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Journal articles on the topic 'Ordered Nano-composite'
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1
Li Yan, Wang Cheng-Wei, Tian Jun, Liu Wei-Min, Chen Miao, and Li Hu-Lin. "Optical properties of ordered Co/AAO nano-array composite structure." Acta Physica Sinica 53, no. 5 (2004): 1594. http://dx.doi.org/10.7498/aps.53.1594.
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Guo Cai, Xu, DAI Ming Hu, JI Xiao Li, Zhang Xiao Mei, and Xing Hong Long. "Preparation and Ordered Self-Assembly of Nano-Pd-Ga/PMMA by Ultrasonic." Journal of Nanomaterials 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/368152.
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Nano-Ga-Pd/poly methyl methacrylate (PMMA) composite materials were prepared with the palladium chloride solution containing metal gallium, MMA as monomer, and sodium dodecyl sulfate (SDS) as emulsifier without initiatoror reducer. Pd, Ga, andGa5Pdphase in PMMA matrix were identified by XRD. The characteristic absorption peak at 200 nm for nano-Ga/PMMA polymer solution, at 209 nm for nano-Pd/PMMA polymer solution were proved by UV-Vis; the binding energy changes of O1s, Ga2p3, Ga2d, and Pd3d were characterized by means of X-ray photoelectron spectroscopy. It is concluded that nano-Ga5Pdwas produced based on segment electronics shifting from Gallium to Palladium, and coordination was formed on segment electronics from Gallium to oxygen of PMMA ester group. The anisotropism ordered assembly of PMMA around nano-Ga-Pd particles were illuminated by transmission electron microscopy; it is further interpreted that nano Ga-Pd particles had ordered-assembly induced effect.
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Khan, Sourav, Rayappan Pavul Raj, Talla Venkata Rama Mohan, and Parasuraman Selvam. "Electrochemical performance of nano-sized LiFePO4-embedded 3D-cubic ordered mesoporous carbon and nitrogenous carbon composites." RSC Advances 10, no. 51 (2020): 30406–14. http://dx.doi.org/10.1039/d0ra04754f.
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Nano-sized LiFePO4-embedded nitrogenous ordered mesoporous carbon composite cathode facilitate electronic conductivity and significantly enhances Li-ion diffusion and retains 97% of the initial discharge capacity at 1C rate even after 100 cycles.
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Wang, Hui, Dan Dai, Xin Zhang, and Xue Dong Wu. "Preparation and Characterization of TiO2 Nanowires on Aluminum Substrate." Materials Science Forum 610-613 (January 2009): 288–92. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.288.
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Combined with sol-gel method, ultrasonic impregnation approach was employed to prepare TiO2/ Al2O3 surface composite on aluminum. The results showed that with the effect of ultrasonic, the TiO2 colloid fabricated by sol-gel method can enter the inner of the ordered AAO film to form anatase TiO2 nano wires after being heated at 500°C for 2h. The diameters and lengths of TiO2 nano wires were controlled by the diameter and thickness of AAO film. Close to the bottom of aluminum substrate, the TiO2 nano wires became nano pipes, plates and particles.
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Chujo, Yoshiki, and Ryo Tamaki. "New Preparation Methods for Organic–Inorganic Polymer Hybrids." MRS Bulletin 26, no. 5 (May 2001): 389–92. http://dx.doi.org/10.1557/mrs2001.92.
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Nano-ordered composite materials consisting of organic polymers and inorganic compounds have been attracting attention for their use in creating high-performance or high-functionality polymeric materials. The term “polymer hybrid” describes blends of organic and inorganic components with molecular-level dispersions.
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Lin, Song Zhu, Feng Gao, and Ruo Kun Jia. "Preparation of Conductive Response Polyaniline/Polyurethane Orderde Array Thin Film." Advanced Materials Research 608-609 (December 2012): 1359–62. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1359.
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Polyaniline nano particles and polyaniline/polyurethane composite film were prepared through the template-free method. The ordered array structure of composite thin films with optical property were observed. The proportion of polyaniline/polyurethane in the composite films was discussed, and the change of resistance and absorbance of the thin films was measured in different proportion. In the energized condition polyaniline/polyurethane composite film had morphological changes, shrink trend, and their resistance value became significantly increasing. With the increase of the voltage electricity, the film contraction trend changed bigger.
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He, Yunfei, Yanan Liu, Xu Yan, Guangyu Qin, Yuhao Liu, Bo Zhong, Long Xia, Dongdong Liu, Yu Zhou, and Xiaoxiao Huang. "Mesoscopically ordered Fe3O4/C nano-composite for superior broadband electromagnetic wave absorption." Composites Part A: Applied Science and Manufacturing 158 (July 2022): 106983. http://dx.doi.org/10.1016/j.compositesa.2022.106983.
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Wang Jian, Wang Cheng-Wei, Li Yan, Liu Wei-Min, and Shigeaki Zaima. "Determination of optical parameters of ordered Ag/AAO nano-array composite structure." Acta Physica Sinica 54, no. 12 (2005): 5920. http://dx.doi.org/10.7498/aps.54.5920.
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Bian, Tierong, Heng Zhang, and Hongyun Xing. "Preparation and biological properties of collagen/nano-hydroxyapatite composite nanofibers based on ordered nano-hydroxyapatite ceramic fibers." Colloids and Surfaces A: Physicochemical and Engineering Aspects 602 (October 2020): 124802. http://dx.doi.org/10.1016/j.colsurfa.2020.124802.
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Sumitomo, Taro, Hideki Kakisawa, Yusuke Owaki, and Yutaka Kagawa. "Structure of Natural Nano-Laminar Composites: TEM Observation of Nacre." Materials Science Forum 561-565 (October 2007): 713–16. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.713.
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Nacre is a natural composite material making up the inner structure of mollusk shells. It has been of great interest in materials research due to its mechanical properties far exceeding that of its individual components: well ordered plates of aragonite (a CaCO3 polymorph) within an organic polymer matrix. Generally the aragonite plates had been treated as single crystals and mechanical behavior explained as the result of micro-scale mechanisms between plates and matrix. However, recent work has shown that the plates themselves are made up of smaller nano-scale structures, which are also thought to contribute to the bulk properties. In this work, transmission electron microscopy (TEM) was used to observe the nano-scale structure of nacre from abalone. “Nanograins” of aragonite surrounded by organic material was observed, showing composite structure within aragonite plates.
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Xie, Yi Bing, Li Min Zhou, and Hai Tao Huang. "Biosensor Application of Enzyme-Functionalized Titania/Titanium Composite." Key Engineering Materials 334-335 (March 2007): 645–48. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.645.
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Highly-ordered titania nanotube array has been fabricated by a potentiostatic anodization process in acidic fluoride electrolyte. Calcination at high temperature is followed to achieve crystallization from amorphous to anatase phase. The approach of embedding bioactive enzymes inside titania tubule channels has been applied for bioactivation modification of titania/titanium. The electropolymerization process is applied by using conductive pyrrole monomer to achieve surface immobilization of enzymes to improve interfacial connection. Characterizations including field emission scanning electron microscopy, nano-indentation and linear sweep voltammetry measurements have been performed to fully evaluate the surface morphology, nanomechanical and electrochemical properties of this composite. Molecule detection application has been investigated by applying such an enzyme-titania/titanium composite.
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Chi, Xiaohong, Lu Cheng, Wenfeng Liu, Xiaohong Zhang, and Shengtao Li. "Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica." Materials 11, no. 8 (July 30, 2018): 1321. http://dx.doi.org/10.3390/ma11081321.
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Polypropylene (PP) contains promising application prospects in thermoplastic cables for high voltage direct current (HVDC) power transmission because of its outstanding thermal and dielectric properties. However, the problem of poor toughness and space charge has restricted the application of pure PP in HVDC cables. In this paper, polyolefin elastomer (POE) and nano-silica were blended thoroughly and added into a PP mixture by a melting method. Scanning electron microscopy (SEM) was employed to observe the dispersion of POE and nanoparticles. Thermal properties were characterized by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Mechanical properties were evaluated by tensile tests. The elastomeric properties of composites were improved as the dispersed POE could transfer and homogenize external mechanical forces. DC breakdown results showed that the fail strength of composite with 10 phr POE and 1 phr nano-silica was obviously enhanced. The pulsed electro-acoustic (PEA) results showed that the injection and accumulation of space charge was increased by the introduction of POE, while it was restrained by the collective effect caused by nano-silica filling. X-ray diffraction (XRD) spectrograms showed that secondary ordered structures existed in the composites of PP, POE, and nano-silica, and that the ordered structure around the nanoparticles contributed to the enhancement of breakdown strength. The mechanical and dielectric properties were modified synergistically, which made the modified PP a propitious insulation material for HVDC cables.
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Górski, Ludwik, and Andrzej Pawłowski. "Studies on Al2O3 - ZrO2 Coatings Structure before and after Thermal Treatment." Solid State Phenomena 130 (December 2007): 297–301. http://dx.doi.org/10.4028/www.scientific.net/ssp.130.297.
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Phase transitions occurring in the Al2O3-ZrO2 composite as a result of plasma spraying and subsequent coating annealing are described. X-ray diffraction and transmission electron microscopy methods are applied to study these effects. Separate layers of amorphous, nano- and fine-crystalline structure with the columnar crystals areas have been observed. Thermal treatment causes formation of more ordered phases. Effect of partial stabilization of cubic and tetragonal zirconia due to the presence of alumina has been remarked.
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Xie, Jinshu, Jinghuai Zhang, Shujuan Liu, Zihao You, Zhi Zhang, Tengfei Zhao, Xiaobo Zhang, and Ruizhi Wu. "Developing Mg-Gd-Dy-Ag-Zn-Zr Alloy with High Strength via Nano-Precipitation." Nanomaterials 13, no. 7 (March 29, 2023): 1219. http://dx.doi.org/10.3390/nano13071219.
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A high-performance Mg-10Gd-4Dy-1.5Ag-1Zn-0.5Zr (wt.%, EQ142X) alloy was designed by multi-element composite addition in this work, obtaining a high yield strength (~396 MPa) and ultimate tensile strength (~451 MPa) after hot extrusion and ageing. The high strength is mainly related to fine grains and nano-precipitates, especially the latter. β′ and γ″ nano-precipitation with high fractions are the main strengthening phases, leading to a strengthening increment of ~277 MPa. Moreover, the multi-element alloying in this study promotes the basal-prismatic network strengthening structure, composed of β′ nano-precipitation with (1-210) habit planes, γ″ nano-precipitation with (0001) habit planes, basal plane stacking faults and 14H-long period stacking ordered phase. In addition, the dislocations and fine grains introduced by the hot-extrusion process not only accelerate the precipitation rate of nanostructure and thus improve the ageing hardening efficiency, but also facilitate the formation of more uniform and finer nano-precipitation. Thus, it is proposed that introducing nano-precipitates network into fine-grained structure is an effective strategy for developing high-strength Mg alloys.
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Wu, Linda Y. L., B. Leng, and A. Bisht. "Metal–polymer nano-composite films with ordered vertically aligned metal cylinders for sub-wavelength imaging." Applied Physics A 116, no. 3 (May 9, 2014): 893–900. http://dx.doi.org/10.1007/s00339-014-8457-5.
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Li, Juan, Naiqing Zhang, Kening Sun, and Zhengbin Wu. "High thermal stability of three-dimensionally ordered nano-composite cathodes for solid oxide fuel cells." Electrochimica Acta 187 (January 2016): 179–85. http://dx.doi.org/10.1016/j.electacta.2015.11.063.
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Hunyadi Murph, Simona E., and Katie Heruox. "Shape-Selective Mesoscale Nanoarchitectures: Preparation and Photocatalytic Performance." Catalysts 10, no. 5 (May 12, 2020): 532. http://dx.doi.org/10.3390/catal10050532.
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We create ordered arrays of shape-selective gold-titania composite nanomaterials at the mesoscale (100 µm to 5 mm) by a combination of both bottom-up and top-down approaches for exquisite control of the size, shape, and arrangement of nanomaterials. Lithographic techniques along with wet chemical synthetic methods were combined to create these composite nanomaterials. The photocatalytic activity of these TiO2, TiO2-Au and SiO2-TiO2-Au nano-composite mesoscale materials was monitored by the photodegradation of a model analyte, methyl orange, under UV and visible (Vis) illumination. Bare TiO2- and SiO2-TiO2-coated pillar arrays showed significant activity toward methyl orange in UV light with degradation rates on the order of 10−4–10−3 min−1. The photocatalytic activity of these arrays was also found to depend on the nanoparticle shape, in which particles with more edges and corners were found to be more reactive than spherical particles (i.e., the photocatalytic activity decreased as follows: diamonds > squares > triangles > spheres). SiO2-TiO2-Au nano-composite pillar arrays were tested in both UV and Vis light and showed increased activity in Vis light but decreased activity in UV light as compared to the bare semiconductor arrays. Additionally, the Au nanorod-functionalized nanoarrays exhibit a strong shape-dependence in their photocatalytic activity toward methyl orange degradation in Vis light.
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Panin, S. V., L. A. Kornienko, N. Sonjaitham, M. V. Tchaikina, V. P. Sergeev, L. R. Ivanova, and S. V. Shilko. "Wear-Resistant Ultrahigh-Molecular-Weight Polyethylene-Based Nano- and Microcomposites for Implants." Journal of Nanotechnology 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/729756.
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The influence of modification by hydroxyapatite (HA) nano- and microparticles on tribotechnical properties of ultrahigh-molecular-weight polyethylene (UHMWPE) was investigated to develop polymer implants for endoprosthesis. It was shown that modification of UHMWPE by hydroxyapatite nanoparticles within range of 0.1–0.5 wt.% results in increase of wear resistance at dry sliding by 3 times. On the other hand adding of 20 wt.% of micron size HA gives rise to the same effect. The effect of increasing wear resistance is not substantially changed at surface treatment of the nano- and microcomposites by N+ion beams as compared with nonirradiated blends. Preliminary joint mechanical activation of UHMWPE powder and fillers results in more uniform distribution of nanofillers in the matrix and, as a result, formation of more ordered structure. Structure within bulk material and surface layers was studied by means of optical profilometry, scanning electron microscopy, infrared spectroscopy, and differential scanning calorimetry. It is shown that adding of hydroxyapatite nanoparticles and high-energy surface treatment of the composite by N+ion implantation improve tribotechnical properties of UHMWPE due to formation of chemical bonds in the composite (crosslinking) and ordering of permolecular structure.
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Erts, Donats, B. Polyakov, E. Saks, H. Olin, L. Ryen, K. Ziegler, and J. D. Holmes. "Semiconducting Nanowires: Properties and Architectures." Solid State Phenomena 99-100 (July 2004): 109–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.109.
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The paper describes the use of an in-situ microscopy technique, which combines transmission electron microscopy (TEM) with scanning probe microscopy (SPM), to investigate the electrical and mechanical properties of individual silicon and germanium nanowires. Additionally, the formation of ordered arrays of size-monodisperse silicon and germanium nanowires within mesoporous silica powders and thin films using a supercritical fluid inclusion phase technique is described. In particular, we demonstrate ultra high-density arrays of germanium nanowires, up to 2 x 1012 wires per square centimetre. These matric embedded nano-composite materials display unique optical properties such as intense room temperature ultraviolet and visible photoluminescence.
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Jiang, Haipeng, Mingshu Bi, Tianjiao Zhang, Sheng Shang, and Wei Gao. "A novel reactive P-containing composite with an ordered porous structure for suppressing nano-Al dust explosions." Chemical Engineering Journal 416 (July 2021): 129156. http://dx.doi.org/10.1016/j.cej.2021.129156.
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Emamian, H. R., A. Honarbakhsh-Raouf, and A. Ataie. "Preparation of Magnetic Nano-Composite: Barium Hexaferrite Loaded in the Ordered Meso-Porous Silica Matrix (MCM-41)." Journal of Nanoscience and Nanotechnology 10, no. 4 (April 1, 2010): 2897–900. http://dx.doi.org/10.1166/jnn.2010.1402.
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He, Si Min, Jin Chen, Kuang Fang, Zhi Qiang Qiao, and Jin Shan Li. "Synthesis of Nano-Al with Fe2O3 Nanowires to Realize Core-Shell Composite Materials Arrays Based on Colloidal Templates." Key Engineering Materials 645-646 (May 2015): 347–51. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.347.
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Controlled composite materials arrays have been widely applied for their unique physical and chemical properties, with the aim of developing nanodevices functionality. Nanosphere lithography is a successful technique for fabricating highly ordered arrays of various materials. In this work, the polystyrene colloidal crystal template in large area on Si substrate was obtained via dipping method. The thickness of the single layer template fabricated can be precisely controlling the particle concentration and the film formation speed. The ordered arrays of Fe2O3 nanowires were obtained via convenient spin method on this template and heat treatment subsequently. Finally, the uniform Al/Fe2O3 arrays were produced by magnetron sputtering method. These periodic composite arrays cover large area substrates (of dimensions > 1 cm × 1 cm) and are uniform in terms of nanowire height and density. The arrays thickness and gaps between nanowires are easily controlled by either the diameter of colloidal crystal or the parameters of magnetron sputtering.
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Ammakutti Sridevi, N., K. Karuppasamy, C. Vijil Vani, S. Balakumar, and X. Sahaya Shajan. "Characterization of Nanochitosan Incorporated Solid Polymer Composite Electrolytes for Magnesium Batteries." Advanced Materials Research 678 (March 2013): 316–20. http://dx.doi.org/10.4028/www.scientific.net/amr.678.316.
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Chitin and chitosan, the most abundant biopolymers possess several excellent advantages such as biodegradability, ecological friendly, biocompatibility, low toxicity, bioactive, antimicrobial activity and low immunogenicity. They occur as ordered crystalline micro fibrils and are useful in applications that require reinforcement and strength. Nanochitosan was prepared from chitosan by oxidation degradation method using H2O2. Nanocomposites polymer electrolyte system composed of polyethylene oxide (PEO) as the host polymer, magnesium perchlorate Mg(ClO4)2 as salt and different concentration of nano-sized chitosan as filler have been studied. The effects of addition of nanochitosan on the ionic conductivity of composite polymer electrolytes are investigated and it is found to rise upon one order (10-3 Scm-1). The complexation behavior of PEO and Mg(ClO4)2 are verified through FT-IR studies. The nanocomposite films possess uniform surface morphology which has been identified by SEM analysis.
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Zhang, Kaiyue, Wei Xiao, Jianguo Liu, and Chuanwei Yan. "A Novel Self-Binding Composite Separator Based on Poly(tetrafluoroethylene) Coating for Li-Ion Batteries." Polymers 10, no. 12 (December 19, 2018): 1409. http://dx.doi.org/10.3390/polym10121409.
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In this study, a novel composite separator based on polytetrafluoroethylene (PTFE) coating layers and a commercial polyethylene (PE) separator is developed for high performance Li-ion batteries. This composite separator is prepared by immersing a PE separator directly into a commercial PTFE suspension to obtain a self-binding PTFE/PE/PTFE tri-layered structure. Then, the as-prepared composite separator is further treated with a H2O2/H2SO4 solution to enhance its electrolyte affinity. The results show that the coating layer, consisting of close-packed PTFE particles, possesses a highly ordered nano-porous structure and an excellent electrolyte wettability property, which significantly enhance the ionic conductivity of the composite separator. Due to the presence of the PTFE-based coating layer, the composite separator exhibits better thermal stability compared with the PE separator, reaching the thermal-resistant grade of commercial ceramic-coated separators. By using different separators, CR2032-type unit half-cells composed of a Li anode and a LiFePO4 cathode were assembled, and their C-rate and cycling performances were evaluated. The cell assembled with the composite separator was proven to have better C-rate capability and cycling capacity retention than the cell with the polyethylene separator. It is expected that the composite separator can be a potential candidate as a coating-type separator for high-performance rechargeable Li-ion batteries.
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Banerjee, Arghya, and Nilanjan Halder. "Electrochemical Growth of Ordered Nickel Nano-Rods Within a Composite Structure of Anodic-Alumina-Membrane/Metal/Silicon Substrate." Journal of Nanoscience and Nanotechnology 10, no. 7 (July 1, 2010): 4252–58. http://dx.doi.org/10.1166/jnn.2010.2675.
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AHN, SEUNGHYUN, HYUN KOO, SUNG-HWAN BAE, CHAN PARK, GUYOUNG CHO, IKWHANG CHANG, SUK-WON CHA, and YOUNG-SUNG YOO. "EFFECT OF NICKEL CONTENTS ON THE MICROSTRUCTURE OF MESOPOROUS NICKEL OXIDE/GADOLINIUM-DOPED CERIA." Functional Materials Letters 06, no. 06 (November 27, 2013): 1350055. http://dx.doi.org/10.1142/s1793604713500550.
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The effect of NiO contents on the microstructure of mesoporous NiO - Gd 0.25 Ce 0.75 O 2-x ( NiO -GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO -GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO -GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO -GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.
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Liu, Yanmei, Yunna Sun, Yan Wang, Guifu Ding, Bin Sun, and Xiaolin Zhao. "A complex reinforced polymer interposer with ordered Ni grid and SiC nano-whiskers polyimide composite based on micromachining technology." Electronic Materials Letters 13, no. 1 (December 22, 2016): 29–36. http://dx.doi.org/10.1007/s13391-017-6199-1.
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Khan, Sourav, Rayappan P. Raj, Talla V. R. Mohan, Subramani Bhuvaneswari, Upadhyayula V. Varadaraju, and Parasuraman Selvam. "Electrochemical performance of nano-LiFePO4 embedded ordered mesoporous nitrogenous carbon composite as cathode material for Li-ion battery applications." Journal of Electroanalytical Chemistry 848 (September 2019): 113242. http://dx.doi.org/10.1016/j.jelechem.2019.113242.
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Sarikaya, Mehmet. "Organic-inorganic interfaces in biological composites." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 426–27. http://dx.doi.org/10.1017/s0424820100169869.
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Biological hard tissues, such as bone, dentin, and mollusk shells, are composite materials incorporating an organic matrix and inorganic crystallites in a complex nano- and micro-architectural forms. The interest of physical sciences in biological composites stems from the fact that these materials are self assembled in an hierarchical fashion from molecular to macro scale, and that the resulting assemblies have properties that far exceed those of current synthetic materials of similar elemental or phase compositions. The objective of biomimetics is to either mimick structures of biological composites, biomimicking, or use the synthesis methodologies of organisms to produce new materials, bioduplication. In a biocomposite, substructure and crystallography of the inorganic component are highly ordered, its morphology and shape are species specific; these are all thought to be regulated by the organic matrix. The understanding of ructural relationship between the organic and ceramic components of a biological composite, therefore, is fundamental both to the understanding of mechanisms of biomineralization and to biomimetic design and synthesis of novel engineering materials. These issues will be addressed in the present paper.
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Шилько, Сергей, Sergey Shil'ko, Дмитрий Черноус, Dmitriy Chernous, Татьяна Рябченко, and Tat'yana Ryabchenko. "SENSITIVITY CALCULATION OF PIEZOELECTRIC PRESSURE SENSOR BASED ON ALUMINUM ANODIC OXIDE IMPREGNATED WITH POLYMER." Bulletin of Bryansk state technical university 2019, no. 7 (July 29, 2019): 76–3. http://dx.doi.org/10.30987/article_5d2d923295da08.42628593.
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The application of highly ordered thin ceramic coatings with nano-dimensional pores obtained by metal anodic oxidation in pressure sensors of a matrix type is promising. For this purpose the pores of a ceramic base are impregnated with polymer realizing a direct piezoelectric effect.
There is developed a procedure for the calculated definition of piezoelectric pressure sensor sensitivity which is a thin coating made of nano-porous aluminum anodic oxide the pores of which are filled with polyvinylidene fluoride.
The procedure is based on a three-phase model of fiber-reinforced composite and a simplified problem setting of electroelasticity. The sensor is modeled by a thin two-layer coating located on a conditionally non-deformable base.
It is defined that for a coating lying freely on a rigid foundation the sensitivity is directly proportional to volume fraction of the polymer filler. For a coating con-nected in an adhesion way with the base the sensitivity dependence upon a filler share is close to a quadratic one. The estimated assessments of sensor characteristics under analysis at different ways of fastening coincide at 58% volume content of polymer piezoelectric.
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Anil Kumar, Yedluri, Ganesh Koyyada, Dasha Kumar Kulurumotlakatla, Jae Hong Kim, Md Moniruzzaman, Salem Alzahmi, and Ihab M. Obaidat. "In Situ Grown Mesoporous Structure of Fe-Dopant@NiCoOX@NF Nanoneedles as an Efficient Supercapacitor Electrode Material." Nanomaterials 13, no. 2 (January 10, 2023): 292. http://dx.doi.org/10.3390/nano13020292.
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In this study, we designed mixed metal oxides with doping compound nano-constructions as efficient electrode materials for supercapacitors (SCs). We successfully prepared the Fe-dopant with NiCoOx grown on nickel foam (Fe-dopant@NiCoOx@NF) through a simple hydrothermal route with annealing procedures. This method provides an easy route for the preparation of high activity SCs for energy storage. Obtained results revealed that the Fe dopant has successfully assisted NiCoOx lattices. The electrochemical properties were investigated in a three-electrode configuration. As a composite electrode for SC characteristics, the Fe-dopant@NiCoOx@NF exhibits notable electrochemical performances with very high specific capacitances of 1965 F g−1 at the current density of 0.5 A g−1, and even higher at 1296 F g−1 and 30 A g−1, respectively, which indicate eminent and greater potential for SCs. Moreover, the Fe-dopant@NiCoOx@NF nanoneedle composite obtains outstanding cycling performances of 95.9% retention over 4500 long cycles. The improved SC activities of Fe-dopant@NiCoOx@NF nanoneedles might be ascribed to the synergistic reactions of the ternary mixed metals, Fe-dopant, and the ordered nanosheets grown on NF. Thus, the Fe-dopant@NiCoOx@NF nanoneedle composite with unique properties could lead to promising SC performance.
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Fu, Junxia, Xiaohong Tan, and Yan Tang. "Postcare for Repairing Nerve and Tendon Injury Based on Biomimetic Nano-Parallel Material Composite Protein." Advances in Materials Science and Engineering 2022 (July 20, 2022): 1–11. http://dx.doi.org/10.1155/2022/1272673.
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Natural tendons are composed of ordered parallel arrangement of bundles of type I collagen fibers. It is responsible for transmitting the forces generated by the bones and muscles to move the body. Tendon injuries are common sports injuries, accounting for 50% of sports injuries. In adulthood, factors such as few tendon tissue cells and poor blood supply make it difficult to heal on their own after injury. Therefore, restoring the structure and function of native tendon tissue is still an unsolved problem. The purpose of this study is to study the use of biomimetic nano-parallel material composite proteins to induce the directional differentiation of stem cells to tendon lineages to promote muscle regeneration and repair. This study proposes to prepare composite protein nanomaterials by simulating the parallel arrangement of tendon collagen fibers. This can facilitate the directed differentiation of fibroblasts into tendon lineages. It can use the BP algorithm in the neural network algorithm to simulate the parallel arrangement of tendon collagen fibers, which is more efficient than other schemes. The experimental results in this study show that the rat cells are repaired after about 6 weeks. Tendon repair enters a remodeling phase with reduced cell numbers, collagen, and mucopolysaccharide synthesis. During this period, tendon repair gradually changes from the cellular level to the tissue level, and tenocyte metabolism remains high. Tenocytes and collagen fibers are aligned in the direction of stress. A higher proportion of collagen 1 synthesis occurs during this period. Collagen 1 accounts for 65% to 80% of the dry weight of the tendon, which plays the most important role in the mechanical properties of the tendon.
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Nayl, AbdElAziz A., Ahmed I. Abd-Elhamid, Wael A. A. Arafa, Ismail M. Ahmed, Aref M. E. AbdEl-Rahman, Hesham M. A. Soliman, Mohamed A. Abdelgawad, Hazim M. Ali, Ashraf A. Aly, and Stefan Bräse. "A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media." Materials 16, no. 2 (January 5, 2023): 514. http://dx.doi.org/10.3390/ma16020514.
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This work aims to prepare a novel phosphate-embedded silica nanoparticles (P@SiO2) nanocomposite as an effective adsorbent through a hydrothermal route. Firstly, a mixed solution of sodium silicate and sodium phosphate was passed through a strong acidic resin to convert it into hydrogen form. After that, the resultant solution was hydrothermally treated to yield P@SiO2 nanocomposite. Using kinetic studies, methylene blue (MB) dye was selected to study the removal behavior of the P@SiO2 nanocomposite. The obtained composite was characterized using several advanced techniques. The experimental results showed rapid kinetic adsorption where the equilibrium was reached within 100 s, and the pseudo-second-order fitted well with experimental data. Moreover, according to Langmuir, one gram of P@SiO2 nanocomposite can remove 76.92 mg of the methylene blue dye. The thermodynamic studies showed that the adsorption process was spontaneous, exothermic, and ordered at the solid/solution interface. Finally, the results indicated that the presence of NaCl did not impact the adsorption behavior of MB dye. Due to the significant efficiency and promising properties of the prepared P@SiO2 nanocomposite, it could be used as an effective adsorbent material to remove various cationic forms of pollutants from aqueous solutions in future works.
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Kim, Eun-Sik, and Baolin Deng. "Fabrication of polyamide thin-film nano-composite (PA-TFN) membrane with hydrophilized ordered mesoporous carbon (H-OMC) for water purifications." Journal of Membrane Science 375, no. 1-2 (June 2011): 46–54. http://dx.doi.org/10.1016/j.memsci.2011.01.041.
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Shen, Ying, Dawei Li, Bingyao Deng, Qingsheng Liu, Huizhong Liu, and Tong Wu. "Robust polyimide nano/microfibre aerogels welded by solvent-vapour for environmental applications." Royal Society Open Science 6, no. 8 (August 2019): 190596. http://dx.doi.org/10.1098/rsos.190596.
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Due to the high porosity, resilience and ultra-low density, polymer nanofibre-derived aerogels (NFAs) have been widely investigated in recent years. However, welding of the fibrous networks of NFAs, which has been proved extremely essential to their structural performance, still remains a major challenge. Herein, electrospun polyimide (PI) nano/microfibres were used as building blocks to construct hierarchically porous aerogels through a solid-templating technique. By further welding the adjacent nano/microfibres at their cross-points in a controllable fashion by solvent-vapour, super elasticity was achieved for the aerogels, with a recoverable ultimate strain of 80%. It is noteworthy that this process is free from cross-linking, heating and significant structure changing (i.e. chemical structure, crystallinity and fibrous network). Additionally, the porous structure of PI nano/microfibre aerogels (PI-N/MFAs) could be tuned by adjusting the organization of microfibres from a disordered/ordered cellular to a uniform structure. The as-obtained aerogels showed ultra-low density (4.81 mg cm −3 ), high porosity (99.66%), and comparable or higher recoverable compressive strain and stress relative to the other nanofibre-based aerogels. Furthermore, we showed the potential of such an aerogel for particle or aerosol filtration. PI nanofibre aerogels composite filters (PI-NFACFs) manifested excellent performance in PM 2.0 filtration (99.6% filtration efficiency with 115 Pa pressure drop). Therefore, this study brought a new perspective on the simple preparation of nanofibre-based aerogels for air filtration.
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Mamidi, Narsimha, Ramiro Velasco Delgadillo, Aldo Gonzáles Ortiz, and Enrique Barrera. "Carbon Nano-Onions Reinforced Multilayered Thin Film System for Stimuli-Responsive Drug Release." Pharmaceutics 12, no. 12 (December 13, 2020): 1208. http://dx.doi.org/10.3390/pharmaceutics12121208.
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Herein, poly (N-(4-aminophenyl) methacrylamide))-carbon nano-onions (PAPMA-CNOs = f-CNOs) and anilinated-poly (ether ether ketone) (AN-PEEK) have synthesized, and AN-PEEK/f-CNOs composite thin films were primed via layer-by-layer (LbL) self-assembly for stimuli-responsive drug release. The obtained thin films exhibited pH-responsive drug release in a controlled manner; pH 4.5 = 99.2% and pH 6.5 = 59.3% of doxorubicin (DOX) release was observed over 15 days. Supramolecular π-π stacking interactions between f-CNOs and DOX played a critical role in controlling drug release from thin films. Cell viability was studied with human osteoblast cells and augmented viability was perceived. Moreover, the thin films presented 891.4 ± 8.2 MPa of the tensile strength (σult), 43.2 ± 1.1 GPa of Young’s modulus (E), and 164.5 ± 1.7 Jg−1 of toughness (K). Quantitative scrutiny revealed that the well-ordered aligned nanofibers provide critical interphase, and this could be responsible for augmented tensile properties. Nonetheless, a pH-responsive and mechanically robust biocompatible thin-film system may show potential applications in the biomedical field.
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Zhang, Baoguo, Ling Tong, Lin Wu, Xiaoyu Yang, Zhiyuan Liao, Ao Chen, Yilai Zhou, Ying Liu, and Ya Hu. "Design of ultrafine silicon structure for lithium battery and research progress of silicon-carbon composite negative electrode materials." Journal of Physics: Conference Series 2079, no. 1 (November 1, 2021): 012005. http://dx.doi.org/10.1088/1742-6596/2079/1/012005.
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Abstract As demand for high-performance electric vehicles, portable electronic equipment, and energy storage devices increases rapidly, the development of lithium-ion batteries with higher specific capacity and rate performance has become more and more urgent. As the main body of lithium storage, negative electrode materials have become the key to improving the performance of lithium batteries. The high specific capacity and low lithium insertion potential of silicon materials make them the best choice to replace traditional graphite negative electrodes. Pure silicon negative electrodes have huge volume expansion effects and SEI membranes (solid electrolyte interface) are easily damaged. Therefore, researchers have improved the performance of negative electrode materials through silicon-carbon composites. This article introduces the current design ideas of ultra-fine silicon structure for lithium batteries and the method of compounding with carbon materials, and reviews the research progress of the performance of silicon-carbon composite negative electrode materials. Ultra-fine silicon materials include disorderly dispersed ultra-fine silicon particles such as porous structures, hollow structures, and core-shell structures; and ordered ultra-fine silicon, such as silicon nanowire arrays, silicon nanotube arrays, and interconnected silicon nano-films. The article analyzes and compares the composite method of ultrafine silicon and carbon materials with different structural designs, and the effect of composite negative electrode materials on the specific capacity and cycle performance of the battery. Finally, the research direction of silicon-carbon composite negative electrode materials is prospected.
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Li, Kai, Yihui Zhao, Maiqi Liu, Xiaoying Wang, Fangyuan Zhang, and Dazhi Wang. "A multi-scale E-jet 3D printing regulated by structured multi-physics field." Journal of Micromechanics and Microengineering 32, no. 2 (December 31, 2021): 025005. http://dx.doi.org/10.1088/1361-6439/ac43d1.
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Abstract Micro/nano scale structure as important functional part have been widely used in wearable flexible sensors, gas sensors, biological tissue engineering, microfluidic chips super capacitors and so on. Here a multi-scale electrohydrodynamic jet (E-jet) 3D printing approach regulated by structured multi-physics fields was demonstrated to generate 800 nm scale 2D geometries and high aspect ratio 3D structures. The simulation model of jetting process under resultant effect of top fluid field, middle electric field and bottom thermal field was established. And the physical mechanism and scale law of jet formation were studied. The effects of thermal field temperature, applied voltage and flow rate on the jet behaviors were studied; and the range of process parameters of stable jet was obtained. The regulation of printing parameters was used to manufacture the high resolution gradient graphics and the high aspect ratio structure with tight interlayer bonding. The structural features could be flexibly adjusted by reasonably matching the process parameters. Finally, polycaprolactone/polyvinylpyrrolidone (PCL/PVP) composite scaffolds with cell-scale fiber and ordered fiber spacing were printed. The proposed E-jet printing method provides an alternative approach for the application of biopolymer materials in tissue engineering.
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Filipov, E., L. Angelova, D. Aceti, V. Marinova, D. Karashanova, A. Trifonov, I. Buchvarov, and A. Daskalova. "Altering the surface morphology and wettability of chitosan/graphene coatings by femtosecond and nanosecond laser processing." Journal of Physics: Conference Series 2240, no. 1 (March 1, 2022): 012041. http://dx.doi.org/10.1088/1742-6596/2240/1/012041.
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Abstract A major drawback of the currently used orthopedic implants is the formation of a bacterial biofilm on their surface after implantation. A potential strategy for overcoming this problem is developing micro- and nano-structured motifs on the implant’s surface to prevent bacterial attachment. Additionally, the use of materials with inherent antimicrobial properties could further stall the aggregation of bacteria. This paper demonstrates an approach to obtaining a modified surface topography on chitosan-graphene 2D films via femtosecond and nanosecond laser treatment. Atomic force microscopy (AFM) revealed that laser irradiation leads to a strong surface roughness increase due to formation of non-ordered topography features with peak-to-valley distance ranging between 200 nm and 1 μm. Interestingly, sharp single protrusions (∼200 nm) were observed on the untreated samples. Transmission electron microscopy analysis confirmed the presence of graphene monolayers within the composite films. Wettability tests showed that nanosecond laser ablation of the samples resulted in super hydrophilic surface properties, which repel bacteria per se. Based on our findings, we hypothesized that the topography motifs of both laser treated and untreated samples could potentially impede bacterial attachment via different mechanisms – reduction of contact points for adhesion or restriction of motility.
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Kaytbay, S. H., S. F. Moustafa, and W. M. Daoush. "Solid-State Reaction in Al-Fe Binary System Induced by Mechanical Alloying." Defect and Diffusion Forum 272 (March 2008): 15–24. http://dx.doi.org/10.4028/www.scientific.net/ddf.272.15.
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Mechanical alloying (MA) is a solid-state powder processing method which has the ability to synthesize a variety of new alloy phases including supersaturated solid solutions, nanocrystalline structures, amorphous phases and intermetallic compounds. In this investigation, the interaction between aluminum and iron caused by MA of Fe-xAl (where X ranged from 30 to 90%) was studied as a function of milling time and post heat-treating temperatures. The sequences of structural and/or phase transformation and the behavior of mechanically alloyed powders have been assessed using XRD, hardness and magnetometer. It was found that during mechanical milling of elemental powder Al and Fe, five milling stages were categorized, namely, particle flattening, welding predominance, equiaxed formation, random welding orientation and steady state composite particles. All milled powders showed nano-sized powder mixtures after milling for 20hrs. When Fe-30%Al powder was milled for 150hrs, a partially ordered AlFe phase was obtained. However, when these saturated solid solutions were heat treated at 500 °C, the AlFe intermetallic was precipitated fully ordered. When the Al content was increased up to 40% and milled for 50hr, the XRD pattern showed a broad halo spectrum which showed the formation of an amorphous phase. When a Fe-60%Al powder mixture was mechanically milled for 50hr, the Al5Fe2 intermetallic formed that was associated with an amorphous phase, which transformed into the Al3Fe intermetallic by heat treating at 500°C. In the case of Fe-75% and Fe-90%Al milled for 150hrs only Al peaks appeared and were shifted to higher angles, suggesting that Fe atoms diffused into Al, leading to the formation of a solid solution.
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Shi, Jianhao, Bin Sun, Hongfang Li, Kai Xia, Xiaojing Zhang, Guifu Ding, Tingrui Pan, and Zhuoqing Yang. "A flexible pressure sensor by induced ordered nano cracks filled with multilayer graphene oxide composite film as a conductive fine-wire network for higher sensitivity." Flexible and Printed Electronics 4, no. 1 (February 4, 2019): 015003. http://dx.doi.org/10.1088/2058-8585/aaf847.
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Mansur, Herman S., and Alexandra A. P. Mansur. "Synchrotron SAXS, XRD and FTIR Characterization of Nanostructured PVA/TEOS Hybrid Cross-Linked with Glutaraldehyde." Solid State Phenomena 121-123 (March 2007): 855–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.855.
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Polyvinyl alcohol (PVA) is a unique synthetic biocompatible polymer and it has a large number of hydroxyl groups that can react with many kinds of functional groups. In the present work, nanostructured PVA/TEOS hybrids were characterized by Small-angle X-ray Scattering (SAXS) associated with Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. We have synthesized hybrids based on the reaction of PVA with tetraethoxysilane (TEOS). PVA/TEOS hybrids were also modified in the nanometer-scale by crosslinking with glutaraldehyde (GA) during the synthesis involving hydrolysis and condensation of PVA/TEOS network. FTIR spectra showed major vibration bands associated with organic-inorganic chemical groups present in the hybrid composite PVA/TEOS. XRD coupled to FTIR results have indicated the presence of semi-crystalline domains embedded in amorphous PVA matrix. SAXS results were presented as plots with experimental scattering intensity, I(q), as a function of the modulus of the scattering vector, q. SAXS curves showed quite different trend on vector q with the scattering intensity I(q) corresponding to samples PVA, PVA/GA and PVA/TEOS/GA. Pure PVA sample showed a “knee” type curve, with maximum value q=0.04 Å-1. These results have indicated different nano-ordered disperse phases for PVA, PVA/TEOS hybrid and PVA/TEOS/GA chemically crosslinked hybrid.
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Wang, Shangshang, Jun Huang, Xing Zhang, and Jianbo Zhang. "Integrated Thermo-Electric Measurement of Electrospun Nanofiber for Polymer Electrolyte Fuel Cell." ECS Meeting Abstracts MA2022-01, no. 38 (July 7, 2022): 1713. http://dx.doi.org/10.1149/ma2022-01381713mtgabs.
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Polymer electrolyte fuel cell (PEFC), as an efficient hydrogen energy conversion device, has been developed for decades. Catalyst layer (CL), where the oxygen reduction reaction occurs, predominantly determines the performance of PEFC. Since 1889, the mass activity of catalyst layer has been improved for more than three orders of magnitudes, thanks to the invention of PFSA ionomer and highly dispersed catalyst on nano-sized carbon support. In recent years, introducing order into CL is bringing the CL performance to a higher level. The CLs with state-of-the-art performance feature nanofiber structures. One type of is ionomer nanofibers deposited with Pt/C catalyst on the surface, and another type is composite nanofiber containing ionomer, Pt/C catalyst, and binding polymer. Their superior performance may come from the ordered mass transport network and the size effect of nanofiber conductivity. To further improve the CL performance, the structure-property-performance relationship of ionomer nanofibers or composite nanofibers needs to be clarified. In this work, we designed a setup to measure the proton, electron and thermal conductivity as well as the performance of a single ionomer or composite nanofiber. We developed a self-bonding method to fix the nanofiber on the micro-electrode. For proton and electron conductivity measurement, four-probe method was adopted to eliminate the electrical contact resistance and interfacial effect. For thermal conductivity measurement, Raman assisted steady state method was used to directly measure the temperature profile along the nanofiber. So, the measurement error resulting from the thermal contact resistance between the sample and the temperature sensor/heat sink can be eliminated. For performance measurement, three-electrode system was adopted using the Ag/AgCl electrode as the reference electrode and the Zn/ZnCl2 electrode as the counter electrode. We prepared nanofibers with different size, polymer content, and cross-sectional component distribution by controlling the ink recipe and electrospinning parameters. The integrated thermo-electric measurement found that the proton and thermal conductivity of nanofiber are one order of magnitude higher than bulk properties and increases with decreasing fiber radius. This is attributed to the oriented ionic morphology along the nanofiber. Furthermore, a nanofiber model was developed to extract the catalytic activity and gas diffusion coefficient of nanofiber. These characterization and modelling work can provide guidance to the design and optimization of catalyst layer with electrospun ionomer or composite nanofibers.
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Lonergan, Alex, Umair Gulzar, Yan Zhang, and Colm O'Dwyer. "Operando Photonic Stopband Monitoring of Lithium-Ion Battery Electrodes." ECS Meeting Abstracts MA2022-01, no. 1 (July 7, 2022): 112. http://dx.doi.org/10.1149/ma2022-011112mtgabs.
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Research in lithium-ion batteries is often focused on optimising the electrode performance of either the anode1 or cathode2. One common research strategy is to explore alternative electrode material candidates for use as both the anode3 and cathode4. Another approach involves optimising the performance of existing electrode materials through structured electrode architectures with nano-sized features. Incorporating nanostructure into electrode design has reported advantages of shorter ion diffusion lengths and improved rate capability during cycling5. A common and simple technique for introducing nanostructure to electrodes is the use of a photonic crystal template, particularly inverse opal photonic crystals. The porous geometry, highly interconnected material and nano-sized features of the pore walls are all believed to contribute to improved electrochemical performance in inverse opal electrodes6 7. Photonic crystal materials are more than just a structural template and are renowned for their ability to tune the wavelengths of light propagating in the structure8 9. The repeating dielectric material comprising the structure reflects specific wavelengths, known as the photonic bandgap or stopband, depending on the size of the repeating lattice and the refractive index contrast between the composite materials. Tuning the photonic stopband of various inverse opal materials has been extensively studied10 11. Inverse opal battery electrodes have yet to exploit the optical potential of the photonic stopband. Here, we showcase a fundamentally new operando analysis technique for lithium-ion battery electrodes adopting a photonic crystal structure. Visible spectroscopy is used to monitor the presence and position of the photonic stopband of the electrode material during battery cycling, see Figure 1. Capitalizing on the sensitivity of the photonic stopband to lattice size and refractive index contrast, shifts or changes in the optical spectrum can be correlated to the electrode environment and material performance. Several optical effects are observed throughout the cycling process and linked back to the battery performance of the anode. A TiO2 inverse opal anode is reported on here, yet the technique is versatile and should be applicable to a wide range of electrode materials possessing a photonic crystal structure. References Kim, H.; Choi, W.; Yoon, J.; Um, J. H.; Lee, W.; Kim, J.; Cabana, J.; Yoon, W.-S., Exploring Anomalous Charge Storage in Anode Materials for Next-Generation Li Rechargeable Batteries. Chemical Reviews 2020, 120 (14), 6934-6976. Xu, J.; Dou, S.; Liu, H.; Dai, L., Cathode materials for next generation lithium ion batteries. Nano Energy 2013, 2 (4), 439-442. Liang, B.; Liu, Y.; Xu, Y., Silicon-based materials as high capacity anodes for next generation lithium ion batteries. Journal of Power Sources 2014, 267, 469-490. Manthiram, A.; Song, B.; Li, W., A perspective on nickel-rich layered oxide cathodes for lithium-ion batteries. Energy Storage Materials 2017, 6, 125-139. Mahmood, N.; Tang, T.; Hou, Y., Nanostructured Anode Materials for Lithium Ion Batteries: Progress, Challenge and Perspective. Advanced Energy Materials 2016, 6 (17), 1600374. McNulty, D.; Carroll, E.; O'Dwyer, C., Rutile TiO2 Inverse Opal Anodes for Li-Ion Batteries with Long Cycle Life, High-Rate Capability, and High Structural Stability. Advanced Energy Materials 2017, 7 (12), 1602291. McNulty, D.; Geaney, H.; Buckley, D.; O'Dwyer, C., High capacity binder-free nanocrystalline GeO2 inverse opal anodes for Li-ion batteries with long cycle life and stable cell voltage. Nano Energy 2018, 43, 11-21. John, S., Strong localization of photons in certain disordered dielectric superlattices. Phys. Rev. Lett. 1987, 58 (23), 2486-2489. Yablonovitch, E., Inhibited spontaneous emission in solid-state physics and electronics. Phys. Rev. Lett. 1987, 58 (20), 2059-2062. Schroden, R. C.; Al-Daous, M.; Blanford, C. F.; Stein, A., Optical Properties of Inverse Opal Photonic Crystals. Chemistry of Materials 2002, 14 (8), 3305-3315. Lonergan, A.; Hu, C.; O’Dwyer, C., Filling in the gaps: The nature of light transmission through solvent-filled inverse opal photonic crystals. Physical Review Materials 2020, 4 (6), 065201. Figure 1 (a) Schematic diagram of simultaneous electrochemical and optical characterisation techniques for photonic crystal electrodes. (b) Galvanostatic charge/discharge data for a TiO2 inverse opal electrode. (c) Optical spectrum for a TiO2 inverse opal submerged in LiPF6 electrolyte. (d) SEM image showing the ordered structure of a pristine TiO2 inverse opal. (e) Operando optical spectra obtained at 0.5 V intervals during discharge of the TiO2 inverse opal electrode. Figure 1
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Tishkevich, D. I., A. I. Vorobjova, and A. V. Trukhanov. "Thermal Stability of Nano-Crystalline Nickel Electrodeposited into Porous Alumina." Solid State Phenomena 299 (January 2020): 281–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.281.
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Through-pores alumina membranes of 50 μm thickness and 70 × 70 mm size have been fabricated to deposit Ni nanowires by electrochemical processing. Due to highly ordered microstructure of the membranes, the pores were filled by nanowires almost to 100%. The membrane nanowires composite morphology, structure and thermodynamic characteristics have been studied by scanning electron microscopy, atomic-force microscopy, X-ray diffraction and differential thermal analysis. The thermal stability of Ni nanowires into porous alumina template and whole composite was determined.
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Ugo, Cataldi, and Buergi Thomas. "Plasmonic coupling induced by growing processes of metal nanoparticles in wrinkled structures and driven by mechanical strain applied to a polidimethisiloxisilane template." Photonics Letters of Poland 9, no. 2 (July 1, 2017): 45. http://dx.doi.org/10.4302/plp.v9i2.702.
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We report the mechanical control of plasmonic coupling between gold nanoparticles (GNPs) coated onto a large area wrinkled surface of an elastomeric template. Self-assembly and bottom-up procedures, were used to fabricate the sample and to increase the size of GNPs by exploiting the reduction of HAuCl4 with hydroxylamine. The elastic properties of template, the increase of nanostructure size joined with the particular grating configuration of the surface have been exploited to trigger and handle the coupling processes between the nanoparticles. Full Text: PDF ReferencesG. Mie, "Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen", Ann. Phys. 25, 377 (1908) CrossRef U. Kreibig and M. Vollmer, Optical properties of metal cluster, Berlin 1995 CrossRef S. A. Maier, Plasmonics: Fundamentals and Applications, Springer, New York, 2007 CrossRef L. A. Lane, X. Qian, and S. Nie, "SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging", Chem. Rev. 115, 10489-10529 (2015) CrossRef N. Pazos-Perez, W. Ni, A. Schweikart, R. A. Alvarez-Puebla, A. Fery and L. M. Liz-Marzan, "Highly uniform SERS substrates formed by wrinkle-confined drying of gold colloids", Chem. Sci. 1, 174-178P (2010) CrossRef M. Aioub and M. A. El-Sayed, "A Real-Time Surface Enhanced Raman Spectroscopy Study of Plasmonic Photothermal Cell Death Using Targeted Gold Nanoparticles", J. Am. Chem. Soc. 138, 1258-1264 (2016) CrossRef G. Baffou, and R. Quidant, "Thermo-plasmonics: using metallic nanostructures as nano-sources of heat", Laser Photonics Rev. 7, No. 2, 171-187 (2013) CrossRef G. Palermo, U. Cataldi, L. De Sio, T. Beurgi, N. Tabiryan, and C. Umeton, "Optical control of plasmonic heating effects using reversible photo-alignment of nematic liquid crystals", Applied Physics 109, 191906 (2016) CrossRef J. R. Dunklin, G. T. Forcherio, K. R. Berry, Jr., and D. K. Roper, "Gold Nanoparticle Polydimethylsiloxane Thin Films Enhance Thermoplasmonic Dissipation by Internal Reflection", J. Phys. Chem. 118, 7523-7531 (2014) CrossRef Y. Jin, "Engineering Plasmonic Gold Nanostructures and Metamaterials for Biosensing and Nanomedicine", Adv. Mater. 24, 5153-5165 (2012) CrossRef J. H. Lee, Q. Wu, and W. Park, "Metal nanocluster metamaterial fabricated by the colloidal self-assembly", Optics Letters 34, Issue 4, 443-445 (2009) CrossRef R. Pratibha, K. Park, I. I. Smalyukh, and W. Park, "Tunable optical metamaterial based on liquid crystal-gold nanosphere composite", Optics Express 17, Issue 22, 19459-19469 (2009) CrossRef J. Dintinger, S. Mühlig, C. Rockstuhl, and T. Scharf, "A bottom-up approach to fabricate optical metamaterials by self-assembled metallic nanoparticles", Optical Materials Express 2, Issue 3, 269-278 (2012) CrossRef T. Maurer, J. Marae-Djouda, U. Cataldi, A. G., Guillaume Montay, Y. Madi, B. Panicaud, D. Macias, P.-M. Adam, G. Léveque, T. Buergi, and R. Caputo, "The beginnings of plasmomechanics: towards plasmonic strain sensors", Front. Mater. Sci. 9(2) (2015) CrossRef J. N. Anker W. P. Hall, O. Lyandres, N. C. Shah, J. Zhao and R. P. Van Duyne, "Biosensing with plasmonic nanosensors", Nature Materials 7, 442 - 453 (2008) CrossRef M. E. Stewart, C. R. Anderton, L. B. Thompson, J. Maria, S. K. Gray, J. A. Rogers,and R. G. Nuzzo, "Nanostructured Plasmonic Sensors", Chem. Rev. 108, 494-521 (2008) CrossRef P. K. Jain , M. A. El-Sayed, "Plasmonic coupling in noble metal nanostructures", Chemical Physics Letters 487, 153-164 (2010) CrossRef P. K. Jain, W. Huang and M. A. El-Sayed, "On the Universal Scaling Behavior of the Distance Decay of Plasmon Coupling in Metal Nanoparticle Pairs: A Plasmon Ruler Equation", Nano Letters 7, 2080-2088 (2007) CrossRef U. Cataldi, R. Caputo, Y. Kurylyak, G. Klein, M. Chekini, C. Umeton and T. Buergi, "Growing gold nanoparticles on a flexible substrate to enable simple mechanical control of their plasmonic coupling", Journal of Materials Chemistry C 2(37), 7927-7933 (2014). CrossRef S. K. Ghosh and T. Pal, "Interparticle Coupling Effect on the Surface Plasmon Resonance of Gold Nanoparticles: From Theory to Applications", Chem. Rev. 107, 4797 (2007) CrossRef M. K. Kinnan and G. Chumanov, "Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: II. Effect of the Particle Size and Interparticle Distance", J. Phys. Chem. C 114, 7496 (2010) CrossRef X. L. Zhu, S. S. Xiao, L. Shi, X. H. Liu, J. Zi, O. Hansen and N. A. Mortensen, "A stretch-tunable plasmonic structure with a polarization-dependent response", Opt. Express, 20, 5237 (2012) CrossRef K. H. Su, Q. H. Wei, X. Zhang, J. J. Mock, D. R. Smith and S. Schultz, "Interparticle Coupling Effects on Plasmon Resonances of Nanogold Particles", Nano Lett. 3, 1087 (2003) CrossRef Y. L. Chiang, C. W. Chen, C. H. Wang, C. Y. Hsieh, Y. T. Chen, H. Y. Shih and Y. F. Chen, "Mechanically tunable surface plasmon resonance based on gold nanoparticles and elastic membrane polydimethylsiloxane composite", Appl. Phys. Lett. 96, 041904 (2010) CrossRef N. Bowden, W. T. S. Huck, K. E. Paul, and G. M. Whitesides, "The controlled formation of ordered, sinusoidal structures by plasma oxidation of an elastomeric polymer", Appl. Phys. Lett. 75(17) (1999) CrossRef R, A. Lawton, C. R. Price, A. F. Runge, Walter J. Doherty III, S. Scott Saavedra , "Air plasma treatment of submicron thick PDMS polymer films: effect of oxidation time and storage conditions", Colloids and Surfaces A: Physicochem. Eng. Aspects 253, 213-215 (2005). CrossRef A Schweikart, N. Pazos-Perez, R. A. Alvarez-Puebla and A. Fery, "Controlling inter-nanoparticle coupling by wrinkle-assisted assembly", Soft Matter 7, 4093 (2011) CrossRef K. R. Brown, L. A. Lyon, A. P. Fox, B. D. Reiss and M. J. 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Seredin, Pavel V., Dmitry L. Goloshchapov, Kirill A. Nikitkov, Vladimir M. Kashkarov, Yury A. Ippolitov, and Vongsvivut Jitraporn (Pimm). "Применение синхротронной ИК-микроспектроскопии для анализа интеграции биомиметических композитов с нативной твердой тканью зуба человека." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 21, no. 2 (June 14, 2019): 262–77. http://dx.doi.org/10.17308/kcmf.2019.21/764.
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В данной работе продемонстрирована возможность применения ИК-микроспектроскопии для многомерной визуализации и анализа интеграции с нативными твердыми тканями зуба человека нового поколения биомиметических материалов, воспроизводящих минералорганический комплекс эмали и дентина.На основе ИК-картирования интенсивности конкретной функциональной молекулярной группы с использованием синхротронного излучения найдены и визуализированы характеристические особенности биомиметического переходного слоя в межфазной области эмаль/стоматологический материал и определено расположение функциональных групп, отвечающих процессам интеграции биомиметического композита
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Fan, Yuwei, Zhi Sun, and Janet Moradian-Oldak. "Bio-Inspired Nano-Composite Fabrication on Etched Human Enamel Surface." MRS Proceedings 1094 (2008). http://dx.doi.org/10.1557/proc-1094-dd09-01.
Full textAbstract:
AbstractBecause of its significant potential in controlling key steps of apatite mineralization, recombinant amelogenin has been applied in different in vitro systems for the synthesis of uniquely ordered composite material similar to enamel. Here we summarize the results of a series of experiments, in which mineral deposition took place on the exposed surface of enamel from extracted human third molars soaked in calcium phosphate solution, in the presence of amelogenin and fluoride. Analysis of crystal size and morphology revealed that in the presence of both amelogenin (50-100 μg/mL) and fluoride (1 ppm), bundles of oriented rod- like fluoridated apatite crystals were formed creating a dense coating on the enamel substrate. Such organized bundles were not formed at low concentrations of rP172 (< 30 μg/mL). Preparation of such ordered nanocomposites provides a promising approach for development of new generation of dental restorative materials with improved esthetic and mechanical properties.
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Fan, Yuwei, Rizhi Wang, and Janet Moradian-Oldak. "Fabrication of enamel-mimicking mineralization composite coating induced by electrolytic deposition (ELD) system." MRS Proceedings 1008 (2007). http://dx.doi.org/10.1557/proc-1008-t04-01.
Full textAbstract:
AbstractMature tooth enamel does not remodel nor self-repairs after damage. Therefore, in vitro formation of a uniquely ordered composite similar to enamel is of particular interest. In this study we applied a newly developed electrolytic deposition (ELD) system to promote the amelogenin nano-chain self-assembly and simultaneous calcium phosphate crystallization. Composite coatings of amelogenin-calcium phosphate were prepared on a cathode substrate (Si wafer), from an initial pH of 4-5, and calcium and phosphorus containing solution at room temperature. The effects of a recombinant full-length amelogenin (rP172) and truncated protein without the C-terminal (rP148) on the growth and morphology of the calcium phosphate nano-composite were investigated. A potentiostat was used to control the electrochemical parameters.Following the application of electric current, the local pH around the cathode was increased and resulted in the self-assembly of amelogenin that occurred simultaneously with calcium phosphate mineralization. Transmission and scanning electron micrographs of assembled rp172 amelogenin collected from the 25mM sodium phosphate solution during electrodeposition showed uniform nanospheres and nano-chains structures, while the rP148 formed irregular aggregates. SEM observation of the surface of the nano-composite after electrodeposition, revealed organized nano-rod structures in the presence of rP172, while only nano-sized spherical aggregates were seen in the presence of rP148. ATR-IR confirmed that the mineral phases were mainly octacalcium phosphate, but apatite and amorphous calcium phosphate were also present. Nanoindentation was tested on rP172 and rP148 composite coating. The rP172 composite coating exhibited higher elastic modulus and hardness than rP148 composite. The fracture toughness of rP172 composite was comparable to mature enamel. We therefore conclude that the 24 amino acid hydrophilic C-terminal of amelogenin is essential for the self-assembly, and therefore, for calcium phosphate crystal organization. The new electro-deposition system is effective for fabrication of amelogenin/apatite composites with defined organized structures.
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Jiang Mei-Yan. "Study on preparation and electrochemical properties of nano-diamond/vertical graphene composite three-dimensional electrodes." Acta Physica Sinica, 2022, 0. http://dx.doi.org/10.7498/aps.71.20220715.
Full textAbstract:
Diamond/graphene composite three-dimensional electrode has attracted extensive attention because of its low background current and wide potential window of diamond component, and its high electrochemical activity of graphite component. In this paper, by means of hot wire chemical vapor deposition method, nano diamond is embedded in the vertical graphene sheet on the surface of single particle layer of nano diamond by regulating the short-term growth time to form a composite three-dimensional electrode. The results show that the electrode exhibits a wide potential window (3.59 V) and a very low background current (1.27 mA/cm<sup>2</sup>) when nanocrystals grow on the top of the vertical graphene sheet. The composite structure of nanocrystals coated with graphite on the top of the graphene sheet is the key to broaden the potential window and reduce the background current. With the increase of growth time, the vertical lamellae grew and nano-diamond grains were embedded into the lamellae, and a novel nano-diamond/graphene composite vertical lamellae structure was constructed. The ordered graphite structure increases the electrochemical active area to 677.19 μC/cm<sup>2</sup> and the specific capacitance to 627.34 μF/cm<sup>2</sup>. The increase of graphite components makes the potential window narrow, and the embedded nanodiamond effectively reduces the background current. This study provides a new method for preparing three-dimensional nanodiamond/graphene composite electrodes by hot wire chemical vapor deposition, and provides a new idea for fully exploiting the synergistic effect of diamond/graphene composite films.