03-3958-1995 and termite resistance of hardboard is SNI SNI 01-7207-2006. The extra variety used is 0%, 10%, 15%, 20% and 25%. Each variation will be done with a compression failure and termite resistance. Three different test items will be made with a total of 30 test items. Research shows compression failure parallel in strong class V wood, while compression failure perpendicular is included in the E5 quality code. Termite resistance 0%, 10% and 15% include C level damage while at 20% and 25% variation, including B damage.
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Kang, Hyeonmuk, Taehee Kim, GyuSeong Hwang, GeunHyeong Shin, Junho Lee, and EunAe Cho. "Sustained Release of AgNO3 Additive in Carbonate Electrolytes for Stable Lithium Metal Anodes." ECS Meeting Abstracts MA2022-01, no. 4 (July 7, 2022): 526. http://dx.doi.org/10.1149/ma2022-014526mtgabs.
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With increasing energy storage demand, research on high energy density and stable battery became essential. Among different anode materials for lithium batteries, lithium metal is an ideal anode material as it has low redox potential and high specific capacity. Therefore, for post-lithium ion battery with high energy density cannot avoid using lithium metal as an anode. However, lithium metal anode has stability and safety issues due to dendritic growth. Lithium metal in contact with organic electrolyte reacts with the electrolyte to form solid electrolyte interface (SEI). SEI prevents further electrolyte consumption, however presence of unstable SEI causes uneven lithium ion diffusion through the SEI layer and induces lithium dendrite growth. Therefore, uniform deposition of lithium and stable SEI is important to operate lithium metal anode safely. The application of nitrate additives in carbonate electrolyte has been very limited due to poor solubility. However, nitrate containing polymer interlayer can release additive constantly enabling nitrate act as an electrolyte additive. Herein, AgNO3 synthesized with PAN nanofibers (AgPAN) is used as an additive to induce uniform lithium deposition and stable SEI formation. In the symmetric cell test, life time of 20 µm thick lithium foil enhanced from 140 hr to 300 hr with AgPAN. Lithium nucleation overpotential disappeared and overall overpotential is reduced. Originally, plane lithium foil had the sparsely deposited dendrite shaped lithium, but with AgPAN lithium was evenly deposited and grow in spherical shape. Ag+ reduces on lithium metal surface acting as a lithium nucleation seed helping uniform lithium deposition and NO3 - reacts with lithium to form stable inorganic SEI layer (Li2O, Li3N, LiNxOy, and etc) resulting in stable cycling of lithium metal anode.
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Nakhaei, Omolfajr, Nasser Shahtahmassebi, Mahmood Rezaee Roknabadi, and Mohammad Behdani. "Fabrication and study of UV-shielding and photocatalytic performance of uniform TiO2/SiO2 core-shell nanofibers via single-nozzle co-electrospinning and interface sol–gel reaction." Scientia Iranica 23, no. 6 (October 1, 2016): 3135–44. http://dx.doi.org/10.24200/sci.2016.4018.
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Drewniak, Łukasz, and Sabina Drewniak. "The influence of the oxidation method on the properties of reduced graphene oxide." Photonics Letters of Poland 14, no. 3 (September 30, 2022): 47. http://dx.doi.org/10.4302/plp.v14i3.1154.
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Derivatives of graphene have become important materials due to their excellent properties. Graphene oxide and reduced graphene oxide are especially interesting because they are produced relatively easily, cheaply and quickly. Among many possible applications, reduced graphene oxide is a good candidate for sensor applications. Its properties can be controlled at the production stage. The precursor used and the method of oxidation have a significant influence on its properties. Therefore, it is worth take a closer look at them. In this paper we analyse the influence of the oxidation method on the size of the reduced graphene stock which determine the sensitivity of the rGO layer. We used AFM microscopy for this purpose. Full Text: PDF ReferencesS.M. Majhi, A. Mirzaei, H.W. Kim, S.S. Kim, "Reduced Graphene Oxide (rGO)-Loaded Metal-Oxide Nanofiber Gas Sensors: An Overview", Sensors 21, 4 (2021). CrossRef M. Pumera, "Graphene-based nanomaterials for energy storage", Energy Environ. Sci. 4 3 (2011). CrossRef X. Yu, H. Cheng, M. Zhang, Y. Zhao, L. Qu, G. Shi, "Graphene-based smart materials", Nat. Rev. Mater. 2, 9 (2017). CrossRef M.Y. Xia, Y. Xie, C.H. Yu, G.Y. Chen, Y.H. Li, T., Zhang, Q. Peng, "Graphene-based nanomaterials: the promising active agents for antibiotics-independent antibacterial applications", J. Control. Release 10 (2019). CrossRef X. Zhu, Y. Zhou, Y. Guo, H. Ren, C. Gao, "Nitrogen dioxide sensing based on multiple-morphology cuprous oxide mixed structures anchored on reduced graphene oxide nanosheets at room temperature", Nanotechnology 30 45 (2019). CrossRef Z. Wu, Y. Wang, S. Ying, M. Huang, C. Peng, "Fabrication of rGO/Cuprous Oxide Nanocomposites for Gas Sensing", IOP Conf. Ser.: Earth Environ. Sci. 706, 1 (2021). CrossRef S. Pei, H.M. Cheng, "The reduction of graphene oxide", Carbon 50, 9 (2012). CrossRef K. Spilarewicz-Stanek, A. Kisielewska, J. Ginter, K. Bałuszyńska, I. Piwoński, "Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles", RSC Adv. 6, 65 (2016). CrossRef R. Muzyka, S. Drewniak, T. Pustelny, M. Sajdak, Ł. Drewniak, "Characterization of Graphite Oxide and Reduced Graphene Oxide Obtained from Different Graphite Precursors and Oxidized by Different Methods Using Raman Spectroscopy Statistical Analysis", Materials 14, 4 (2021) CrossRef B. Lesiak, G. Trykowski, J. Tóth, et al. "Chemical and structural properties of reduced graphene oxide—dependence on the reducing agent", J Mater. Sci. 56 (2021). CrossRef .
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Vigani, Barbara, Silvia Rossi, Giuseppina Sandri, Maria Cristina Bonferoni, Marta Rui, Simona Collina, Francesca Fagiani, Cristina Lanni, and Franca Ferrari. "Dual-Functioning Scaffolds for the Treatment of Spinal Cord Injury: Alginate Nanofibers Loaded with the Sigma 1 Receptor (S1R) Agonist RC-33 in Chitosan Films." Marine Drugs 18, no. 1 (December 26, 2019): 21. http://dx.doi.org/10.3390/md18010021.
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The present work proposed a novel therapeutic platform with both neuroprotective and neuroregenerative potential to be used in the treatment of spinal cord injury (SCI). A dual-functioning scaffold for the delivery of the neuroprotective S1R agonist, RC-33, to be locally implanted at the site of SCI, was developed. RC-33-loaded fibers, containing alginate (ALG) and a mixture of two different grades of poly(ethylene oxide) (PEO), were prepared by electrospinning. After ionotropic cross-linking, fibers were incorporated in chitosan (CS) films to obtain a drug delivery system more flexible, easier to handle, and characterized by a controlled degradation rate. Dialysis equilibrium studies demonstrated that ALG was able to form an interaction product with the cationic RC-33 and to control RC-33 release in the physiological medium. Fibers loaded with RC-33 at the concentration corresponding to 10% of ALG maximum binding capacity were incorporated in films based on CS at two different molecular weights—low (CSL) and medium (CSM)—solubilized in acetic (AA) or glutamic (GA) acid. CSL- based scaffolds were subjected to a degradation test in order to investigate if the different CSL salification could affect the film behavior when in contact with media that mimic SCI environment. CSL AA exhibited a slower biodegradation and a good compatibility towards human neuroblastoma cell line.
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Hérou, Servann, Josh J. Bailey, Matt Kok, Philipp Schlee, Rhodri Jervis, Dan J. L. Brett, Paul R. Shearing, Maria Crespo Ribadeneyra, and Magdalena Titirici. "High‐Density Lignin‐Derived Carbon Nanofiber Supercapacitors with Enhanced Volumetric Energy Density (Adv. Sci. 17/2021)." Advanced Science 8, no. 17 (September 2021): 2170109. http://dx.doi.org/10.1002/advs.202170109.
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Hong, Jin Young, Su Hee Kim, Yoojin Seo, Jooik Jeon, Ganchimeg Davaa, Soo Hyun Kim, and Jung Keun Hyun. "Self-assembling peptide gels promote angiogenesis and functional recovery after spinal cord injury in rats." Journal of Tissue Engineering 13 (January 2022): 204173142210864. http://dx.doi.org/10.1177/20417314221086491.
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Spinal cord injury (SCI) leads to disruption of the blood–spinal cord barrier, hemorrhage, and tissue edema, which impair blood circulation and induce ischemia. Angiogenesis after SCI is an important step in the repair of damaged tissues, and the extent of angiogenesis strongly correlates with the neural regeneration. Various biomaterials have been developed to promote angiogenesis signaling pathways, and angiogenic self-assembling peptides are useful for producing diverse supramolecular structures with tunable functionality. RADA16 (Ac-RARADADARARADADA-NH2), which forms nanofiber networks under physiological conditions, is a self-assembling peptide that can provide mechanical support for tissue regeneration and reportedly has diverse roles in wound healing. In this study, we applied an injectable form of RADA16 with or without the neuropeptide substance P to the contused spinal cords of rats and examined angiogenesis within the damaged spinal cord and subsequent functional improvement. Histological and immunohistochemical analyses revealed that the inflammatory cell population in the lesion cavity was decreased, the vessel number and density around the damaged spinal cord were increased, and the levels of neurofilaments within the lesion cavity were increased in SCI rats that received RADA16 and RADA16 with substance P (rats in the RADA16/SP group). Moreover, real-time PCR analysis of damaged spinal cord tissues showed that IL-10 expression was increased and that locomotor function (as assessed by the Basso, Beattie, and Bresnahan (BBB) scale and the horizontal ladder test) was significantly improved in the RADA16/SP group compared to the control group. Our findings indicate that RADA16 modified with substance P effectively stimulates angiogenesis within the damaged spinal cord and is a candidate agent for promoting functional recovery post-SCI.
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Berim, Gersh O., and Eli Ruckenstein. "Corrigendum to “Microscopic treatment of a barrel drop on fibers and nanofibers” [J. Colloid Interface Sci. 286 (2005) 681–695]." Journal of Colloid and Interface Science 295, no. 2 (March 2006): 593. http://dx.doi.org/10.1016/j.jcis.2005.10.070.
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Cataldi, Pietro, Simeone Dussoni, Luca Ceseracciu, Marco Maggiali, Lorenzo Natale, Giorgio Metta, Athanassia Athanassiou, and Ilker S. Bayer. "Electronic Skin: Carbon Nanofiber versus Graphene-Based Stretchable Capacitive Touch Sensors for Artificial Electronic Skin (Adv. Sci. 2/2018)." Advanced Science 5, no. 2 (February 2018): 1870011. http://dx.doi.org/10.1002/advs.201870011.
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Kwon, O. Hyeon, Jang Hyeok Oh, Bobae Gu, Min Su Jo, Se Hwan Oh, Yun Chan Kang, Jae‐Kwang Kim, Sang Mun Jeong, and Jung Sang Cho. "Lithium Polymer Batteries: Porous SnO 2 /C Nanofiber Anodes and LiFePO 4 /C Nanofiber Cathodes with a Wrinkle Structure for Stretchable Lithium Polymer Batteries with High Electrochemical Performance (Adv. Sci. 17/2020)." Advanced Science 7, no. 17 (September 2020): 2070093. http://dx.doi.org/10.1002/advs.202070093.
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Khalil, Alaa Mohamed, and Andrea Iris Schäfer. "Retraction notice to “Cross-linked β-cyclodextrin nanofiber composite membrane for steroid hormone micropollutant removal from water” [J. Membr. Sci. 618 118228]." Journal of Membrane Science 658 (September 2022): 120716. http://dx.doi.org/10.1016/j.memsci.2022.120716.
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Cong, Ruye, Hyun-Ho Park, Minsang Jo, Hochun Lee, and Chang-Seop Lee. "Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries." Molecules 26, no. 16 (August 10, 2021): 4831. http://dx.doi.org/10.3390/molecules26164831.
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Silicon-carbon nanocomposite materials are widely adopted in the anode of lithium-ion batteries (LIB). However, the lithium ion (Li+) transportation is hampered due to the significant accumulation of silicon nanoparticles (Si) and the change in their volume, which leads to decreased battery performance. In an attempt to optimize the electrode structure, we report on a self-assembly synthesis of silicon nanoparticles@nitrogen-doped reduced graphene oxide/carbon nanofiber (Si@N-doped rGO/CNF) composites as potential high-performance anodes for LIB through electrostatic attraction. A large number of vacancies or defects on the graphite plane are generated by N atoms, thus providing transmission channels for Li+ and improving the conductivity of the electrode. CNF can maintain the stability of the electrode structure and prevent Si from falling off the electrode. The three-dimensional composite structure of Si, N-doped rGO, and CNF can effectively buffer the volume changes of Si, form a stable solid electrolyte interface (SEI), and shorten the transmission distance of Li+ and the electrons, while also providing high conductivity and mechanical stability to the electrode. The Si@N-doped rGO/CNF electrode outperforms the Si@N-doped rGO and Si/rGO/CNF electrodes in cycle performance and rate capability, with a reversible specific capacity reaching 1276.8 mAh/g after 100 cycles and a Coulomb efficiency of 99%.
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Lomov, Stepan V., Sunny Wicks, Larissa Gorbatikh, Ignaas Verpoest, and Brian L. Wardle. "Corrigendum to “Compressibility of nanofibre-grafted alumina fabric and yarns: Aligned carbon nanotube forests” Compos. Sci. Technol. 90 (2014) 57–66." Composites Science and Technology 131 (August 2016): 88. http://dx.doi.org/10.1016/j.compscitech.2016.05.011.
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Ariamoghaddam, Amir reza, Bahman Ebrahimi-Hosseinzadeh, Ashrafalsadat Hatamian-Zarmi, and Razi Sahraeian. "Corrigendum to “In vivo anti-obesity efficacy of curcumin loaded nanofibers transdermal patches in high-fat diet induced obese rats” [Mater. Sci. Eng. C 92 (2018) 161–171]." Materials Science and Engineering: C 106 (January 2020): 110149. http://dx.doi.org/10.1016/j.msec.2019.110149.
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Amraoui, Mounira, Chouaib Daoudi, and Mohamed Remram. "Preparation and Characterization of Silver Nanospheroids: Theoretical and Experimental Approaches." Photonics Letters of Poland 9, no. 2 (July 1, 2017): 63. http://dx.doi.org/10.4302/plp.v9i2.683.
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We synthesized silver nanoparticles of different sizes and forms as function of the molar masses of AgNO3, in two different solvent mediums (ethanol, methanol). We carried out the synthesis according to standard chemical route with major modifications. The spectroscopic characterization showed the presence of two distinct absorption bands; the first band at 300 nm and the second shifted to 440 nm. We found a multipolar phenomenon depending on the temperature. The shape and size predicted by the numerical model are conform to the experimental results. The study demonstrated that the nanoparticles have a spheroidal shape. Full Text: PDF ReferencesCecilia Noguez, "Surface Plasmons on Metal Nanoparticles: The Influence of Shape and Physical Environment", J. Phys. Chem. C 111(10), 3806 (2007). CrossRef M. Amraoui , C. Daoudi and M. Remram, Int.Sc.Sci and Tech. Conf. 2015 Ayd?n,Turkey , 11-13 May , 2015 (ISSTC 2015).M. I Gonzalez-Sanchez et al, "Silver nanoparticle based antibacterial methacrylate hydrogels potential for bone graft applications", Mater. Sci. Eng C. Mater. Biol. Appl 50, 332 (2015). CrossRef Xinyi Dong et al, "Shape Control of Silver Nanoparticles by Stepwise Citrate Reduction", J. Phys. Chem. C 113(16), 6573 (2009). CrossRef A. Wolak, M. Grabiec, O. Véron, J. ?P. Blondeau and K. Dzierżęga, "Nanosecond infrared laser-induced precipitation of silver nanoparticles in glass", Phot. Lett. Poland 5(2), 54 (2013). CrossRef A. Zielinska, E. Skwarek, A. Zaleska, M. Gazda and J. Hupka, "Preparation of silver nanoparticles with controlled particle size", Procedia Chemistry 1, 1560 (2009). CrossRef K-S.Chou, Y.Chang and L. Hua, "Studies on the Continuous Precipitation of Silver Nanoparticles", Ind.Eng.Chem.Res 51(13) 4905 (2012). CrossRef A. M. Atta, H. A. Al-Lohedan, A. O. Ezzat, "Synthesis of Silver Nanoparticles by Green Method Stabilized to Synthetic Human Stomach Fluid", Molecules 19(5) 6737 (2014). CrossRef Botasini, S, Méndez, E. "Silver nanoparticle aggregation not triggered by an ionic strength mechanism", J Nanopart Res 15, 1526 (2013). CrossRef V. Amendola, O.M. Bakr, F. Stellacci, "A Study of the Surface Plasmon Resonance of Silver Nanoparticles by the Discrete Dipole Approximation Method: Effect of Shape, Size, Structure, and Assembly", Plasmonics 5(1) 85 (2010). CrossRef L. Jeong, W. Ho Park "Preparation and Characterization of Gelatin Nanofibers Containing Silver Nanoparticles", Int. J. Mol. Sci 15, 6857 (2014). CrossRef Peter Monk, Finite element method for Maxwell's equations, (Oxford, Clarendon Press 2003). DirectLinkM.D. Abramoff, P.J. Magalhaes, S.J. Ram, "Image processing with ImageJ", Biophotonics International 11(7), 36 (2004). DirectLink Edward D.Palik, Handbook of optical constants of solids (California, Academic Press Inc, 1985). DirectLink
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Honda, Shiho, Masanori Hara, and Masamichi Yoshimura. "(Digital Presentation) Fabrication of Conductive Carbon Composite Films for Freestanding Lib Anodes Using Cellulose Nanofiber Binder." ECS Meeting Abstracts MA2022-01, no. 2 (July 7, 2022): 402. http://dx.doi.org/10.1149/ma2022-012402mtgabs.
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Fig.1 Cycle performance and Coulomb efficiency of graphite/CNT/CNF composite electrodes Introduction Currently, lithium-ion batteries (LIBs) have been the primary power source for electric vehicles and portable devices. LIBs consist of anodes (e.g. graphite), cathodes (e.g. LiCoO2: LCO), and electrolytes,[1] and are dis-/ charged as Li+ de-/ intercalate between the electrodes. Since LIBs require expensive fluorinated polymer as binders (e.g. poly (vinylidene fluoride): PVDF) and a volatile and toxic organic solvent such as N-methyl pyrrolidone (NMP), cheaper and easier-to-handle materials are necessary. Furthermore, the metal substrates (Cu, Al foil, etc.) as the current collectors are heavy and reduce the weight energy density of electrodes. Therefore, providing alternatives to the conventional components of LIB electrodes is a key challenge. Developing functional nanocomposites using sustainable natural resources is one of the most importance strategies.[2] Conductive thin films of cellulose nanofibers (CNFs) combined with carbon nanotubes (CNTs) have been reported as novel carbon composites.[3] Environmentally friendly and only carbonaceous electrodes without PVDF and organic solvents, and graphite are normally used for anodes. As an allotrope of graphite, CNTs have been approved to be a suitable anode material due to their unique structure (one-dimensional cylindrical tubule of graphite sheet), high conductivity (106 Sm-1 at 300 K), low density, high rigidity (Young’s modulus 1 TPa), and high tensile strength (up to 60 GPa).[4] In this study, the free-standing carbon composite anodes were successfully fabricated by using ultrasonication of CNF/ CNT or graphite mixture and vacuum filtering. Graphite slurry as the active material layer was dispersed in DI-water as the solvent containing CNF binder. This composite film has a dual-layer structure consisting of graphite/CNF active materials layer and CNT/CNF layer; here, the CNT/CNF layer with a thickness of about 10 μm is utilized as a current collector replacing the conventional metal substrate. These fabricated electrodes were evaluated by structural evaluation and dis-/ charge measurements. Experimental method CNF gel (2 wt%, Rheocrysta, DKS Co. Ltd.) and functionalized (carboxylic acid) multi-walled CNT (f-MWCNT, Sigma-Aldrich) were suspended in DI-water and sonicated for 2 h. Synthetic graphite was dispersed in DI-water with 5 wt% CNF and 10 wt% Carbon Black (CB) as a conductive material and sonicated for 30 min. Nanocomposite dual-layer films were formed by vacuum-filtering the dispersion using PVDF (pore size: 0.1 μm) membrane filters. These films were characterized by scanning electron microscope (SEM), atomic force microscope (AFM), and Raman spectroscopy. The conductivity was measured by four probe method. The electrochemical properties of the free-standing electrode were measured using coin cells at room temperature. The coin cells were assembled in an argon-filled glovebox using Li as a counter electrode, glass fiber filter as a separator, and 1 M LiPF6 in a 1:1 (volume) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte. Charge-discharge characteristics were recorded from 0.01 to 3 V at charging speeds of 0.1 – 2 C. The electrochemical impedance spectra (EIS) were measured in the frequency range from 100 mHz to 100 kHz with a potential perturbation at 5 mV. Results CNF combined with CNT constructs a robust conductive fibrous network, and CNT linked with graphite builds electronic conductive paths to improve the electronic conductivity. Specific capacities of the electrode were 44 mAhg-1 at 2 C and 272 mAhg-1 at 0.5 C, respectively (Fig.1). The discharge capacity of the first cycle was 363 mAhg-1 at 0.1 C. After 125 cycles, the discharge capacity was 255 mAhg-1 at 0.5 C. The ratio of the charge and discharge capacities (Coulombic efficiency) suggests that the charge-discharge behavior is stable in the cycle measurement, indicating that the irreversible capacity was small. Other information obtained by cyclic voltammetry (CV), and EIS measurement and further results will be shown in the presentation. In summary, we successfully fabricated the graphite/CNT/CNF composite film as environmentally friendly and lightweight anodes for the first time. The present results indicate that graphite/CNT/CNF composite film is a good candidate of flexible free-standing anodes. This research focused on CNFs as a promising alternative to conventional battery materials, and CNFs were successfully used to fabricate electrodes without using expensive PVDF binders and toxic organic solvents. Moreover, the gravimetric energy density was improved by replacing the conventional heavy Cu foil with a lightweight and thin composite film of CNT/CNF. References [1] M. Weiss, et al., Adv. Energy Mater. 2021, 11, 2101126. [2] C. Chen, et al., Comp. Sci. and Technol. 2018, 156, 103-108. [3] S. Cao, et al., ACS Appl. Mater. Interfaces 2015, 7, 10695-10701. [4] C. de las Casas, et al., J. Power Sources 2012, 208, 74-85. Figure 1
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Henkensmeier, Dirk. "(Invited, Digital Presentation) Polybenzimidazole and Its Use in Energy Storage and Conversion." ECS Meeting Abstracts MA2022-01, no. 38 (July 7, 2022): 1708. http://dx.doi.org/10.1149/ma2022-01381708mtgabs.
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Polybenzimidazole (PBI) is a unique polymer. It has high mechanical strength and stability, and is not conductive. However, in contact with acids, the imidazole rings are protonated, and PBI becomes proton conductive. In contact with alkaline solutions, the amine groups are deprotonated, and PBI becomes hydroxide conductive. Control of the doping process allows to adjust the uptake and hence allows to control conductivity and permeability of PBI membranes. Therefore, PBI can be used in various ways for several applications. Phosphoric acid doped PBI blends were tested in the HT PEMFC, and showed more than >2000 hours stable, high performance operation at very challenging high current density of 800 mA/cm2 (one of world-best results).[1] Sulfuric acid doped PBI membranes were developed for use in the vanadium redox flow battery. We show that stable performances with an energy efficiency >91% and coulomb efficiency >99% @ 80 mA/cm2 can be achieved, which is one of the highest reported performances.[2, 3] By using a newly developed membrane fabrication process, hydroxide conducting membranes with a conductivity of > 310 mS/cm2 were be obtained. Porous supports enhanced the mechanical stability of these membranes, and PEM-water electrolyser-like performance was achieved in an alkaline water electrolyser, which was successfully operated for 1000 hours without failure.[4] A common way to increase the mechanical stability of membranes is reinforcement with a porous support. The drawback is that different swelling ratios of matrix and support can form voids, which results in unacceptably high gas crossover in electrolyzers and fuel cells. To tackle this issue, we pore filled an electrospun PBI fiber mat with a bomoalkylated polymer and reacted it with the imidazole groups available on the PBI fiber surface, thus forming a covalently bonded interface. In a final step, the remaining bromoalkyl groups were quaternized. The membrane was tested for 200 hours in an electrolyzer, and showed no signs of degradation. [5] [1] N. Nambi Krishnan, N.M.H. Duong, A. Konovalova, J.H. Jang, H.S. Park, H.J. Kim, A. Roznowska, A. Michalak, D. Henkensmeier, Polybenzimidazole / tetrazole-modified poly(arylene ether) blend membranes for high temperature proton exchange membrane fuel cells, J. Membr. Sci., 2020, 614, 118494. https://doi.org/10.1016/j.memsci.2020.118494 [2] C. Noh, D. Serhiichuk, M. Najibah, Y. Kwon, D. Henkensmeier, Optimizing the performance of meta-polybenzimidazole membranes in vanadium redox flow batteries by adding an alkaline pre-swelling step, Chem. Eng, J., 405 (2021) 126574. https://doi.org/10.1016/j.cej.2020.126574 [3] unpublished results [4] under review [5] Malikah Najibah, E. Tsoy, H. Khalid, Y. Chen, Q. Li, C. Bae, J. Hnát, M. Plevová, K. Bouzek, J.H. Jang, H.S. Park, Dirk Henkensmeier, PBI nanofiber mat-reinforced anion exchange membranes with covalently linked interfaces for use in water electrolysers, J. Membr. Sci., 2021, 640, 119832. https://doi.org/10.1016/j.memsci.2021.119832
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Azam, Sakibul, and Ruigang Wang. "Novel Adsorption-Catalysis Design of CuO Impregnated CeO2 Nanorods As Cathode Modifier for Lithium-Sulfur Battery." ECS Meeting Abstracts MA2022-02, no. 2 (October 9, 2022): 133. http://dx.doi.org/10.1149/ma2022-022133mtgabs.
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Lithium sulfur batteries (LSBs) are a promising candidate to be used in modern commodities like electric vehicles, grid energy storage, electric aviation, and many others because of the exceptionally high theoretical capacity of sulfur (1675 mAh g-1), almost 5 times higher than the conventional lithium-ion batteries. However, the problem of polysulfide shuttling effect originating from the dissolved lithium polysulfides in the electrolyte results in poor cycling stability, hindering the commercialization of LSB. Significant advancement has been made over the years due to a great deal of research on novel materials development and structural design for lithium polysulfide (Li2Sn: 4≤ n ≤8) adsorption synergy to counter the polysulfide shuttling effect 1. However, rather than focusing only on the adsorption synergy (Physical confinement and chemical binding), novel catalysts that can accelerate the polysulfide conversion reaction kinetics are needed to design the next generation LSB. Previously, our group investigated shape-controlled cerium oxide (CeO2) to accelerate the polysulfide conversion reactions by generating the intermediate steps of thiosulfate and polythionate 2, 3. Copper oxide (CuO), being a p-type semiconducting material, is another promising material that can activate thiosulfate formation as its redox potential is 2.53 V vs Li/Li+, which lies in the potential window of 2.4 V < E° ≤ 3.05 V that selectively triggers the formation of thiosulfate. Herein, we investigated 10 wt% of CuO impregnated on the CeO2 nanorods (10 wt%CuO/CeO2) as a cathode host for LSB. The CuO impregnation on the surface of CeO2 nanorods attributed strong interaction between the surface defect rich CeO2 nanorods and the copper oxides (CuOx: Cu2O and CuO) promoting excellent electrocatalytic activity. The 10 wt%CuO/CeO2 sample provides adsorption-catalysis dual synergy to chemically bind and further catalyze the polysulfide conversion by polythionate and thiosulfate generation. As a result, the derived LSB exhibited excellent electrochemical performance with high capacity of 1141 mAh g-1 at 0.2 C with a sulfur loading of 1.33 mg cm-2 and a capacity loss of only 0.04% per cycle after 60 cycles. Key words: lithium sulfur batteries, lithium polysulfides, shuttle effect, cerium oxide, catalysis. Xiong, D. G.; Zhang, Z.; Huang, X. Y.; Huang, Y.; Yu, J.; Cai, J. X.; Yang, Z. Y., Boosting the polysulfide confinement in B/N–codoped hierarchically porous carbon nanosheets via Lewis acid–base interaction for stable Li–S batteries. Journal of Energy Chemistry 2020, 51, 90-100. Azam, S.; Wei, Z.; Wang, R., Cerium oxide nanorods anchored on carbon nanofibers derived from cellulose paper as effective interlayer for lithium sulfur battery. J Colloid Interface Sci 2022, 615, 417-431. Wei, Z.; Li, J.; Wang, R., Surface engineered polar CeO2-based cathode host materials for immobilizing lithium polysulfides in High-performance Li-S batteries. Applied Surface Science 2022, 580.
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Nishihara, Hirotomo. "(Invited) Graphenemesosponge: A New Carbon Material with High Porosity and High Durability for Battery Applications." ECS Meeting Abstracts MA2022-01, no. 10 (July 7, 2022): 782. http://dx.doi.org/10.1149/ma2022-0110782mtgabs.
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There are many kinds of carbon materials such as activated carbons, nanoporous carbons, carbon blacks, graphite, carbon nanotubes, carbon nanofibers, and graphene-like materials, and they have been used in a variety of batteries as active materials, conductive additives, and gas diffusion layers. Depending on the purpose of use, carbon materials are required to have appropriate porosity, electric conductivity, mechanical stability, and electrochemical stability. While the above mentioned carbon materials have individual advantages and disadvantages, it has been a challenging target to develop next-generation carbon materials to satisfy all the necessary requirements at the same time. In this talk, a new class of carbon material, “graphene mesosponge (GMS)”, is introduced as a feasible candidate [1]. GMS is synthesized by a hard-templating method using Al2O3 [1] or MgO [2] nanoparticles via precisely controlled chemical-vapor deposition in which the average stacking number of graphene sheets is adjusted to 1. After template removal, the resulting mesoporous carbon is annealed at 1800 °C to form GMS. By such a high-temperature treatment, most of carbon edge sites which cause corrosion of batteries can be removed, and GMS exhibits ultra-high stability against chemical oxidation as well as electrochemical oxidation. Despite such durability, GMS possess a high surface area (ca. 2000 m2/g) and a large pore volume (> 3 cm3/g). Moreover, GMS has a high electric conductivity which is superior to carbon blacks. Furthermore, GMS is mechanically flexible and tough. GMS shows reversible deformation and recovery upon applying mechanical force and its removal [3]. Such unique properties of GMS enable its use as next-generation durable and high-performance carbon material to battery applications. As an electrode material for electric double-layer capacitors, GMS exhibits ultra-high voltage stability up to 4.4 V even in a conventional organic electrolyte (Et3MeN/BF4), which surpass single-walled carbon nanotubes [4]. Also, GMS is useful to a Pt support of polymer-electrolyte fuel cells [5] and to a cathode of Li-air batteries. References [1] H. Nishihara, T. Simura, S. Kobayashi, K. Nomura, R. Berenguer, M. Ito, M. Uchimura, H. Iden, K. Arihara, A. Ohma, Y. Hayasaka, T. Kyotani, Adv. Funct. Mater. 2016, 26, 6418-6427. [2] S. Sunahiro, K. Nomura, S. Goto, K. Kanamaru, R. Tang, M. Yamamoto, T. Yoshii, J. N. Kondo, Q. Zhao, A. Ghulam Nabi, R. Crespo-Otero, D. Di Tommaso, T. Kyotani, H. Nishihara, J. Mater. Chem. A 2021, 9, 14296-14308. [3] K. Nomura, H. Nishihara, M. Yamamoto, A. Gabe, M. Ito, M. Uchimura, Y. Nishina, H. Tanaka, M. T. Miyahara, T. Kyotani, Nat. Commun. 2019, 10, 2559. [4] K. Nomura, H. Nishihara, N. Kobayashi, T. Asada, T. Kyotani, Energy Environ. Sci. 2019, 12, 1542-1549. [5] A. Ohma, Y. Furuya, T. Mashio, M. Ito, K. Nomura, T. Nagao, H. Nishihara, H. Jinnai, T. Kyotani, Electrochim. Acta 2021, 370, 137705.
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Liu, Shaoqing, Ehsan Shahini, Minrui Gao, Lu Gong, Pengfei Sui, Tian Tang, Hongbo Zeng, and Jingli Luo. "Tailoring a Three-Phase Microenvironment for High-Performance CO2 Electroreduction." ECS Meeting Abstracts MA2022-01, no. 39 (July 7, 2022): 1770. http://dx.doi.org/10.1149/ma2022-01391770mtgabs.
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Modern industrialization is accompanied with the extensive usage of fossil fuels for energy demands and consequently, an excessive emission of CO2 into the atmosphere. To combat the injurious greenhouse effects, the CO2 electroreduction (CER) to feedstocks and fuels becomes an appealing approach to reducing CO2 emission and simultaneously producing useful products. It is generally recognized that the solid-catalyst/liquid-electrolyte/gaseous-CO2 triple-phase boundary is the key microstructure feature of CER, where CO2 molecules react with protons (H+) and e− and are reduced. Besides the intrinsic activity of catalyst itself and the accessibility of active sites, CER performance also strongly depends on the transport of H+ and CO2 molecules through electrolyte to catalyst surface. Apparently, the availability of H+ in aqueous solution can be readily achieved via H2O ionization, while the low solubility of CO2 limits the supply of CO2 to the catalyst surface. Moreover, previous study has demonstrated that complete depletion of CO2 on the catalyst surface can even occur when high overpotential is applied.1 In this regard, rationally designing the structure of catalyst to increase the concentration of CO2 at the triple-phase boundary is immensely significant for CER since this could overcome the limited diffusion of CO2 in aqueous medium. Recently, surface hydrophobicity engineering has been proved to be a wise tactic to increase the local CO2 concentration by trapping CO2 near the catalyst surface, thus improving CO2 electrolysis. For example, modification of the hydrophobic organics on catalyst surface could create triple-phase boundary and increase CO2 concentration on catalyst surface, these improved CER performance and simultaneously inhibited HER.2 Unfortunately, the insulative organics coated on the catalyst surface will sacrifice its activity, while some small pieces of organics may desorb from the surface or in the case of flow cell, these pieces can be flushed away by the fluid. Since most catalysts are in situ grown on carbon support with the advantages of rapid electron transfer and seamless contact,3, 4 it is possible to tailor the microenvironment around the catalyst through chemical modification of carbon support. For example, platinum-based catalysts supported on hydrophobic carbon with a desirable microenvironment display a state-of-the-art catalytic activity for oxygen reduction reaction.5 However, few studies have been conducted to investigate how the carbon support can be modified to create a favourable triple-phase boundary for CER. In this study, we have in situ grown Bi2O3 nanosheets (NSs) on two types of carbon materials, hydrophobic carbon nanofiber (Bi2O3@C/HB) and hydrophilic carbon nanofiber (Bi2O3@C/HL), respectively, and used them as the cathode catalysts for CER. Compared to Bi2O3@C/HL, the as-obtained Bi2O3@C/HB exhibits significantly boosted CER performances for formate formation with the high FEformate of ˃ 93% over an extremely wide potential window of 1000 mV, high formate partial current density (jformate ) of 102.1 mA cm−2 and high formate formation rate of 1905 μmol h−1 cm−2. Molecular dynamics (MD) simulations together with electrochemical measurements reveal that the hydrophobic carbon support can create a hydrophobic microenvironment by avoiding the formation of hydrogen bond. This increases the local CO2 concentration and pH, both contributing to the enhancement of the overall CER. We believe that the findings from this work can provide significant guidelines for designing highly active CER catalysts and showcase a promising approach to improving other types of electrolysis involving gas phase. Raciti, D.; Mao, M.; Park, J. H.; Wang, C., Mass transfer effects in CO2 reduction on Cu nanowire electrocatalysts. Catal. Sci. Technol. 2018, 8, 2364-2369. Wang, J.; Cheng, T.; Fenwick, A. Q.; Baroud, T. N.; Rosas-Hernández, A.; Ko, J. H.; Gan, Q.; Goddard Iii, W. A.; Grubbs, R. H., Selective CO2 Electrochemical Reduction Enabled by a Tricomponent Copolymer Modifier on a Copper Surface. J. Am. Chem. Soc. 2021, 143, 2857-2865. Liu, S.; Lu, X. F.; Xiao, J.; Wang, X.; Lou, X. W., Bi2O3 nanosheets grown on multi‐channel carbon matrix to catalyze efficient CO2 electroreduction to HCOOH. Angew. Chem., Int. Ed. 2019, 58, 13828-13833. Li, F.; Chen, L.; Knowles, G. P.; MacFarlane, D. R.; Zhang, J., Hierarchical mesoporous SnO2 nanosheets on carbon cloth: a robust and flexible electrocatalyst for CO2 reduction with high efficiency and selectivity. Angew. Chem., Int. Ed. 2017, 56, 505-509. Zhao, Z.; Hossain, M. D.; Xu, C.; Lu, Z.; Liu, Y.-S.; Hsieh, S.-H.; Lee, I.; Gao, W.; Yang, J.; Merinov, B. V., Tailoring a Three-Phase Microenvironment for High-Performance Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cells. Matter 2020, 3, 1774-1790.
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Pashazadeh, Sara, Biuck Habibi, Ali Pashazadeh, Ali Fatemi, and Milad Rasouli. "(Digital Presentation) Facile Fabrication of Graphene Quantum Dot- Doped Polyaniline Embedded Cu Metal-Organic Frameworks Composite Electrode As Improved Anode Electrocatalyst for Methanol Oxidation." ECS Meeting Abstracts MA2022-01, no. 41 (July 7, 2022): 2491. http://dx.doi.org/10.1149/ma2022-01412491mtgabs.
Full textAbstract:
Nonrenewable energy sources accounted for roughly 80% of total energy consumption [1]. Solar energy, wind energy, geothermal energy, hydropower, and fuel cells (FCs) have all recently been described as renewable energy sources. In commercial uses, renewable energy has experienced meteorological and logistical obstacles. Because of advantages such as simple fabrication/operation conditions, eco-friendly, high energy conversion efficiency, and long-term durability, FCs technologies are considered one of the most important renewable energy sources for many applications such as portable devices, cars, and electricity plants [2–5]. Methanol can be utilized in direct methanol fuel cells (DMFC) to produce clean energy that can be used in smart electronic gadgets or small automobiles in this regard [6]. However, before DMFC can be used commercially, the slow oxidation kinetics and catalyst toxicity [7] must be resolved. Therefore, the development of direct methanol fuel cells (DMFCs) is one of the most promising technologies for the applications of these devices in stationary power supplies and electric vehicles [8]. Apart from the future of mobile devices such as mobile chargers, phones, computers, and many other applications, this energy is environmentally benign because no gases are emitted and the waste is simply clean water. The biggest issue that this technique may encounter is its high cost due to the usage of noble metal catalysts (platinum (Pt) and ruthenium (Ru)) [9]. Methanol is oxidized via a multi-electron process and several products and/or intermediates can be formed, depending on the electrolyte and the nature of the electrode. Electrode materials are important parameters in the electrochemical oxidation of methanol, where high efficient electrocatalysts are needed. Several metal oxides such as Fe2O3, CeO2, MoOx, Co3O4, NiO, and CuO has been used in various applications, such as catalysis, water splitting photocatalysis, solar cells and gas sensing, besides their uses to enhance the electrocatalytic activity for methanol oxidation [10-11]. This paper describes the preparation of graphene quantum dot-doped polyaniline embedded copper metal-organic frameworks composite catalysts for investigating methanol oxidation in alkaline solutions. The electrode surface was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and electrochemical impedance spectroscopy (EIS). After physicochemical characterizations of graphene quantum dot-doped polyaniline embedded copper metal-organic frameworks composite modified carbon ceramic electrode (Cu- MOF/GQDs-PAN/CCE), its electrocatalytic and stability characterizations toward methanol oxidation in alkaline media were investigated in detail by cyclic voltammetry and chronoamperometry. Results showed that, the electrocatalytic activity of the Cu- MOF/GQDs-PAN/CCE electrode is much higher than those of unmodified electrode under similar experimental conditions, showing the possibility of attaining good electrocatalytic anodes for fuel cells. Kinetic parameters such as the electron transfer coefficient (α) and the number of electrons involved in the rate determining step (nα) for the oxidation of methanol were determined utilizing cyclic voltammetry (CV). Keywords: Graphene quantum dot, Polyaniline, Metal-organic frameworks, electrocatalyst, Methanol References [1] S.K. Kamarudin, F. Ahmad, W.R.W. Daud, Overview on application of direct methanol fuel cell (DMFC) for portable electronic devices, Int. J. Hydrog. Energy 34 (2009) 6902–6916. [2] L. Carrette, K.A. Friedrich, U. Stimming, Fuel cells: principles, types, fuels and applications, ChemPhysChem 1 (2000) 162–193. [3] A.B. Stambouli, Fuel cells: The expectations for an environmental-friendly and sustainable source of energy, Renew. Sustain. Energy Rev. 15 (9) (2011) 4507– 4520. [4] P. Joghee, J.N. Malik, S. Pylypenko, R. O’Hayre, A review on direct methanol fuel cells – In the perspective of energy and sustainability, MRS Energy Sustain. 2 (2015), https://doi.org/10.1557/mre.2015.4. [5] D. Hassen, M.A. Shenashen, S.A. El-Safty, M.M. Selim, H. Isago, A. Elmarakbi, H. Yamaguchi, Nitrogen-doped carbon-embedded TiO2 nanofibers as promising oxygen reduction reaction electrocatalysts, J. Power Sources 330 (2016) 292– 303. [6] M. Mansor, S.N. Timmiati, K.L. Lim, W.Y. Wong, S.K. Kamarudin, N.H. Nazirah Kamarudin, Recent progress of anode catalysts and their support materials for methanol electrooxidation reaction, Int. J. Hydrogen Energy 44 (29) (2019) 14744–14769, https://doi.org/10.1016/j.ijhydene.2019.04.100. [7] Z. Mousavi, A. Benvidi, S. Jahanbani, M. Mazloum-Ardakani, R. Vafazadeh, H. R. Zare, Investigation of electrochemical oxidation of methanol at a carbon paste electrode modified with Ni(II)-BS complex and reduced graphene oxide nano sheets, Electroanalysis 28 (12) (2016) 2985–2992, https://doi.org/10.1002/ elan.201501183. [8] S. Wasmus, A. Küver, Methanol oxidation and direct methanol fuel cells: a selective review, J. Electroanal. Chem. 461 (1-2) (1999) 14–31. [9] M. Liu, R. Zhang, W. Chen, Graphene-Supported Nanoelectrocatalysts for Fuel Cells: Synthesis, Properties, and Applications, Chem. Rev. 114 (2014) 5117– 5160. [10] N. Spinner, W.E. Mustain, Electrochim. Acta 56 (2011) 5656. [11] M.S. Risbud, S. Baxter, M. Skyllas-Kazacos, Open Fuels Energy Sci. J. 5 (2012) 9.
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Yan, Caihong, Enshan Han, Yanzhen He, and Shun Lu. "Vanadium Doped Nickel Sulfide@ Nickel Foam Electrode for Hybrid Supercapacitors." ECS Meeting Abstracts MA2022-02, no. 7 (October 9, 2022): 2570. http://dx.doi.org/10.1149/ma2022-0272570mtgabs.
Full textAbstract:
Abstract With the depletion of energy sources, people are gradually deepening the development of new energy sources. However, energy storage devices are limiting the pace of the development of new energy sources.[1] Considering the potential of supercapacitors as a supplement or alternative to rechargeable batteries for fast energy harvesting and high power transfer has become a research focus recently. Hybrid supercapacitors (HSCs) can bridge the gap between supercapacitors and batteries. It is well known that the main components of HSC devices are anode and cathode. The anode mainly provides high electrochemical performance, while the cathode can supply a wide potential window and good stability.[2] The energy density calculation equation (E = 0.5 CV2 ) is known and deduced that can control the energy density of HSC by the operating voltage window (V) and specific capacitance (C). Obviously, constructing anode materials with high capacitance is one of the effective ways to achieve the high energy density of HSC. In addition, previous experimental results show that reasonable ion doping is beneficial to change the electronic structure of electrode materials and improving the energy storage performance of electrode materials.[3-5] One of the elements with more than one oxidation state can form two (or more) ions of different valence states under the action of a reducing agent, which will be called mixed-valence ions. Boosting the specific capacitance of the electrode, ions with mixed-valence states have higher charge storage capacity and more abundant redox reactions than most other transition metal ions. In this regard, vanadium has various stable oxidation states (+ 2, + 3, + 4, and + 5). In particular, its high oxidation states (+ 4 and + 5) can store charge in the positive potential range, thus providing a favorable pseudo-capacitance. Here, we chose Ni3S2 with high theoretical capacitance and prepared vanadium-doped nickel sulfide (V-Ni3S2, denoted as VNS) anode electrodes using vanadium ions as dopant ions (Figure 1). Using nickel foam as the nickel source, prepared the VNS electrode by a one-step hydrothermal method. Since the electrode is grown in situ on the surface of nickel foam, the electrode material can be employed as an electrode sheet directly after preparation without further fabrication. Figure 1. Schematic diagram of synthesis process of VNS electrode, and Electrochemical storage performance: (a) CV curves of the VNS and NS electrodes at 2 mV s-1 scan rate, (b) GCD curves of the VNS and NS electrodes at 1 A g-1, (c) GCD curves of VNS with different V doping amounts at 1 A g-1, (d) The Ragone plots, (e) Self-discharge of NS//AC device and VNS//AC device for five hours, and (f) Cycle performance of the VNS//AC hybrid supercapacitor with a voltage of 1.6 V at a current density of 2 A g-1. [6] The most direct effect of avoiding the use of binder and thus increasing the conductivity is that the specific capacitance of the prepared VNS electrodes is further enhanced (2072 F g− 1 at 1 A g− 1). In addition, the structure of the surface of the prepared VNS electrode material is nanoflower morphology. Integrating two-dimensional nanosheets into three-dimensional nanoflower morphologies increases the number of active sites while improving the structural stability (capacitance retention of 86.4% after 10,000 cycles, Figure 1a-f). Finally, using the VNS and activated carbon electrodes as anode and cathode to assemble the VNS//AC hybrid supercapacitors delivers an excellent energy density of 81.33 Wh kg− 1 at a power density of 160 W kg− 1. This simple preparation method and significantly enhanced performance of the electrode materials have far-reaching potential for application in HSC devices. References [1] C. Li et al. MOF-derived NiZnCo-P nano-array for asymmetric supercapacitor, Chem. Eng. J. 446 (2022) 137108. [2] K. Tao et al. Epitaxial grown self-supporting NiSe/Ni3S2/Ni12P5 vertical nanofiber arrays on Ni foam for high performance supercapacitor: Matched exposed facets and re-distribution of electron density, Nano Energy, 55 (2019) 65-81. [3] G. Li et al. One-pot synthesis of Cu-doped Ni3S2 nano-sheet/rod nanoarray for high performance supercapacitors, Chem. Eng. J. 388 (2020) 124319. [4] Y. Ruan et al. Al-doped β-NiS Mesoporous Nanoflowers for Hybrid-type Electrodes toward Enhanced Electrochemical Performance, Electrochim. Acta, 236 (2017) 307-318. [5] Y. Cheng et al. A novel electrode for supercapacitors: Spicules-like Ni3S2 shell grown on molybdenum nanoparticles doped nickel foam, Appl. Surf. Sci. 467-468 (2019) 1113-1121. [6] C. Yan et al. Hydrothermal synthesis of vanadium doped nickel sulfide nanoflower for high-performance supercapacitor, J. Alloy. Compd. (2022) 167189. Figure 1
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Moś, Joanna Ewa, Karol Antoni Stasiewicz, and Leszek Roman Jaroszewicz. "Liquid crystal cell with a tapered optical fiber as an active element to optical applications." Photonics Letters of Poland 11, no. 1 (April 3, 2019): 13. http://dx.doi.org/10.4302/plp.v11i1.879.
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The work describes the technology of a liquid crystal cell with a tapered optical fiber as an element providing light. The tapered optical fiber with the total optical loss of 0.22 ± 0.07 dB, the taper waist diameter of 15.5 ± 0.5 μm, and the elongation of 20.4 ± 0.3 mm has been used. The experimental results are presented for a liquid crystal cell filled with a mixture 1550* for parallel orientation of LC molecules to the cross section of the taper waist. Measurement results show the influence of the electrical field with voltage in the range of 0-200 V, without, as well as with different modulation for spectral characteristics. The sinusoidal and square signal shapes are used with a 1-10 Hz frequency range. Full Text: PDF ReferencesZ. Liu, H. Y. Tam, L. Htein, M. L.Vincent Tse, C. Lu, "Microstructured Optical Fiber Sensors", J. Lightwave Technol. 35, 16 (2017). CrossRef T. R. Wolinski, K. Szaniawska, S. Ertman1, P. Lesiak, A. W. Domański, R. Dabrowski, E. Nowinowski-Kruszelnicki, J. Wojcik "Influence of temperature and electrical fields on propagation properties of photonic liquid-crystal fibres", Meas. Sci. Technol. 17, 5 (2006). CrossRef K. Nielsen, D. Noordegraaf, T. Sørensen, A. Bjarklev,T. Hansen, "Selective filling of photonic crystal fibres", J. Opt. A: Pure Appl. Opt. 7, 8 (2005). CrossRef A. A. Rifat, G. A. Mahdiraji, D. M. Chow, Y, Gang Shee, R. Ahmed, F. Rafiq, M Adikan, "Photonic Crystal Fiber-Based Surface Plasmon Resonance Sensor with Selective Analyte Channels and Graphene-Silver Deposited Core", Sensors 15, 5 (2015) CrossRef Y. Huang, Z.Tian, L.P. Sun, D. Sun, J.Li, Y.Ran, B.-O. Guan "High-sensitivity DNA biosensor based on optical fiber taper interferometer coated with conjugated polymer tentacle", Opt. Express 23, 21 (2015). CrossRef X. Wang, O. S. Wolfbeis, "The 2016 Annual Review Issue", Anal. Chem., 88, 1 (2016). CrossRef Ye Tian, W. Wang, N. Wu, X. Zou, X.Wang, "Tapered Optical Fiber Sensor for Label-Free Detection of Biomolecules", Sensors 11, 4 (2011). CrossRef O. Katsunari, Fundamentals of Optical Waveguides, (London, Academic Press, (2006). DirectLink A. K. Sharma, J. Rajan, B.D. Gupta, "Fiber-Optic Sensors Based on Surface Plasmon Resonance: A Comprehensive Review", IEEE Sensors Journal 7, 8 (2007). CrossRef C. Caucheteur, T. Guo, J. Albert, "Review of plasmonic fiber optic biochemical sensors: improving the limit of detection", Anal. Bioanal.Chem. 407, 14 (2015). CrossRef S. F. Silva L. Coelho, O. Frazão, J. L. Santos, F. X.r Malcata, "A Review of Palladium-Based Fiber-Optic Sensors for Molecular Hydrogen Detection", IEEE SENSORS JOURNAL 12, 1 (2012). CrossRef H. Waechter, J. Litman, A. H. Cheung, J. A. Barnes, H.P. Loock, "Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy", Sensors 10, 3 (2010). CrossRef S. Zhu, F. Pang, S. Huang, F.Zou, Y.Dong, T.Wang, "High sensitivity refractive index sensor based on adiabatic tapered optical fiber deposited with nanofilm by ALD", Opt. Express 23, 11 (2015). CrossRef L. Zhang, J. Lou, L. Tong, "Micro/nanofiber optical sensors", Photonics sensor 1, 1 (2011). CrossRef L.Tong, J. Lou, E. Mazur, "Single-mode guiding properties of subwavelength-diameter silica and silicon wire waveguides", Opt. Express 11, 6 (2004). CrossRef H. Moyyed, I. T. Leite, L. Coelho, J. L. Santos, D. Viegas, "Analysis of phase interrogated SPR fiber optic sensors with bimetallic layers", IEEE Sensors Journal 14, 10 (2014). CrossRef A. González-Cano, M. Cruz Navarette, Ó. Esteban, N. Diaz Herrera , "Plasmonic sensors based on doubly-deposited tapered optical fibers", Sensors 14, 3 (2014). CrossRef K. A. Stasiewicz, J.E. Moś, "Threshold temperature optical fibre sensors", Opt. Fiber Technol. 32, (2016). CrossRef L. Zhang, F. Gu, J. Lou, X. Yin, L. Tong, "Fast detection of humidity with a subwavelength-diameter fiber taper coated with gelatin film", Opt. Express 16, 17 (2008). CrossRef S.Zhu, F.Pang, S. Huang, F. Zou, Q. Guo, J. Wen, T. Wang, "High Sensitivity Refractometer Based on TiO2-Coated Adiabatic Tapered Optical Fiber via ALD Technology", Sensors 16, 8 (2016). CrossRef G.Brambilla, "Optical fibre nanowires and microwires: a review", J. Optics 12, 4 (2010) CrossRef M. Ahmad, L.L. Hench, "Effect of taper geometries and launch angle on evanescent wave penetration depth in optical fibers", Biosens. Bioelectron. 20, 7 (2005). CrossRef L.M. Blinov, Electrooptic Effects in Liquid Crystal Materials (New York, Springftianer, 1994). CrossRef L. Scolari, T.T. Alkeskjold, A. Bjarklev, "Tunable Gaussian filter based on tapered liquid crystal photonic bandgap fibre", Electron. Lett. 42, 22 (2006). CrossRef J. Moś, M. Florek, K. Garbat, K.A. Stasiewicz, N. Bennis, L.R. Jaroszewicz, "In-Line Tunable Nematic Liquid Crystal Fiber Optic Device", J. of Lightwave Technol. 36, 4 (2017). CrossRef J. Moś, K A Stasiewicz, K Garbat, P Morawiak, W Piecek, L R Jaroszewicz, "Tapered fiber liquid crystal hybrid broad band device", Phys. Scripta. 93, 12 (2018). CrossRef Ch. Veilleux, J. Lapierre, J. Bures, "Liquid-crystal-clad tapered fibers", Opt. Lett. 11, 11 (1986). CrossRef R. Dąbrowski, K. Garbat, S. Urban, T.R. Woliński, J. Dziaduszek, T. Ogrodnik, A,Siarkowska, "Low-birefringence liquid crystal mixtures for photonic liquid crystal fibres application", Liq. Cryst. 44, (2017). CrossRef S. Lacroix, R. J. Black, Ch. Veilleux, J. Lapierre, "Tapered single-mode fibers: external refractive-index dependence", Appl. Opt., 25, 15 (1986). CrossRef J.F. Henninot, D. Louvergneaux , N.Tabiryan, M. Warenghem, "Controlled Leakage of a Tapered Optical Fiber with Liquid Crystal Cladding", Mol. Cryst.and Liq.Cryst., 282, 1(1996). CrossRef
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Shen, Rui, Dehui Lin, Zhe Liu, Honglei Zhai, and Xingbin Yang. "Fabrication of Bacterial Cellulose Nanofibers/Soy Protein Isolate Colloidal Particles for the Stabilization of High Internal Phase Pickering Emulsions by Anti-solvent Precipitation and Their Application in the Delivery of Curcumin." Frontiers in Nutrition 8 (September 7, 2021). http://dx.doi.org/10.3389/fnut.2021.734620.
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In this study, the anti-solvent precipitation and a simple complex method were applied for the preparation of bacterial cellulose nanofiber/soy protein isolate (BCNs/SPI) colloidal particles. Fourier transform IR (FT-IR) showed that hydrogen bonds generated in BCNs/SPI colloidal particles via the anti-solvent precipitation were stronger than those generated in BCNs/SPI colloidal particles self-assembled by a simple complex method. Meanwhile, the crystallinity, thermal stability, and contact angle of BCNs/SPI colloidal particles via the anti-solvent precipitation show an improvement in comparison with those of BCNs/SPI colloidal particles via a simple complex method. BCNs/SPI colloidal particles via the anti-solvent precipitation showed enhanced gel viscoelasticity, which was confirmed by dynamic oscillatory measurements. Furthermore, high internal phase Pickering emulsions (HIPEs) were additionally stable due to their stabilization by BCNs/SPI colloidal particles via the anti-solvent precipitation. Since then, HIPEs stabilized by BCNs/SPI colloidal particles via the anti-solvent precipitation were used for the delivery of curcumin. The curcumin-loaded HIPEs showed a good encapsulation efficiency and high 2,2-diphenyl-1-picrylhydrazyl (DPPH) removal efficiency. Additionally, the bioaccessibility of curcumin was significantly increased to 30.54% after the encapsulation using the prepared HIPEs. Therefore, it can be concluded that the anti-solvent precipitation is an effective way to assemble the polysaccharide/protein complex particles for the stabilization of HIPEs, and the prepared stable HIPEs showed a potential application in the delivery of curcumin.
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Ajmal, Gufran, Narender Yadav, Mohammad Rashid Iqba, and Pooja Mittal. "Electrospun Nanofiber: Application in Tissue Regeneration." International Journal of Life Science and Pharma Research, December 31, 2022, P127—P140. http://dx.doi.org/10.22376/ijlpr.2023.13.1.sp1.p127-140.
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Abstract: An injury to the human body is classified as a wound if it results in a cut or a break in the skin. Depending on the depth of the skin layer, a wound can either be limited to the epidermal layer, which heals via re-epithelialization without the need for skin grafts, or full-thickness wounds, which result in the loss of both the epidermis and dermis (FTW). A full-thickness wound cannot heal on its own and needs a skin graft or tissue regeneration product to heal quickly. This paper provides a comprehensive overview of the properties of electrospun nanofibers and their application as skin regeneration products rapid healing of the full-thickness wound. The paper first introduces the skin, its layers, and various problems associated with human skin. In the next part, a wound is discussed in terms of acute and chronic wounds. Primary, secondary and tertiary clinical wound healing has also been discussed. The next part briefly introduces the four different phases of healing, i.e. hemostasis, inflammation, proliferative and maturation of newly deposited collagen into tissues. The effect of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) on reactive oxygen species, reactive nitrogen species and reactive sulphur species, and their effect on healing time was discussed. The electrospinning process's evolution and setup, properties of electrospun nanofibers, a component of electrospinning solution, and various parameters affecting electrospinning were discussed. Application on nanofiber scaffold in terms of drug delivery and tissue regeneration was highlighted. In the end, improvement in the existing nanofibrous scaffold was briefly highlighted.
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Ajmal, Gufran, Narender Yadav, Mukesh Kumar Kumawat, Manoj Kumar Sharma, and Mohammad Rashid Iqbal. "Application of Electrospun Nanofiber in Wound Healing: Trends And Recent Patents Analysis." International Journal of Life Science and Pharma Research, December 24, 2022, L37—L47. http://dx.doi.org/10.22376/ijlpr.2023.13.1.sp1.l37-47.
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Abstract: A full-thickness open wound with loss of residual cells for regeneration does not heal spontaneously and takes a long duration for complete healing. Sometimes, this results in scarring of the skin and significant disability. A scaffold that provides a 3D framework for cell signaling, attachment, and proliferation is essential for the rapid closure of a full-thickness wound. Nowadays, the electrospun nanofiber is the most widely employed formulation in wound healing. The current study analyzed a patent trend analysis of electrospun nanofiber's application in tissue regeneration. The patent search was conducted using open-source patent databases like The Lens and Patentscope. Two hundred thirty-one patent records were found with the keywords and exported from the database for January 1, 2010, and December 31, 2021. After the initial screening, 24 patent documents were shortlisted for in-depth analysis. China, the USA, European Countries, Korea, and Australia lead this patent filing field. The top applicants are either private companies or academic institutions. The last ten years of patents were analyzed in terms of Patent-Applicant, Patent- Inventors, Patent-Owners, patent filed, published and granted. In the top ten Assignee, Marine Essence Bioscience Corp (US) topped the list. The most-recorded IPC class is A61L15/44, a subgroup of A61L15, and it is related to the chemical aspects of, or use of materials for, bandages, dressings or absorbent pads. In the end, some relevant patent was analyzed based on their citation by other patents and non-patent literature. From patent trend analysis, it was observed that the electrospun nanofiber would provide an attractive area for research in tissue regeneration.
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Eslahi, Niloofar, Tara Fatemi, Mehdi Varsei, and Saeed Bazgir. "Electrospinning of Smart Thermochromic Nanofibers as Sensors." Scientia Iranica, September 21, 2020, 0. http://dx.doi.org/10.24200/sci.2020.55714.4369.
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Ghafari, Amir Mohammad, Sareh Rajabi-Zeleti, Mohammad Naji, Mohammad Hossein Ghanian, and Hossein Baharvand. "Mechanical reinforcement of urinary bladder matrix by electrospun polycaprolactone nanofibers." Scientia Iranica, September 2, 2017, 0. http://dx.doi.org/10.24200/sci.2017.4418.
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