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Al-Arjan, Wafa Shamsan, Muhammad Umar Aslam Khan, Samina Nazir, Saiful Izwan Abd Razak i Mohammed Rafiq Abdul Kadir. "Development of Arabinoxylan-Reinforced Apple Pectin/Graphene Oxide/Nano-Hydroxyapatite Based Nanocomposite Scaffolds with Controlled Release of Drug for Bone Tissue Engineering: In-Vitro Evaluation of Biocompatibility and Cytotoxicity against MC3T3-E1". Coatings 10, nr 11 (20.11.2020): 1120. http://dx.doi.org/10.3390/coatings10111120.
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Fabrication of reinforced scaffolds to repair and regenerate defected bone is still a major challenge. Bone tissue engineering is an advanced medical strategy to restore or regenerate damaged bone. The excellent biocompatibility and osteogenesis behavior of porous scaffolds play a critical role in bone regeneration. In current studies, we synthesized polymeric nanocomposite material through free-radical polymerization to fabricate porous nanocomposite scaffolds by freeze drying. Functional group, surface morphology, porosity, pore size, and mechanical strength were examined through Fourier Transform Infrared Spectroscopy (FTIR), Single-Electron Microscopy (SEM), Brunauer-Emmet-Teller (BET), and Universal Testing Machine (UTM), respectively. These nanocomposites exhibit enhanced compressive strength (from 4.1 to 16.90 MPa), Young’s modulus (from 13.27 to 29.65 MPa) with well appropriate porosity and pore size (from 63.72 ± 1.9 to 45.75 ± 6.7 µm), and a foam-like morphology. The increasing amount of graphene oxide (GO) regulates the porosity and mechanical behavior of the nanocomposite scaffolds. The loading and sustained release of silver-sulfadiazine was observed to be 90.6% after 260 min. The in-vitro analysis was performed using mouse pre-osteoblast (MC3T3-E1) cell lines. The developed nanocomposite scaffolds exhibited excellent biocompatibility. Based on the results, we propose these novel nanocomposites can serve as potential future biomaterials to repair defected bone with the load-bearing application, and in bone tissue engineering.
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Gerawork, Mekdes. "Remediation of textile industry organic dye waste by photocatalysis using eggshell impregnated ZnO/CuO nanocomposite". Water Science and Technology 83, nr 11 (29.04.2021): 2753–61. http://dx.doi.org/10.2166/wst.2021.165.
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Abstract Heterogeneous photocatalysis using nanocomposites is of great research interest in the treatment of industrial wastewater. The impregnated photocatalyst was produced by liquid state reaction of ZnO/CuO nanocomposite with extracted eggshells. The structure, functional group, metal composition, bandgap, and photocatalytic activity of the nanocomposites were characterized by using X-ray diffraction, Fourier-transform infrared spectroscopy, atomic absorption spectrometry, and UV–Vis spectroscopy, respectively, in the absence and presence of eggshells. Photocatalytic degradation activities of the nanocomposites under UV light irradiation have been tested for a real sewage sample taken from Debre Berhan Textile Industry. From the results, the optimized degradation efficiency of the dye was 97.95% with 0.4 g dose of the photocatalyst, 120 min irradiation time, 120 °C temperature, and pH of 6.7. The results revealed that eggshell impregnated nanocomposite had better catalytic activity than the naked nanocomposite. This is due to the highly porous structure of eggshell biomasses and their sorption characteristics. In conclusion, when nanocomposites are supported by eggshell biomasses, they are excellent photocatalysts and can minimize the contamination of organic dyes from textile effluents.
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Kundana, N., M. Venkatapathy, V. Neeraja, Chandra Sekhar Espenti, Venkata Ramana Jeedi i V. Madhusudhana Reddy. "Effect of Zr-Nanofiller on Structural and Thermal Properties of PVDF-co-HFP Porous Polymer Electrolyte Membranes Doped with Mg2+ Ions". Asian Journal of Chemistry 35, nr 1 (27.12.2022): 99–108. http://dx.doi.org/10.14233/ajchem.2023.26893.
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New poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP)/ZrO2-based nanocomposite porous polymer membranes were prepared with doping of magnesium ions using THF as solvent. These membranes were prepared using the solvent casting technique. The optimal nanofiller (0, 2, 4, 6, 8 and 10% Zr nanopowder) was incorporated into the PVDF-co-HFP/MgTf3/ZrO2 and the incorporation of the nanofiller results in an increase in the porosity of the prepared membranes. The structural, morphological and thermal properties of the nanocomposite porous polymer membranes were also investigated. The structural investigation and the identification of functional groups were accomplished using FTIR technique. X-ray diffraction (XRD) analysis was performed to ascertain the phase of polymer membranes and the phase change that happens upon interaction with nanofiller and Mg2+ ions. Assessment of the nanocomposite porous polymer membrane's morphology and porous structure was performed using a scanning electron microscope (SEM). DSC analysis was used to evaluate the thermal behaviour of the nanocomposite porous membranes. The electrical and dielectric studies confirmed the structural reformation of the polymer electrolyte materials. It was found that 8% nanofiller is the best conducting composition for maximum ionic conductivity, dielectric constant and Mg2+ ion mobility. The incorporation of ZrO2 nanofiller predominantly increases the number of free ions and mobility of the charge carriers in the composite polymer electrolyte systems.
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Madhu, Rajesh, Vediyappan Veeramani, Shen-Ming Chen, Pitchaimani Veerakumar, Shang-Bin Liu i Nobuyoshi Miyamoto. "Functional porous carbon–ZnO nanocomposites for high-performance biosensors and energy storage applications". Physical Chemistry Chemical Physics 18, nr 24 (2016): 16466–75. http://dx.doi.org/10.1039/c6cp01285j.
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Motin, Georgy Yu, i Aleksandr N. Kokatev. "Nanoporous alumina membranes as the basis for functional nanocomposite materials". Transactions of the Kоla Science Centre of RAS. Series: Engineering Sciences 13, nr 1/2022 (27.12.2022): 173–79. http://dx.doi.org/10.37614/2949-1215.2022.13.1.030.
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In the present study, we report about results of obtaining nanocomposite materials based on various types of nanoporous alumina membranes (NAM). The NAM were fabricated by two ways: (I) — using the technique of thinning the barrier layer of porous anodic alumina; (2) — by two-layer galvanostatic electrochemical anodization of aluminium samples. Using atomic force microscopy, it was found that a method of thermal decomposition of K2MnO4 leads to the formation of nanoparticles γ-MnO2 with size ~ 20 nm on the surface and in the pores of NAM, and the use of the method of photochemical synthesis of Ag nanoparticles with a size of ~ 30 nm.
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Lin, Tao, Wenlong Liu, Bin Yan, Jing Li, Yi Lin, Yinghui Zhao, Zheng Shi i Sheng Chen. "Self-Assembled Polyaniline/Ti3C2Tx Nanocomposites for High-Performance Electrochromic Films". Nanomaterials 11, nr 11 (4.11.2021): 2956. http://dx.doi.org/10.3390/nano11112956.
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Electrochromic materials and devices are attracting intense attention because of their low energy consumption and open-circuit memory effect. Considering the difficult processing characteristics of electrochromic conductive polymers, we developed a facile and scalable strategy to prepare solution processable polyaniline (PANI)-based nanocomposites by introducing two-dimensional titanium carbon nanosheets (MXene) through a self-assembly approach. The PANI/MXene nanocomposite can be fabricated into porous films via spray-coating process, which show an obvious synergetic effect of both materials, leading to superior electrochromic properties. The optical contrast of the optimized PANI/MXene film reached as high as 55% at =700 nm, and its response times were 1.3 s for coloration and 2.0 s for bleaching, respectively. In addition, the composite film also showed excellent cycle stability (after 500 cycles, the ΔT retention was above 87%). The improved electrochromic properties are owed to the high conductivity of MXene and the formation of the porous composite film structure, which promote the electronic/ionic transfer and migration efficiency. This research suggests that the self-assembly method and the conductive polymer/MXene nanocomposites have a potential application in the fields of electronic functional films and devices.
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Leontiev, Alexey P., Olga Yu Volkova, Irina A. Kolmychek, Anastasia V. Venets, Alexander R. Pomozov, Vasily S. Stolyarov, Tatiana V. Murzina i Kirill S. Napolskii. "Tuning the Optical Properties of Hyperbolic Metamaterials by Controlling the Volume Fraction of Metallic Nanorods". Nanomaterials 9, nr 5 (14.05.2019): 739. http://dx.doi.org/10.3390/nano9050739.
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Porous films of anodic aluminum oxide are widely used as templates for the electrochemical preparation of functional nanocomposites containing ordered arrays of anisotropic nanostructures. In these structures, the volume fraction of the inclusion phase, which strongly determines the functional properties of the nanocomposite, is equal to the porosity of the initial template. For the range of systems, the most pronounced effects and the best functional properties are expected when the volume fraction of metal is less than 10%, whereas the porosity of anodic aluminum oxide typically exceeds this value. In the present work, the possibility of the application of anodic aluminum oxide for obtaining hyperbolic metamaterials in the form of nanocomposites with the metal volume fraction smaller than the template porosity is demonstrated for the first time. A decrease in the fraction of the pores accessible for electrodeposition is achieved by controlled blocking of the portion of pores during anodization when the template is formed. The effectiveness of the proposed approach has been shown in the example of obtaining nanocomposites containing Au nanorods arrays. The possibility for the control over the position of the resonance absorption band corresponding to the excitation of collective longitudinal oscillations of the electron gas in the nanorods in a wide range of wavelengths by controlled decreasing of the metal volume fraction, is shown.
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Tsou, Chi-Hui, Rui Zeng, Chih-Yuan Tsou, Jui-Chin Chen, Ya-Li Sun, Zheng-Lu Ma, Manuel Reyes De Guzman, Lian-Jie Tu, Xin-Yuan Tian i Chin-San Wu. "Mechanical, Hydrophobic, and Barrier Properties of Nanocomposites of Modified Polypropylene Reinforced with Low-Content Attapulgite". Polymers 14, nr 17 (5.09.2022): 3696. http://dx.doi.org/10.3390/polym14173696.
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Attapulgite (ATT) has never been used as a barrier additive in polypropylene (PP). As a filler, ATT should be added in high content to PP. However, that would result in increased costs. Moreover, the compatibility between ATT and the PP matrix is poor due to the lack of functional groups in PP. In this study, carboxylic groups were introduced to PP to form a modified polypropylene (MPP). ATT was purified, and a low content of it was added to MPP to prepare MPP/ATT nanocomposites. The analysis from FTIR indicated that ATT could react with MPP. According to the results of oxygen and water permeability tests, the barrier performance of the nanocomposite was optimal when the ATT content was 0.4%. This great improvement in barrier performance might be ascribed to the following three reasons: (1) The existence of ATT extended the penetration path of O2 or H2O molecules; (2) O2 or H2O molecules may be adsorbed and stored in the porous structure of ATT; (3) Most importantly, –COOH of MPP reacted with –OH on the surface of ATT, thereby the inner structure of the nanocomposite was denser, and it was less permeable to molecules. Therefore, nanocomposites prepared by adding ATT to MPP have excellent properties and low cost. They can be used as food packaging materials and for other related applications.
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Dzyazko, Yuliya, Ludmila Ponomarova, Yurii Volfkovich, Valentina Tsirina, Valentin Sosenkin, Nadiya Nikolska i Volodimir Belyakov. "Influence of Zirconium Hydrophosphate Nanoparticles on Porous Structure and Sorption Capacity of the Composites Based on Ion Exchange Resin". Chemistry & Chemical Technology 10, nr 3 (15.09.2016): 329–35. http://dx.doi.org/10.23939/chcht10.03.329.
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Evolution of swelling of gel-like strongly acidic resin and organic-inorganic composites based on this ion-exchanger was investigated. Non-aggregated nanoparticles of zirconium hydrophosphate were found to provide size invariability of the polymer pores, which contain functional groups (up to 20 nm), the nanoparticle aggregates squeeze these pores (down to 3 nm). Owing to this, the nanocomposite shows higher break-through capacity during removal of Ni2+ from water, than the sample modified only with aggregates.
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Sun, Dongshu, Minjia Meng, Yao Lu, Bo Hu, Yongsheng Yan i Chunxiang Li. "Porous nanocomposite membranes based on functional GO with selective function for lithium adsorption". New Journal of Chemistry 42, nr 6 (2018): 4432–42. http://dx.doi.org/10.1039/c7nj04733a.
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Li, Xiuli, Jigang Wang, Xin Li, Xiaoqian Hou, Hao Wang, Hui Li i Chunhua Zhang. "A novel design of wound bandage using heparin-polyvinylpyrrolidone/TiO2 nanocomposite to improved antibacterial treatment and burn wound healing effect: In vitro and in vivo evaluation". Materials Express 11, nr 11 (1.11.2021): 1808–18. http://dx.doi.org/10.1166/mex.2021.1877.
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In our current study, porous heparin-polyvinylpyrrolidone/TiO2 nanocomposite (HpPVP/TiO2) bandage were prepared via the incorporation of TiO2 into HpPVP hydrogels for biomedical applications such as burn infection. The effect of the HpPVP hydrogels and the nanoparticles of TiO2 composition on the functional group and the surface properties of the as-fabricated bandages were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD). The presence of TiO2 nanoparticles created the internal structure of the HpPVP hydrogel that aids in a homogeneous porous structure, as indicated by the scanning electron microscope (SEM). The size distribution of the TiO2 nanoparticles was measured using a transmission electron microscope (TEM). The studies on the mechanical properties of the HpPVP hydrogel indicate that the addition of TiO2 nanoparticles increases its strength. The prepared HpPVP/TiO2 nanocomposite dressing has excellent antimicrobial activity were tested against bacterial species (Staphylococcus aureus and Escherichia coli) and has good biocompatibility against human dermal fibroblast cells (HFFF2) for biological applications. In addition, in vivo evaluations in Kunming mice exposed that the as-fabricated HpPVP/TiO2 nanocomposite bandages increased the wound curing and facilitated accelerate skin cell construction along with collagen development. The synergistic effects of the HpPVP/TiO2 nanocomposite hydrogel dressing material, such as its excellent hydrophilic nature, good bactericidal activity, biocompatibility and wound closure rate through in vivo test makes it a suitable candidate for burn infections.
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Hamlehkhan, Azhang, Masoud Mozafari, Nader Nezafati, Mahmoud Azami i Ali Samadikuchaksaraei. "Novel Bioactive Poly(ε-caprolactone)-Gelatin-Hydroxyapatite Nanocomposite Scaffolds for Bone Regeneration". Key Engineering Materials 493-494 (październik 2011): 909–15. http://dx.doi.org/10.4028/www.scientific.net/kem.493-494.909.
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Today, porous nanocomposite scaffolds play a key role in tissue engineering approaches and new processing methods and materials are constantly being developed to cater for the wide range of specifications and requirements. In addition, providing a structural support while maintaining bioactivity is one of the most important goals for these scaffolds, i.e. applying bioceramic into polymeric structures, facilitating the formation of functional tissues. In the last few years, hydroxyapatite (HAp) has been widely investigated as scaffolding material, mainly for its ability to bond to both hard and soft tissues. In this research, new bioactive scaffolds were successfully developed using poly(ε-caprolactone) (PCL), cross-linked gelatin and nanoparticles of HAp. After synthesis of nano HAp powder via chemical precipitation technique, the nanocomposites were prepared through layer solvent casting and lamination techniques. According to the obtained results, the amount of ultimate stress, stiffness and elastic modulus increased by addition of PCL. Also, thein vitrobiocompatibility and cytocompatibility of the scaffolds were tested using mesenchymal stem cells (MSCs), and cells found to be attached to the scaffold walls.
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Fedosyuk, V. M. "Matrices, based on nanostructured porous anodic alumina, for functional applications". Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, nr 1 (2.04.2021): 37–46. http://dx.doi.org/10.29235/1561-8358-2021-66-1-37-46.
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Two-step electrochemical anodization was used for obtaining matrices based on porous anodic alumina (MPAA). Three series of experimental samples were made: 1 – PAAM with thickness 1.3–2.5 μm and 70 nm diameter, 2 – 70.0 μm thickness and 50–75 nm diameter and 3 – 13.5–60.0 μm thickness and 100–200 nm diameter. The pore filling of MPAA was realized using electrochemical deposition. As a result Ni nanopillars, Ni and multilayered Cu/CoNi nanowires were formed. The scanning electron microscopy, vibrating magnetometry, voltammetry techniques and four-probe method were used for experimental samples investigations. The magnetic characteristics of Ni nanowires showed that nanowires in MPAA have ferromagnetic properties, since the coercitivity riches up to 750 kOe and squareness ratio up to 0.65. The study of the electrochemical behavior of the Ti/Al2O3/Ni nanocomposite material in the potential range from –450 to +450 mV in 0.9 % NaCl aqueous solution demonstrated its high corrosion resistance properties. The correlation of the GMR of multilayered Cu/CoNi nanowires to the topological parameters of MPAA, the number of layers, the MPAA and partial layers thickness, and chemical purity has been determined. Thus, it has been demonstrated the prospects of use of matrices based on porous anodic alumina as a base material for the template synthesis of functional ferromagnetic nanomaterials for various practical applications.
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Roddecha, Supacharee, Kantawich Jittmonkong i Malinee Sriariyana. "One-Pot Synthesis of LiFePO4 Nano-Particles Dispersed in N-Containing Melamine-Formaldehyde Carbon Matrix as the Cathode Materials for Large Scale Lithium Ion Batteries". Key Engineering Materials 775 (sierpień 2018): 342–49. http://dx.doi.org/10.4028/www.scientific.net/kem.775.342.
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LiFePO4 is considered as the promising cathode material for a large-scale Li batteries used in electrical vehicles (EVs). However, a practical use of LiFePO4 cathode is limited by its low ionic conductivity, resulting in low battery’s power performance. This work, a facile and practical method to promote ionic conductivity and capacity of LiFePO4 was developed by dispersing LiFePO4 nanoparticles into a porous nitrogen-riched carbon matrix by employing one-pot synthesis approach. The N-containing carbon porous matrix was prepared by utilizing melamine-formaldehyde (MF) resin as the N-containing carbon precursor and Pluronic F127 as the porous template. The pseudo capacitive effect attributed from lone-pair electrons into melamine functional group was expected to support Li ion transport. After carbonization at 600 °C, uniform LiFePO4 nanocomposite clusters with an average size of about 50-300 nm were obtained. The influence of the molar ratio between pluronic F127 and melamine-formaldehyde (i.e. F127:MF molar ratio as 0:1, 0.03:1, 0.3:1) on the LiFePO4 nanocomposite’s morphology and crystalline structure was investigated by using scanning electron microscope and X-ray diffraction technique. The results show that increasing F127 concentrations support more porous structure formation, leading to a higher surface area but does not affect the LiFePO4 nanocrystalline structure. According to the highest surface area, the N-doped carbon coated LiFePO4 composite product obtained from the molar ratio of F127:MF as 0.3:1 exhibited highest discharging specific capacity of 158.1 mAh g-1, at a rate of 0.1 C and also shows high cycle stability.
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Aslam Khan, Muhammad Umar, Wafa Shamsan Al-Arjan, Mona Saad Binkadem, Hassan Mehboob, Adnan Haider, Mohsin Ali Raza, Saiful Izwan Abd Razak, Anwarul Hasan i Rashid Amin. "Development of Biopolymeric Hybrid Scaffold-Based on AAc/GO/nHAp/TiO2 Nanocomposite for Bone Tissue Engineering: In-Vitro Analysis". Nanomaterials 11, nr 5 (17.05.2021): 1319. http://dx.doi.org/10.3390/nano11051319.
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Bone tissue engineering is an advanced field for treatment of fractured bones to restore/regulate biological functions. Biopolymeric/bioceramic-based hybrid nanocomposite scaffolds are potential biomaterials for bone tissue because of biodegradable and biocompatible characteristics. We report synthesis of nanocomposite based on acrylic acid (AAc)/guar gum (GG), nano-hydroxyapatite (HAp NPs), titanium nanoparticles (TiO2 NPs), and optimum graphene oxide (GO) amount via free radical polymerization method. Porous scaffolds were fabricated through freeze-drying technique and coated with silver sulphadiazine. Different techniques were used to investigate functional group, crystal structural properties, morphology/elemental properties, porosity, and mechanical properties of fabricated scaffolds. Results show that increasing amount of TiO2 in combination with optimized GO has improved physicochemical and microstructural properties, mechanical properties (compressive strength (2.96 to 13.31 MPa) and Young’s modulus (39.56 to 300.81 MPa)), and porous properties (pore size (256.11 to 107.42 μm) and porosity (79.97 to 44.32%)). After 150 min, silver sulfadiazine release was found to be ~94.1%. In vitro assay of scaffolds also exhibited promising results against mouse pre-osteoblast (MC3T3-E1) cell lines. Hence, these fabricated scaffolds would be potential biomaterials for bone tissue engineering in biomedical engineering.
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Mubarak, Mahmoud F., Mohamed A. Zayed, Ayman Nafady i Abeer E. L. Shahawy. "Fabrication of Hybrid Materials Based on Waste Polyethylene/Porous Activated Metakaolinite Nanocomposite as an Efficient Membrane for Heavy Metal Desalination Processes". Adsorption Science & Technology 2021 (19.03.2021): 1–15. http://dx.doi.org/10.1155/2021/6695398.
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Hybrid nanostructure materials derived from activated metakaolinite are of growing importance due to their intriguing structural/functional properties and promising biomedical/environmental applications, especially designing desalination membranes. Herein, we report procedures to design and fabricate membranes based on waste polyethylene/porous activated-metakaolinite thin film nanocomposites (WPE/PAMK-TFN). It has been devoted to improving water desalination processes, where efficient removal of trace level (~250 ppm) of toxic heavy metals such as Cd(II), Pb(II), and Cu(II) ions from synthetic wastewater solutions was highly accomplished. Physicochemical techniques such as X-ray diffraction (XRD), surface analysis (BET), and Fourier transform infrared spectroscopy (FTIR) have been extensively employed to elucidate the structure/composition of the prepared nanomaterials. The effect of concentration (0–0.5 wt%) of porous activated-metakaolinite (PAMK) on water permeation was investigated. The results obtained revealed that 0.5 wt% of PAMK clay particles produced the highest dispersion, as evident by SEM images of the nanocomposite membranes. Significantly, the constructed membrane showed marked improvements in porosity, hydrophilicity, and hydraulic resistance. Moreover, elemental mapping studies have confirmed the intercalation of activated bentonite clay within the polymer matrix. The obtained results demonstrated that increased flux and rejection capability of membranes occurred at high clay dosage. In contrast, the low rejection capability was observed at either lower pH and higher initial feed concentrations. Ultimately, for 250 ppm of Cd(II), Pb(II), and Cu(II) ions, the constructed membranes showed maximum removal capability of 69.3%, 76.2%, and 82.5% of toxic cations, respectively.
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Nazir, Arif, Fraz Khalid, Shafiq ur Rehman, Masood Sarwar, Munawar Iqbal, Muhammad Yaseen, Muhammad Iftikhar Khan i Mazhar Abbas. "Structural, electric and dielectric properties of perovskite based nanoparticles for energy applications". Zeitschrift für Physikalische Chemie 235, nr 6 (5.06.2020): 769–84. http://dx.doi.org/10.1515/zpch-2019-1558.
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Abstract A nanocomposite electrode, obtained by combining two high performance perovskite materials, such as lanthanum strontium cobalt ferrite, La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and gadolinium doped ceria, Ce0.85Gd0.15O1.5 (GDC), were investigated as a promising cathode for moderate temperature solid oxide fuel cells (SOFCs). The synthesized material has good conductivity and catalytic performance. The purpose of this synthesis was to prepare a stable and highly performing nanocomposite cathode material. In this research work, LSCF and GDC were separately synthesized by co-precipitation and solid-state reaction method to gain a homogeneous perovskite phase. Varying concentrations of LSCF–GDC composite with GDC (10 wt.%, 20 wt.% and 30 wt.%) were synthesized followed by calcination at 600 °C to remove water content and to achieve an adequate porous structure for oxygen absorption and desorption. These fabricated LSCF, GDC, and the nanocomposite specimens were characterized for microstructure, particle size etc. via. X-ray diffraction method (XRD), scanning electron microscope (SEM) and the laser particle size analyzer. This procedural approach helps to expand new methods for generating bi-functional duel nano-sized perovskites with great performance and stability which can be utilized for advancement of renewable energy sectors especially for rechargeable fuel batteries.
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Almohazey, Dana, Vijaya Ravinayagam, Widyan Alamoudi, Sultan Akhtar, H. Dafalla, Hind Nasser AlSuwaidan, Shoruq T. Almutairi i in. "Insights of Platinum Drug Interaction with Spinel Magnetic Nanocomposites for Targeted Anti-Cancer Effect". Cancers 15, nr 3 (23.01.2023): 695. http://dx.doi.org/10.3390/cancers15030695.
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In nanotherapeutics, gaining insight about the drug interaction with the pore architecture and surface functional groups of nanocarriers is crucial to aid in the development of targeted drug delivery. Manganese ferrite impregnated graphene oxide (MnFe2O4/GO) with a two-dimensional sheet and spherical silica with a three-dimensional interconnected porous structure (MnFe2O4/silica) were evaluated for cisplatin release and cytotoxic effects. Characterization studies revealed the presence of Mn2+ species with a variable spinel cubic phase and superparamagnetic effect. We used first principles calculations to study the physisorption of cisplatin on monodispersed silica and on single- and multi-layered GO. The binding energy of cisplatin on silica and single-layer GO was ~1.5 eV, while it was about double that value for the multilayer GO structure. Moreover, we treated MCF-7 (breast cancer cells) and HFF-1 (human foreskin fibroblast) with our nanocomposites and used the cell viability assay MTT. Both nanocomposites significantly reduced the cell viability. Pt4+ species of cisplatin on the spinel ferrite/silica nanocomposite had a better effect on the cytotoxic capability when compared to GO. The EC50 for MnFe2O4/silica/cisplatin and MnFe2O4/GO/cisplatin on MCF-7 was: 48.43 µg/mL and 85.36 µg/mL, respectively. The EC50 for the same conditions on HFF was: 102.92 µg/mL and 102.21 µg/mL, respectively. In addition, immunofluorescence images using c-caspase 3/7, and TEM analysis indicated that treating cells with these nanocomposites resulted in apoptosis as the major mechanism of cell death.
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Kaipannan, Subramani, P. Anandha Ganesh, Karnan Manickavasakam, Santhoshkumar Sundaramoorthy, Kaviarasan Govindarajan, Sundar Mayavan i Sathish Marappan. "Waste engine oil derived porous carbon/ZnS Nanocomposite as Bi-functional electrocatalyst for supercapacitor and oxygen reduction". Journal of Energy Storage 32 (grudzień 2020): 101774. http://dx.doi.org/10.1016/j.est.2020.101774.
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Al-Senani, Ghadah M., Samerah I. Al-Saeedi, Nada S. Al-Kadhi, Omar H. Abd-Elkader i Nasrallah M. Deraz. "Green Synthesis and Pinning Behavior of Fe-Doped CuO/Cu2O/Cu4O3 Nanocomposites". Processes 10, nr 4 (9.04.2022): 729. http://dx.doi.org/10.3390/pr10040729.
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Egg white-induced auto combustion has been used to synthesize undoped and Fe-doped CuO/Cu2O/Cu4O3 nanocomposites in a soft, secure, and one-pot procedure. X-ray powder diffraction (XRD) and Fourier transform infrared (FTIR) investigations have been used to identify functional groups and the structural properties of crystalline phases present in the as-synthesized composites. Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS) elemental mapping analyses and Transmission Electron Microscopy (TEM) techniques were used to explore the morphological and compositional properties of these composites. N2-adsorption/desorption isotherm models have been used to examine the surface variables of the as-prepared systems. Based on the Vibrating Sample Magnetometer (VSM) technique, the magnetic properties of various copper-based nanocomposites were detected due to being Fe-doped. XRD results showed that the undoped system was composed of CuO as a major phase with Cu2O and Cu4O3 as second phases that gradually disappeared by increasing the dopant content. The crystalline phase’s crystallographic properties were determined. The average particle size was reduced when the synthesized systems were doped with Fe. The construction of porous and polycrystalline nanocomposites involving Cu, Fe, O, and C components was confirmed by SEM/EDS and TEM measurements. In terms of the increase in magnetization of the as-manufactured nanocomposites due to Fe-doping, oxygen vacancies at the surface/or interfacial of nanoparticles, while also domain wall pinning mechanisms, were investigated. Finally, employing the investigated production process, Fe doping of CuO/Cu2O/Cu4O3 nanocomposite resulted in the development of a single phase (CuO) exhibiting “pinned” type magnetization. This is the first publication to show that CuO/Cu2O/Cu4O3.
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Hermosa, Glemarie C., Chien-Shiun Liao, Sea-Fue Wang i Aidan An-Cheng Sun. "Methyl Orange Adsorption onto Magnetic Fe3O4/Carbon (AC, GO, PGO) Nanocomposites". Journal of Nanoscience and Nanotechnology 21, nr 11 (1.11.2021): 5756–64. http://dx.doi.org/10.1166/jnn.2021.19494.
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In this study, carbonaceous nanomaterials (Activated Carbon (AC), Graphene Oxide (GO) and Porous Graphene Oxide (PGO)) were synthesized and attached to Fe3O4 magnetic powder for the effective removal of synthetic Methyl Orange (MO). AC and GO were successfully conjugated with Fe3O4 whilst PGO was not due to its surface functional groups. The morphology and chemical structure of the Fe3O4/Carbon nanocomposites were characterized by the N2 adsorption, Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM) and Vibrating sample magnetometer (VSM). Batch adsorption experiments were performed and showed significant removal efficiency of 90% at the first ten minutes for Fe3O4/AC nanocomposite. Analysis of adsorption equilibrium revealed that AC/Fe3O4 is well fitted with Langmuir model, a homogeneous adsorption having an adsorption capacity of 270 mg/g. The GO/Fe3O4 can fit with both Langmuir and Freundlich models indicating multilayer adsorption on the surface of the adsorbent with an adsorption capacity of 81.9 mg/g. In the case of adsorption kinetics, both adsorbents follow the pseudo second order kinetics model showing high F?2 values. Both adsorbents demonstrated advantageous superparamagnetic properties for their easy recovery from aqueous solutions and prospective applications to toxic removal in water and wastewater.
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Dong, Zheng, Chen Chen, Kaihua Wen, Xiaoyi Zhao, Xihong Guo, Zhongzheng Zhou, Guangcai Chang, Yi Zhang i Yuhui Dong. "A Freestanding Chitin-Derived Hierarchical Nanocomposite for Developing Electrodes in Future Supercapacitor Industry". Polymers 14, nr 1 (4.01.2022): 195. http://dx.doi.org/10.3390/polym14010195.
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Crustacean cuticles are receiving extensive attention for its potential in developing environmentally friendly and high energy density electrodes for supercapacitor applications. In the current work, the demineralized tergite cuticle of mantis shrimp was employed as a precursor for the fabrication porous biochar. The structural benefits of the cuticle, including the hierarchical nanofiber networks, and the interpenetrating pore systems were maximumly retained, providing a high carbon content and specific surface area scaffold. Graphene oxide sheets were deposited across the biochar through the pore canal systems to further increase the conductivity of the biochar, forming a novel freestanding carbon composite. Throughout the modification process, the material products were examined by a range of methods, which showed desired structural, chemical and functional properties. Our work demonstrates that high performance carbon materials can be manufactured using a simple and green process to realize the great potential in energy storage applications.
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Xing, Wendong, Yilin Wu, Jian Lu, Xinyu Lin, Chao Yu, Zeqing Dong, Yongsheng Yan i Chunxiang Li. "Biomass-Based Synthesis of Green and Biodegradable Molecularly Imprinted Membranes for Selective Recognition and Separation of Tetracycline". Nano 15, nr 01 (styczeń 2020): 2050004. http://dx.doi.org/10.1142/s1793292020500046.
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Aggravating environmental problems have driven the unprecedented development of sustainable materials. Treatments of environmental pollutants with biomass-based sustainable materials are catching attention of more researchers. In the present work, a biomass-based strategy was developed to prepare sustainable molecularly imprinted nanocomposite membranes (S-MINMs). Based on this strategy, biomass-activated carbon nanoparticles (ACNPs) as the porous filler were integrated into the porous cellulose acetate (CA)/chitosan (CS) hybrid membranes to synthesize renewable and easy degradable basal membranes. The specific recognition sites were fabricated from simple free radical polymerization method, and using methacrylic acid (MAA) and acrylamide (Am) as functional monomers, we obtain improved adsorption capacity on tetracycline (TC, template molecule). Performance of S-MINMs was evaluated by adsorption isotherm, adsorption kinetics, perm-selectivity, reusability and biodegradability. Results indicated that the as-prepared S-MINMs not only exhibited desirable biodegradability, but also possess superior adsorption and separation performance toward TC (15.99[Formula: see text]mg g[Formula: see text] for adsorption capacity and 4.91 for perms-selectivity factor). The method developed here shows great potential for development of sustainable membranes for selective separation of various pollutants.
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S, Anil Subash, Manjunatha C, Ajit Khosla, R. Hari Krishna i Ashoka S. "Current Progress in Materials, Device Fabrication, and Biomedical Applications of Potentiometric Sensor Devices: A Short Review". ECS Transactions 107, nr 1 (24.04.2022): 6343–54. http://dx.doi.org/10.1149/10701.6343ecst.
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Potentiometric sensor devices are having a wide range of applications in environmental and biomedical fields. This short review aims to provide updates on recent innovations in various nanomaterials as sensing components used in potentiometric sensor devices. The review also covers the various methods and conditions used to develop these sensor nanomaterials with appropriately decorated by functional groups. Reduced graphene oxide along with traditional platinum electrodes is used to monitor algae growth in an aquatic ecosystem. Here, the addition of reduced-graphene increases the selectivity and precision of the potentiometric sensor. The review also describe the fabrication and the mechanism of sensing of carbon composite based glucose sensors, sweat sensors, and pH sensors, which are used for monitoring a human body. Sweat sensors are the ion-sensors which use carbon nanoparticles for high selectivity. Porous graphene oxide is also one of the highly used carbon nanomaterials which show high selectivity towards different types of chemicals under certain conditions. PANI/Graphene/CNT nanocomposite based potentiometric sensor is used to detect hazardous 4-aminophenol in the surrounding area. Using nanocomposite increases the selectivity and gives a high current response in the I-V graph. The granular nature of InVO4 is used in the fabrication of ammonia sensors. Formaldehyde is one of the commonly found adulterations in the food. A biosensor has been fabricated using CNTs-Fe3O4 nanocomposite to detect the formaldehyde in the foods. Finally the review summarizes the merits and limitations of various potentiometric sensors developed for different biomedical applications.
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Kuznetsova, T. S., I. V. Burakova, T. V. Pasko, A. E. Burakov, A. V. Melezhik, E. S. Mkrtchyan, A. V. Babkin, E. A. Neskoromnaya i A. G. Tkachev. "Technology of obtaining nanocomposites for sorption purification of aqueous media". Perspektivnye Materialy 9 (2021): 68–78. http://dx.doi.org/10.30791/1028-978x-2021-9-68-78.
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The paper presents a technique for obtaining a universal composite nanomaterial for effective sorption water purification from pollutants of various chemical nature. The proposed material is a nanocomposite based on reduced graphene oxide modified with a functional organic component — polyaniline, which also includes oxidized carbon nanotubes as a structure former. The use of polyaniline makes it possible to significantly increase the activity and sorption capacity of the developed graphene material. The authors were developed a number of nanocomposites, which differ in the final stage of the pre-prepared hydrogel technology: drying in air (drying oven), freeze drying, drying under supercritical conditions (supercritical fluid — isopropyl alcohol). In addition, the effect of carbonization as an additional stage (T = 800 °C, argon) was studied in the article. The materials surface morphology was evaluated using scanning electron microscopy. The specific surface area and the parameters of the porous space were determined by nitrogen adsorption. The materials specific surface area increases depending on the choice of drying technology for the initial hydrogel (drying oven — 80 m2/g → freeze drying — 180 m2/g → supercritical drying — 290 m2/g), and also increases after the carbonization stage and reaches a value of ~ 350 m2/g. The nanocomposites sorption capacity to the organic dyes (methylene blue (MB) and solar yellow (SY)), as well as to heavy metals (for example, zinc ions) was determined. It was found that the value of MB sorption is up 1380 to 1800 mg/g, for SY — up 159 to 300 mg/g, for zinc — up 31 to 230 mg/g. At the same time, the sample processed under supercritical conditions, followed by carbonization, were shown the best characteristics.
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Rabiee, Navid, Mohammad Rabiee, Soheil Sojdeh, Yousef Fatahi, Rassoul Dinarvand, Moein Safarkhani, Sepideh Ahmadi i in. "Porphyrin Molecules Decorated on Metal-Organic Frameworks for Multi-Functional Biomedical Applications". Biomolecules 11, nr 11 (17.11.2021): 1714. http://dx.doi.org/10.3390/biom11111714.
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Metal–organic frameworks (MOFs) have been widely used as porous nanomaterials for different applications ranging from industrial to biomedicals. An unpredictable one-pot method is introduced to synthesize NH2-MIL-53 assisted by high-gravity in a greener media for the first time. Then, porphyrins were deployed to adorn the surface of MOF to increase the sensitivity of the prepared nanocomposite to the genetic materials and in-situ cellular protein structures. The hydrogen bond formation between genetic domains and the porphyrin’ nitrogen as well as the surface hydroxyl groups is equally probable and could be considered a milestone in chemical physics and physical chemistry for biomedical applications. In this context, the role of incorporating different forms of porphyrins, their relationship with the final surface morphology, and their drug/gene loading efficiency were investigated to provide a predictable pattern in regard to the previous works. The conceptual phenomenon was optimized to increase the interactions between the biomolecules and the substrate by reaching the limit of detection to 10 pM for the Anti-cas9 protein, 20 pM for the single-stranded DNA (ssDNA), below 10 pM for the single guide RNA (sgRNA) and also around 10 nM for recombinant SARS-CoV-2 spike antigen. Also, the MTT assay showed acceptable relative cell viability of more than 85% in most cases, even by increasing the dose of the prepared nanostructures.
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Zhong, Tao, Meisheng Xia, Zhitong Yao i Chenhua Han. "Chitosan/Silica Nanocomposite Preparation from Shrimp Shell and Its Adsorption Performance for Methylene Blue". Sustainability 15, nr 1 (20.12.2022): 47. http://dx.doi.org/10.3390/su15010047.
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In this study, novel chitosan/silica composites with different mass ratios were prepared by in-situ hydrolysis using chitosan (from shrimp shell) as a carrier, triblock copolymer (P123) as the structure-directing agent, and ethyl orthosilicate as a silicon source. These nanocomposites were characterized by different techniques, including the FT-IR, XRD, TGA, SEM, TEM and N2 adsorption–desorption. The results indicated that the morphology and properties of composites changed with the introduction of silica. When the CS/TEOS mass ratio was 0.0775, the CS−2/SiO2 composite displayed a coral-like three-dimensional porous structure with specific surface area of 640.37 m2/g and average pore size of 1.869 nm. The adsorption properties for methylene blue (MB) were investigated as well and the CS−2/SiO2 showed better adsorption performance. The removal rate for MB reached 94.01% with absorbents dosage of 6 g/L, initial concentration of 40 mg/L, initial pH value of 7, temperature of 35 °C, and adsorption time of 40 min. The adsorption process well fitted the Langmuir isothermal model and quasi-second-order adsorption kinetics model. The maximum adsorption capacity for MB was 13.966 mg/g based on Langmuir fitting. The surface functional groups of the composites can play an important role in the adsorption. The adsorption mechanism of CS−2/SiO2 on MB involved electrostatic interaction, hydrogen bonding and functional group complexation. In addition, the prepared chitosan/silica composites showed good reusability at six cycles, making them a promising material in the application of removing dyeing wastewater.
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Menge, Habtamu Gebeyehu, Jin Ok Kim i Yong Tae Park. "Enhanced Triboelectric Performance of Modified PDMS Nanocomposite Multilayered Nanogenerators". Materials 13, nr 18 (18.09.2020): 4156. http://dx.doi.org/10.3390/ma13184156.
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Recently, triboelectric nanogenerators (TENGs) have been widely utilized to address the energy demand of portable electronic devices by harvesting electrical energy from human activities or immediate surroundings. To increase the surface charge and surface area of negative TENGs, previous studies suggested several approaches such as micro-patterned arrays, porous structures, multilayer alignment, ion injections, ground systems and mixing of high dielectric constant materials. However, the preparation processes of these nanocomposite TENGs have been found to be complex and expensive. In this work, we report a simple, efficient and inexpensive modification of poly(dimethylsiloxane) (PDMS) using graphene nanoplatelets (GNPs) fillers and a Na2CO3 template. This GNP-PDMS was chemically bonded using 3-aminopropylethoxysilane (APTES) as a linker with an electrode multilayer made by layer-by-layer deposition of polyvinyl alcohol (PVA) and poly(4-styrene-sulfonic acid) (PSS)-stabilized GNP (denoted as [PVA/GNP-PSS]n). A 33 wt.% Na2CO3 and 0.5 wt.% of GNP into a PDMS-based TENG gives an open-circuit voltage and short-circuit current density of up to ~270.2 V and ~0.44 μA/cm2, which are ~8.7 and ~3.5 times higher than those of the pristine PDMS, respectively. The higher output performance is due to (1) the improved surface charge density, 54.49 μC/m2, from oxygen functional moieties of GNP, (2) high surface roughness of the composite film, ~0.399 μm, which also increased the effective contact area, and (3) reduced charge leakage from chemical bonding of GNP-PDMS and [PVA/GNP-PSS]3 via APTES. The proposed TENG fabrication process could be useful for the development of other high-performance TENGs.
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Aslam Khan, Muhammad Umar, Hassan Mehboob, Saiful Izwan Abd Razak, Mohd Yazid Yahya, Abdul Halim Mohd Yusof, Muhammad Hanif Ramlee, T. Joseph Sahaya Anand, Rozita Hassan, Athar Aziz i Rashid Amin. "Development of Polymeric Nanocomposite (Xyloglucan-co-Methacrylic Acid/Hydroxyapatite/SiO2) Scaffold for Bone Tissue Engineering Applications—In-Vitro Antibacterial, Cytotoxicity and Cell Culture Evaluation". Polymers 12, nr 6 (29.05.2020): 1238. http://dx.doi.org/10.3390/polym12061238.
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Advancement and innovation in bone regeneration, specifically polymeric composite scaffolds, are of high significance for the treatment of bone defects. Xyloglucan (XG) is a polysaccharide biopolymer having a wide variety of regenerative tissue therapeutic applications due to its biocompatibility, in-vitro degradation and cytocompatibility. Current research is focused on the fabrication of polymeric bioactive scaffolds by freeze drying method for nanocomposite materials. The nanocomposite materials have been synthesized from free radical polymerization using n-SiO2 and n-HAp XG and Methacrylic acid (MAAc). Functional group analysis, crystallinity and surface morphology were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) techniques, respectively. These bioactive polymeric scaffolds presented interconnected and well-organized porous morphology, controlled precisely by substantial ratios of n-SiO2. The swelling analysis was also performed in different media at varying temperatures (27, 37 and 47 °C) and the mechanical behavior of the dried scaffolds is also investigated. Antibacterial activities of these scaffolds were conducted against pathogenic gram-positive and gram-negative bacteria. Besides, the biological behavior of these scaffolds was evaluated by the Neutral Red dye assay against the MC3T3-E1 cell line. The scaffolds showed interesting properties for bone tissue engineering, including porosity with substantial mechanical strength, biodegradability, biocompatibility and cytocompatibility behavior. The reported polymeric bioactive scaffolds can be aspirant biomaterials for bone tissue engineering to regenerate defecated bone.
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Nolasco, Jirah Emmanuel T., Elaine Nicole O. Cañeba, Karl Michael V. Edquila, Joel Ian C. Espita i Jem Valerie D. Perez. "Kinetics and Isotherm Studies of Methyl Orange Adsorption Using Polyethyleneimine-Graphene Oxide Polymer Nanocomposite Beads". Key Engineering Materials 801 (maj 2019): 304–10. http://dx.doi.org/10.4028/www.scientific.net/kem.801.304.
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Nanocomposite beads containing 2% chitosan (CS), 2% polyethyleneimine (PEI), and 1,500 ppm graphene oxide (GO) were synthesized for the removal of methyl orange (MO) from water. Characterization of the CS-PEI-GO beads using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) showed favorable adsorbent properties as given by the presence of numerous surface functional groups and a porous structure. Effects of different parameters such as pH, contact time, and initial concentration on the percentage removal of MO and adsorption capacity of the beads were investigated by performing batch adsorption experiments. MO removal of more than 85% was achieved by the beads across a wide pH range. Kinetic studies were performed and a pseudo-second order kinetic equation with R2 of 0.9999 was obtained. Furthermore, adsorption equilibrium data for MO were best described by the Toth isotherm model (R2 = 0.9644), suggesting multilayer adsorption on heterogeneous adsorption sites with a maximum adsorption capacity of 421.51 mg/g. Finally, FTIR and SEM analyses after adsorption confirmed the presence of MO on the surface of the beads and revealed an intact and stable structure. Overall, the excellent adsorption capability and multi-functionality demonstrated in this study show great potential of the synthesized material for wastewater treatment applications.
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Majidi, Rezvan, Mohammad Ramezanzadeh i Bahram Ramezanzadeh. "Developing a dual-functional self-healing nanocomposite utilizing oxidized-multiwall carbon nanotube/highly-porous metal-organic framework (OCNT/ZIF-8) nano-hybrid". Applied Materials Today 32 (czerwiec 2023): 101830. http://dx.doi.org/10.1016/j.apmt.2023.101830.
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Moradian, Jamile Mohammadi, Songmei Wang, Amjad Ali, Junying Liu, Jianli Mi i Hongcheng Wang. "Biomass-Derived Carbon Anode for High-Performance Microbial Fuel Cells". Catalysts 12, nr 8 (13.08.2022): 894. http://dx.doi.org/10.3390/catal12080894.
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Although microbial fuel cells (MFCs) have been developed over the past decade, they still have a low power production bottleneck for practical engineering due to the ineffective interfacial bioelectrochemical reaction between exoelectrogens and anode surfaces using traditional carbonaceous materials. Constructing anodes from biomass is an effective strategy to tackle the current challenges and improve the efficiency of MFCs. The advantage features of these materials come from the well-decorated aspect with an enriched functional group, the turbostratic nature, and porous structure, which is important to promote the electrocatalytic behavior of anodes in MFCs. In this review article, the three designs of biomass-derived carbon anodes based on their final products (i.e., biomass-derived nanocomposite carbons for anode surface modification, biomass-derived free-standing three-dimensional carbon anodes, and biomass-derived carbons for hybrid structured anodes) are highlighted. Next, the most frequently obtained carbon anode morphologies, characterizations, and the carbonization processes of biomass-derived MFC anodes were systematically reviewed. To conclude, the drawbacks and prospects for biomass-derived carbon anodes are suggested.
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Nofitri Da Conceicao Isya, Hindun, Imelda Valadares Marcal i Ruth R. Aquino. "Fabrication and Characterization of PVDF with an Additive of Nanozeolite via Electrospinning and Non-solvent Induced Phase Separation (NIPS) Process". MATEC Web of Conferences 319 (2020): 10002. http://dx.doi.org/10.1051/matecconf/202031910002.
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In this study, polyvinylidene fluoride with an additive of nanozeolite (PVDF/NZ) membranes were prepared, characterized and evaluated. The concentrations of the nanozeolite incorporated into PVDF were varied from 0.25%, 0.50% and 0.75 % with N-methyl-2-pyrrolidone (NMP) as solvent and the corresponding effects of nanozeolite on the polymer matrix were investigated in terms of performance and properties. There are two methods in preparing the membranes, namely: Non-solvent Induced Phase Separation (NIPS) and electrospinning. The hydrophobicity of the membranes was characterized by contact angle, the surface morphology using Scanning Electron Microscopy (SEM), and the mechanical properties by Universal Testing Machine (UTM). The presence of organic and inorganic matter was investigated using Fourier-Transform Infrared (FTIR). The SEM images of both fabricated nanocomposite membranes showed that after the addition of nanozeolite particles into PVDF matrix has affected the surface morphology, flat-sheet resulted decreasing in porous and electrospun resulted less beads and increasing fiber diameter after adding an extra amount of nanozeolite. The chemical bond or molecular structure of flat-sheet and electrospun membranes obtained same functional groups, however the electrospun resulted a high absorption of alkanes. The contact angle of both nanocomposite fabricated membranes exhibited an increasing contact angle, yet the PVDF/0.75NZ of electrospun membrane obtained higher hydrophobic surface compared to others. The result of UTM showed that on flat-sheet, the tensile strength was obtained by pure PVDF membrane while the PVDF/0.25NZ of electrospun membrane was able to achieve an optimum tensile strength. In fact, the tensile strength via NIPS need to be improved.
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Junaidi, Junaidi, Wiwin Sulistiani, Yessi Efridahniar, Indah Pratiwi, Iqbal Firdaus, Posman Manurung i Pulung Karo Karo. "Synthesis and Characterization of Ag/SiO<sub>2</sub> Nanocomposite Based on Rice Husk Silica Using Sol-Gel Method". Journal of Nano Research 78 (17.04.2023): 31–42. http://dx.doi.org/10.4028/p-54swgk.
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In this study, silver-silica (Ag/SiO2) was synthesized using the sol-gel method by silica from rice husks. Silica derived from rice husk waste was previously synthesized using the sol gel method. In addition, the Ag material used in this study was also performed into silver nanoparticles (AgNPs). This method was chosen to obtain an Ag/SiO2 composite with nano size and high purity. AgNPs were synthesized using silver nitrate (AgNO3) by reduction method at 90 °C. The reducing agent and stabilizer used is trisodium citrate. UV-Vis, FTIR, XRD, and SEM-EDX were used for the analysis Ag/SiO2 composites. Uv-Vis analysis results Ag/SiO2 has an absorption peak at a wavelength of 412 nm with a bandgap energy of 2.25 eV. These peaks indicate that AgNPs have formed in the SiO2 membrane. The FTIR results revealed the Si-O-Si bonds which indicated the presence of silica and the Ag-O functional group, and the presence of AgNPs. The results of XRD analysis showed that the silica structure formed was cristobalite and silver crystals in the face center cubic (fcc) shape. The results of the SEM-EDX morphological analysis showed that the Ag/SiO2 nanocomposite was shaped like sharp stone chips and the presence of small granules (granules) with different particle sizes and shapes, slightly porous and the composition of the compounds in the Ag/SiO2 nanocomposite indicated the presence of various chemical elements in the sample, including carbon, oxygen, sodium, silica, and silver.
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Javad Nazarahari, Mohammad, Abbas Khaksar Manshad, Siyamak Moradi, Ali Shafiei, Jagar Abdulazez Ali, S. Sajadi i Alireza Keshavarz. "Synthesis, Characterization, and Assessment of a CeO2@Nanoclay Nanocomposite for Enhanced Oil Recovery". Nanomaterials 10, nr 11 (17.11.2020): 2280. http://dx.doi.org/10.3390/nano10112280.
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In this paper, synthesis and characterization of a novel CeO2/nanoclay nanocomposite (NC) and its effects on IFT reduction and wettability alteration is reported in the literature for the first time. The NC was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDS), and EDS MAP. The surface morphology, crystalline phases, and functional groups of the novel NC were investigated. Nanofluids with different concentrations of 100, 250, 500, 1000, 1500, and 2000 ppm were prepared and used as dispersants in porous media. The stability, pH, conductivity, IFT, and wettability alternation characteristics of the prepared nanofluids were examined to find out the optimum concentration for the selected carbonate and sandstone reservoir rocks. Conductivity and zeta potential measurements showed that a nanofluid with concentration of 500 ppm can reduce the IFT from 35 mN/m to 17 mN/m (48.5% reduction) and alter the contact angle of the tested carbonate and sandstone reservoir rock samples from 139° to 53° (38% improvement in wettability alteration) and 123° to 90° (27% improvement in wettability alteration), respectively. A cubic fluorite structure was identified for CeO2 using the standard XRD data. FESEM revealed that the surface morphology of the NC has a layer sheet morphology of CeO2/SiO2 nanocomposite and the particle sizes are approximately 20 to 26 nm. TGA analysis results shows that the novel NC has a high stability at 90 °C which is a typical upper bound temperature in petroleum reservoirs. Zeta potential peaks at concentration of 500 ppm which is a sign of stabilty of the nanofluid. The results of this study can be used in design of optimum yet effective EOR schemes for both carbobate and sandstone petroleum reservoirs.
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Montoro-Leal, Pablo, Isaac A. M. Frías, Elisa Vereda Alonso, Abdelhamid Errachid i Nicole Jaffrezic-Renault. "A Molecularly Imprinted Polypyrrole/GO@Fe3O4 Nanocomposite Modified Impedimetric Sensor for the Routine Monitoring of Lysozyme". Biosensors 12, nr 9 (5.09.2022): 727. http://dx.doi.org/10.3390/bios12090727.
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Lysozyme (LYS) applications encompass anti-bacterial activity, analgesic, and anti-inflammatory effects. In this work, a porous framework that was based on the polymerization of pyrrole (PPy) in the presence of multi-functional graphene oxide/iron oxide composite (GO@Fe3O4) has been developed. Oxygen-containing and amine groups that were present in the nanocomposite were availed to assembly LYS as the molecularly imprinted polymer (MIP) template. The synthesized material (MIPPy/GO@Fe3O4) was electrodeposited on top of a gold microelectrode array. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to confirm the adequate preparation of GO@Fe3O4, and the characterization of the resulting molecularly imprinted electrochemical sensor (MIECS) was carried out by electrochemical impedance spectrometry (EIS), FT-IR analysis, and scanning electron microscopy (SEM). The impedimetric responses were analyzed mathematically by fitting to a Q(Q(RW)) equivalent circuit and quantitative determination of LYS was obtained in a linear range from 1 pg/mL to 0.1 µg/mL, presenting good precision (RSD ≈ 10%, n = 5) and low limit of detection (LOD = 0.009 pg/mL). The fabrication of this device is relatively simple, scalable, rapid, and economical, and the sensor can be used up to nine times without disintegration. The MIECS was successfully applied to the determination of LYS in fresh chicken egg white sample and in a commercial drug, resulting in a straightforward platform for the routine monitoring of LYS.
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Sari, W., M. Sari i Y. Yusuf. "The cell viability assay analysis and physicochemical characterization of porous hydroxyapatite scaffold using honeycomb and paraffin wax as polymeric porogen for bone tissue engineering". Advances in Natural Sciences: Nanoscience and Nanotechnology 13, nr 1 (1.03.2022): 015013. http://dx.doi.org/10.1088/2043-6262/ac5d43.
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Abstract To fabricate and characterize the porous hydroxyapatite-based scaffold, honeycomb as a natural polymer (HA/HCB) and paraffin wax (HA/Wax) were used. The fabrication of scaffold using the porogen leaching method was varied temperatures between 700, 900, and 1100 °C. Theoretically, the temperature of calcination influenced the morphology of the scaffold, crystallite size, functional group, and porosity. According to the previous study, the crystallite size of the polymer scaffold is less than 100 nm. The HA-based scaffold was analyzed by the Energy Dispersive X-Ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM), X-Ray Diffractometer (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and tested by the cell viability. According to the XRD results, the crystallite size of HA/HCB scaffold decreases, while scaffold HA/Wax crystallite size tends to decrease when calcination temperature increases. As calcination temperature increases, porosity tends to be small for both HA/HCB and HA/wax scaffolds. The scaffold HA/HCB 900 °C has interconnected pores, uniform, and small porosity. In contrast, the scaffold HA/Wax 900 °C has fewer interconnected pores and non-uniform particles. The FTIR result of the HA/HCB 900 °C has C-H functional group, affecting cell viability. Through MTT (3-(4,5-Dimethylthiazol-2-yl)−2,5 diphenyltetrazolium bromide) assays, the cell viability value of the HA/Wax 900 °C was greater than the HA/HCB 900 °C for 48 h incubated time. It is caused by the alkane chains on HA/HCB, causing the death of cells. Considering cell viability assay studies for the nanocomposite scaffold, the obtained results confirm the non-toxicity of the material.
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Thangarasu, Sadhasivam, i Tae-Hwan Oh. "Recent Developments on Bioinspired Cellulose Containing Polymer Nanocomposite Cation and Anion Exchange Membranes for Fuel Cells (PEMFC and AFC)". Polymers 14, nr 23 (1.12.2022): 5248. http://dx.doi.org/10.3390/polym14235248.
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Hydrogen fuel cell (FC) technologies are being worked on as a possible replacement for fossil fuels because they produce a lot of energy and do not pollute the air. In FC, ion-exchange membranes (IEMs) are the vital components for ion transport between two porous electrodes. However, the high production cost of commercialized membranes limits their benefits. Various research has focused on cellulose-based membranes such as IEM with high proton conductivity, and mechanical, chemical, and thermal stabilities to replace the high cost of synthetic polymer materials. In this review, we focus on and explain the recent progress (from 2018 to 2022) of cellulose-containing hybrid membranes as cation exchange membranes (CEM) and anion exchange membranes (AEM) for proton exchange membrane fuel cells (PEMFC) and alkaline fuel cells (AFC). In this account, we focused primarily on the effect of cellulose materials in various membranes on the functional properties of various polymer membranes. The development of hybrid membranes with cellulose for PEMFC and AFC has been classified based on the combination of other polymers and materials. For PEMFC, the sections are associated with cellulose with Nafion, polyaryletherketone, various polymeric materials, ionic liquid, inorganic fillers, and natural materials. Moreover, the cellulose-containing AEM for AFC has been summarized in detail. Furthermore, this review explains the significance of cellulose and cellulose derivative-modified membranes during fuel cell performance. Notably, this review shows the vital information needed to improve the ion exchange membrane in PEMFC and AFC technologies.
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Sorkhabi, Tannaz Soltanolzakerin, Mehrab Fallahi Samberan, Krzysztof Adam Ostrowski, Tomasz M. Majka, Marcin Piechaczek i Paulina Zajdel. "Preparation and Characterization of Novel Microgels Containing Nano-SiO2 and Copolymeric Hydrogel Based on Poly (Acrylamide) and Poly (Acrylic Acid): Morphological, Structural and Swelling Studies". Materials 15, nr 14 (8.07.2022): 4782. http://dx.doi.org/10.3390/ma15144782.
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In this paper, novel microgels containing nano-SiO2 were prepared by in situ copolymerization using nano-SiO2 particles as a reinforcing agent, nanosilica functional monomer (silane-modified nano-SiO2) as a structure and morphology director, acrylamide (AAm) as a monomer, acrylic acid (AAc) as a comonomer, potassium persulfate (KPS) as a polymerization initiator, and N,N′-methylene bis (acrylamide) (MBA) as a crosslinker. In addition, a conventional copolymeric hydrogel based on poly (acrylamide/acrylic acid) was synthesized by solution polymerization. The microgel samples, hydrogel and nanoparticles were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). A FESEM micrograph of copolymeric hydrogel showed the high porosity and 3D interconnected microstructure. Furthermore, FESEM results demonstrated that when nano-SiO2 particles were used in the AAm/AAc copolymerization process, the microstructure and morphology of product changed from porous hydrogel to a nanocomposite microgel with cauliflower-like morphology. According to FESEM images, the copolymerization of AAm and AAc monomers with a nanosilica functional monomer or polymerizable nanosilica particle as a seed led to a microgel with core–shell structure and morphology. These results demonstrated that the polymerizable vinyl group on nano-SiO2 particles have controlled the copolymerization and the product morphology. FTIR analysis showed that the copolymeric chains of polyacrylamide (PAAm) and poly (acrylic acid) (PAAc) were chemically bonded to the surfaces of the nano-SiO2 particles and silane-modified nano-SiO2. The particulate character of microgel samples and the existence of long distance among aggregations of particles led to rapid swelling and increasing of porosity and therefore increasing of degree of swelling.
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Borpatra Gohain, Moucham, Sachin Karki, Diksha Yadav, Archana Yadav, Neha R. Thakare, Swapnali Hazarika, Hyung Keun Lee i Pravin G. Ingole. "Development of Antifouling Thin-Film Composite/Nanocomposite Membranes for Removal of Phosphate and Malachite Green Dye". Membranes 12, nr 8 (7.08.2022): 768. http://dx.doi.org/10.3390/membranes12080768.
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Nowadays polymer-based thin film nanocomposite (TFN) membrane technologies are showing key interest to improve the separation properties. TFN membranes are well known in diverse fields but developing highly improved TFN membranes for the removal of low concentration solutions is the main challenge for the researchers. Application of functional nanomaterials, incorporated in TFN membranes provides better performance as permeance and selectivity. The polymer membrane-based separation process plays an important role in the chemical industry for the isolation of products and recovery of different important types of reactants. Due to the reduction in investment, less operating costs and safety issues membrane methods are mainly used for the separation process. Membranes do good separation of dyes and ions, yet their separation efficiency is challenged when the impurity is in low concentration. Herewith, we have developed, UiO-66-NH2 incorporated TFN membranes through interfacial polymerization between piperazine (PIP) and trimesoyl chloride (TMC) for separating malachite green dye and phosphate from water in their low concentration. A comparative study between thin-film composite (TFC) and TFN has been carried out to comprehend the benefit of loading nanoparticles. To provide mechanical strength to the polyamide layer ultra-porous polysulfone support was made through phase inversion. As a result, outstanding separation values of malachite green (MG) 91.90 ± 3% rejection with 13.32 ± 0.6 Lm−2h−1 flux and phosphate 78.36 ± 3% rejection with 22.22 ± 1.1 Lm−2h−1 flux by TFN membrane were obtained. The antifouling tendency of the membranes was examined by using bovine serum albumin (BSA)-mixed feed and deionized water, the study showed a good ~84% antifouling tendency of TFN membrane with a small ~14% irreversible fouling. Membrane’s antibacterial test against E. coli. and S. aureus. also revealed that the TFN membrane possesses antibacterial activity as well. We believe that the present work is an approach to obtaining good results from the membranes under tricky conditions.
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Kim, Hyong June, Taeyoung Kim, Byung Chan Yang, Sung Eun Jo, Ji-Won Son i Jihwan An. "Reactive Sputtered NiO-YSZ Anode Functional Layer for Thin Film Low-Temperature Solid Oxide Fuel Cell". ECS Meeting Abstracts MA2022-02, nr 47 (9.10.2022): 1766. http://dx.doi.org/10.1149/ma2022-02471766mtgabs.
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Solid oxide fuel cell (SOFC) is one of the most promising next-generation electrochemical energy conversion devices because of its wide choice of fuels, cleanliness and, high efficiency of up to 70-85%( with heat utilization). Recently, low-temperature SOFC (< 600 ℃) has been studied to overcome the limitations of conventional SOFC, e.g., thermal stability, cost, and limited application. However, lowering operated temperature is challenging due to slow charge transfer and ion transport rates. Therefore, SOFC design with thin-film stacks, namely thin-film SOFC (TF-SOFC) fabricated on porous anode support, have been usually adopted for sufficient power density even at this temperature regime. A ceramic-metal composite (cermet) of Ni and YSZ (yttria-stabilized zirconia) is the most common anode or anode functional layer (AFL) material of TF-SOFC, because Ni-YSZ cermet has reasonable cost, chemical stability in a reducing atmosphere at high temperature, and similar thermal expansion coefficient to that of YSZ electrolyte. Various thin-film techniques have been reported for AFL fabrication, e.g., pulsed laser deposition (PLD), RF sputtering, etc. Among those, reactive sputtering method, which uses metal target in controlled gas conditions (e.g., oxygen condition for oxide deposition), is a versatile method to deposit various types of thin films with fast deposition speed (up to > 1um/hr), which is beneficial in manufacturability regarding the usual thickness range of AFL (a few microns). In this study, therefore, we studied physical and chemical properties of nanocomposite Ni-YSZ films fabricated by using the reactive sputtering deposition technique, focusing on the effect of sputter parameters. In particular, Oxygen partial pressure significantly affects deposition speed, surface morphology, composition, electrochemical performance, and thermal durability at 450 ℃. It is shown that excessive O2/Ar partial pressure ratio (> 0.2) significantly reduces the deposition speed by approximately one order of magnitude compared to the lower ratio case. In morphological analysis, O2/Ar partial pressure ratio affect nano-structured of anode, after annealing process at 1200℃ with air. Also, the Ni-YSZ anode sputtered at the environment of O2/Ar partial pressure ratio of 0.1 sample shows the lowest activation resistance when applied to LT-SOFC’s anode. The O2/Ar 0.5 sample shows surface Ni agglomeration due to high NiO-to-metallic Ni ratio.
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Dearnley, P. A., E. Kern i K. L. Dahm. "Wear response of crystalline nanocomposite and glassy Al2O3-SiC coatings subjected to simulated piston ring/cylinder wall tests". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 219, nr 2 (1.04.2005): 121–37. http://dx.doi.org/10.1243/146442005x10300.
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The present paper describes the major part of a recent research investigation whose main purpose was to develop a series of novel functional coatings based on the Al2O3-SiC system that ideally would have a nanocomposite microstructure. Such coatings should be well suited for the wear protection of steel and cast-iron piston rings used in automotive internal combustion engines. Two methods were investigated: (i) plasma spraying and (ii) magnetron sputtering. The former was applied to cast-iron and plain carbon steel, whereas the latter was applied to stainless steel piston rings. The plasma sprayed coatings were porous with a hardness of 900-1150 HV, whereas the sputtered coatings were glassy and dense with a hardness of 701-788 HV. High-speed reciprocation wear tests, which simulate the piston ring/cylinder wall environment, were used to assess all coatings. CKS-36 coated cast-iron rings, one of the more common industry standards for this application, were also evaluated. Results showed these to be the most wear resistant. They were smoothly worn, possibly by a microabrasion wear process. The plasma sprayed coatings displayed two main types of wear surface: rough and smooth. The former were mainly generated by a process of grain or particle pull-out, whereas the latter resulted from a combination of microabrasion and microflaking mechanisms. The use of diamond grinding, for finishing the plasma sprayed coatings, mitigated failure through grain pull-out, but wear rates still remained slightly too high compared with uncoated stainless steel and CKS-36 coated cast-iron rings. Most of the sputtered coatings displayed varying degrees of smooth wear which was mitigated as the coating hardness increased. However, this trend was masked by sporadic coating loss through adhesive and/or cohesive failure. The creation of a gradated sputter coating having a core composition based on the Al2O3-SiC variant containing most Si and C and incorporating a bond layer enriched in Cr, adjacent the substrate, eliminated cohesive and adhesive coating failures. Future work should concentrate on the development and evaluation of sputtered crystalline Al2O3-SiC coatings and HVOF sprayed Al2O3-SiC variants. There may also be significant potential in investigating glassy Al2O3-SiC coatings containing significantly higher quantities of Si and C to those reported here.
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Chung, Sheng-Heng, i Cun-Sheng Cheng. "(Digital Presentation) A Design of Nickel/Sulfur Energy-Storage Materials for Electrochemical Lithium-Sulfur Cells". ECS Meeting Abstracts MA2022-02, nr 4 (9.10.2022): 542. http://dx.doi.org/10.1149/ma2022-024542mtgabs.
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Introduction As one of the next-generation rechargeable battery technologies beyond the lithium-ion chemistry, the lithium-sulfur chemistry enables the low-cost sulfur cathode to generate a high theoretical capacity of 1,675 mAh g-1 (10 times higher capacity than those of lithium-ion battery cathode). It further exhibits a high theoretical energy density of 2,600 Wh kg-1 in lithium-sulfur batteries (2–3 times higher energy density than lithium-ion batteries). However, as reported in recent publications, the development is far from adequate with respect to the high-loading sulfur cathode with high active-material content in building advanced lithium-sulfur batteries with a high energy density. The material challenges result from the use of an insulating sulfur as the active material, which would generate lithium polysulfides that can easily diffuse out from the cathode. The high cathode resistance and fast loss of the active material lead to the poor electrochemical utilization and efficiency of lithium-sulfur battery cathodes. These negative impacts subsequent derive the additional electrochemical challenges. A high amount of conductive and porous substrates is added in the cathode to replace the active material, which results in the limited amount of sulfur in the cathode and further blocks the improvement of designing high-energy-density sulfur cathodes. To address the above-mentioned issues, the research progresses of high-performance sulfur cathodes aim to design functional host for sulfur cathodes with the use of carbon for high conductivity, polymers for high ionic transfer, porous materials for physical polysulfide retention, polar materials for chemical polysulfide adsorption, catalysts for high reaction kinetics, etc. However, metallic materials that naturally have high conductivity, strong polysulfide adsorption capability, and catalytic conversion ability, are rarely reported. This is because metals have the highest density as compared to the aforementioned host materials, which commonly causes an insufficient amount of active material in the cathode and therefore inhibits the design of metal-sulfur nanocomposite in sulfur cathodes. To explore the metal/sulfur nanocomposite as a new research trend in sulfur cathodes, we propose a design for a nickel/sulfur nanocomposite as a novel energy-storage material by the electroless nickel plating method, and discuss its applications in lithium–sulfur battery cathodes. The nickel/sulfur energy-storage material possesses metallic nickel on the surface of the insulating sulfur particles as a result of the reduction of nickel ions during autocatalytic plating. By controlling the synthesis and fabrications conditions, the nickel/sulfur energy-storage material attains adjustable high sulfur contents of 60–95 wt% and adjustable high sulfur loadings of 2–10 mg cm−2 in the resulting cathode. The high-loading cathode with the nickel/sulfur energy-storage material demonstrates high electrochemical utilization and stability, which attains a high areal capacity of 8.2 mA∙h cm−2, an energy density of 17.3 mW∙h cm−2, and a stable cyclability for 100 cycles. Results and Discussion Here, in our presentation, we discuss our novel method for the fabrication of nickel/sulfur energy-storage material as an advanced composite cathode material for exploring battery electrochemistry and battery engineering. We adopt a modified electroless-plating method to synthesize nickel/sulfur energy-storage materials characterized by adjustable high sulfur contents and promising cathode performance. The plated nickel coating provides the nickel/sulfur energy-storage materials with metallic conductivity and polysulfide adsorption ability, which addresses the two major issues of sulfur cathodes.[1,2] Therefore, the nickel/sulfur energy-storage material attains high sulfur contents in the cathode and exhibits a high charge-storage capacity of 1,362 mA∙h g−1 and an excellent cyclability for 100 cycles. Moreover, the nickel/sulfur energy-storage material enables high-loading sulfur cathodes with a sulfur loading of 10 mg cm−2, a high areal capacity of 8.2 mA∙h cm−2, and an energy density of 17.3 mW∙h cm−2. Conclusion In summary, the summary of our nickel/sulfur energy-storage materials presented in this presentation would demonstrate a light-weight metallic nickel coating technique for fast charge transfer and strong polysulfide retention in the sulfur nanocomposites composite sulfur cathode. Moreover, our systematic analysis of the nickel/sulfur energy-storage materials exhibits their achievements in attaining both high electrochemical designs of high sulfur content and loading as well as possessing high energy density and electrochemical stability. References C.-S. Cheng, S.-H. Chung, Chem. Eng. J. 2022, 429, 132257. C.-S. Cheng, S.-H. Chung, Batter. Supercaps 2022, 5, e202100323.
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Rosli, A. R., S. H. Loh i F. Yusoff. "Synthesis and Characterization of Magnetic Fe3O4/Reduced Graphene Oxide and its Application in Determination of Dopamine". Asian Journal of Chemistry 31, nr 12 (16.11.2019): 2785–92. http://dx.doi.org/10.14233/ajchem.2019.22213.
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An electrochemical sensor to determine dopamine in the human body was fabricated based on modified iron oxide/reduced graphene oxide/glassy carbon electrode (Fe3O4/r-GO/GCE). Determination of dopamine is significance nowadays as the abnormal level may cause various mental health diseases as well as Parkinson’s disease. The Fe3O4/r-GO nanocomposite was synthesized via Hummer’s method with a slight modification and characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Brunauer Emmett-Teller (BET). The presence of Fe3O4 onto the surface of r-GO was confirmed by SEM analysis which shows the bulky porous sponge-like structure attached to an exfoliated sheet of r-GO. FTIR analysis proved the presence of the functional group in existing composites via oxidation process of graphene oxide and reduction process of reduced graphene oxide while the crystalline form of Fe3O4/r-GO was determined using XRD analysis. The diffraction peaks index to the cubic phase was noticeable indicating the successful crystallization of the composites. The catalytic activity of bare GCE and modified GCE (Fe3O4/r-GO/ GCE) were observed using electrochemical characterization of cyclic voltammetry, differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) with optimum pH of 7, a concentration of 100 μM, and the scan rate of 250 mV s-1. The observed DPV response linearly depends on dopamine concentration in the range of 20-100 μM, with correlation coefficients of 0.9876. The detection limit obtained for the real sample analysis was found to be 0.569 μM while the limit of quantitation was 1.897 μM. The percentage of recovery, repeatability and reproducibility was 113, 82.81 and 7.19 %, respectively.
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Hassan, Md Mehadi, i Qingye Lu. "Nanoarchitecture of Novel 3D Ion Transferring Channel Containing Composite Solid Polymer Electrolyte Membrane Based on Holey Graphene Oxide and Chitosan Biopolymer". ECS Meeting Abstracts MA2022-01, nr 2 (7.07.2022): 163. http://dx.doi.org/10.1149/ma2022-012163mtgabs.
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In three-dimensional (3D) nanoarchitecture arena, two-dimensional (2D) nanostructured graphene oxide (GO) and its derivatives have been emerged as a promising choice of advanced additive materials due to their outstanding properties: high specific surface area (2630 m2g-1), flexibility, light weight, diverse functionality, super mechanical and thermal stability. Particularly, holey graphene oxide (HGO)—single atom thick unique 2D porous nanosheet is obtained from exfoliation of functional GO—a class of graphene sheet with abundant nanopore in their plane; can potentially be used for designing, fabricating and evaluating advanced 3D nanocomposite materials for the development of demandable renewable energy technologies including next generation of solid-state Li+ and Na+ rechargeable batteries. Having been the most significant, momentous, and effectual commercial energy storage devices over the past decade, however, lithium-ion batteries (LIBs) have some key limitations: flammability, poor thermal, and mechanical stability. To overcome these existing limitations, incorporation of ceramic or polymer-based solid-state electrolytes into the LIBs are being explosively focused by the energy storage research community because of their full solid-state condition and tunable molecular level engineering scope. In this research work, a novel 3D nanocomposite solid polymer electrolyte membrane (SPEM) has been successfully developed based on 2D-HGO and chitosan (CH) biopolymer—naturally occurring only alkaline polysaccharide obtained from industrial shrimp shells, super cheap, nanostructured, non-toxic, completely biodegradable, also abundant in nature. In addition, a facial and cost-effective solution-casting technique has been utilized to fabricate SPEM and applied as a solid-state polymer electrolyte for next generation of flexible and wearable rechargeable LIB technology. To investigate the structural, morphological, thermal, mechanical, and electrochemical performance of as prepared SPEM, so far, a comprehensive characterization has been done with the help of SEM, TEM, XRD, TGA, DSC, FTIR, Raman, elemental analysis, tensile strength test, and electrochemical impedance spectroscopy techniques. The SEM analysis of as-prepared flexible, wearable, free-standing, and super thin (~0.08 mm) SPEM depicts the coherently aligned 2D-HGO nanosheets formed a uniform and strong interconnecting 3D ion transfer channels with the host CH biopolymer. Moreover, 1wt% HGO, almost evenly distributed nanofiller SiO2 particles along with polyvinylpyrrolidone (PVP) polymer binder played an important role to generate better mechanical and electrochemical properties in SPEM. Thus, SPEM exhibited impressive ionic conductivity (6.44 x 10-3 Scm-1 at 23.1 oC and 1.02×10-2 Scm-1 at 70oC), a high level of tensile strength (5.87 MPa) as well as 672% and 93.7% increase of tensile strength than that of without HGO additive and GO based nanocomposite membranes respectively. In fact, very low activation energy (Ea = 0.08 eV) value shows the approval of easy lithium-ion diffusion capability in the SPEM system. In addition, fast ion transfer mechanism in SPEM has been investigated with an in-depth dielectric study that tells us the mainly hopping mechanism is dominating in the novel 3D architecture of SPEM. Besides, the obtained impressive electrochemical and mechanical properties of as-prepared SPEM could assist to understand the further fundamental aspects and impacts of SPEM in the application of LIB technology.
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He, Wenqing, Peng Liu, Jieke Jiang, Meijin Liu, Hualin Li, Jianqiang Zhang, Yan Luo, Hon-Yeung Cheung i Xi Yao. "Development of multifunctional liquid-infused materials by printing assisted functionalization on porous nanocomposites". Journal of Materials Chemistry A 6, nr 9 (2018): 4199–208. http://dx.doi.org/10.1039/c7ta10780c.
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By printing functional inks on the porous nanocomposites composed of polar and non-polar components, a couple of unique features were demonstrated on the developed multifunctional liquid-infused materials.
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Brinker, C. Jeffrey. "Evaporation-Induced Self-Assembly: Functional Nanostructures Made Easy". MRS Bulletin 29, nr 9 (wrzesień 2004): 631–40. http://dx.doi.org/10.1557/mrs2004.183.
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AbstractThe following article is an edited transcript based on the MRS Medalist presentation given by C. Jeffrey Brinker (Sandia National Laboratories and the University of New Mexico) on December 3, 2003, at the Materials Research Society Fall Meeting in Boston. Brinker received the Medal for “his pioneering application of principles of sol-gel chemistry to the self-assembly of functional nanoscale materials.” Nature combines hard and soft materials, often in hierarchical architectures, to obtain synergistic, optimized properties with proven, complex functionalities. Emulating natural designs in robust engineering materials using efficient processing approaches represents a fundamental challenge to materials chemists. This presentation reviews progress on understanding so-called evaporation-induced silica/surfactant self-assembly (EISA) as a simple, general means of preparing porous thin-film nanostructures. Such porous materials are of interest for membranes, low-dielectric-constant (low-k) insulators, and even ‘“nano-valves” that open and close in response to an external stimulus. EISA can also be used to simultaneously organize hydrophilic and hydrophobic precursors into hybrid nanocomposites that are optically or chemically polymerizable, patternable, or adjustable.
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Munonde, Tshimangadzo S., i Philiswa N. Nomngongo. "Nanocomposites for Electrochemical Sensors and Their Applications on the Detection of Trace Metals in Environmental Water Samples". Sensors 21, nr 1 (28.12.2020): 131. http://dx.doi.org/10.3390/s21010131.
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The elevated concentrations of various trace metals beyond existing guideline recommendations in water bodies have promoted research on the development of various electrochemical nanosensors for the trace metals’ early detection. Inspired by the exciting physical and chemical properties of nanomaterials, advanced functional nanocomposites with improved sensitivity, sensitivity and stability, amongst other performance parameters, have been synthesized, characterized, and applied on the detection of various trace metals in water matrices. Nanocomposites have been perceived as a solution to address a critical challenge of distinct nanomaterials that are limited by agglomerations, structure stacking leading to aggregations, low conductivity, and limited porous structure for electrolyte access, amongst others. In the past few years, much effort has been dedicated to the development of various nanocomposites such as; electrochemical nanosensors for the detection of trace metals in water matrices. Herein, the recent progress on the development of nanocomposites classified according to their structure as carbon nanocomposites, metallic nanocomposites, and metal oxide/hydroxide nanocomposites is summarized, alongside their application as electrochemical nanosensors for trace metals detection in water matrices. Some perspectives on the development of smart electrochemical nanosensors are also introduced.
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Rysiakiewicz-Pasek, Ewa, Agnieszka Ciżman, Tatiana Antropova, Yuri Gorokhovatsky, Olga Pshenko, Elena Fomicheva i Irina Drozdova. "An insight into inorganic glasses and functional porous glass-based nanocomposites". Materials Chemistry and Physics 243 (marzec 2020): 122585. http://dx.doi.org/10.1016/j.matchemphys.2019.122585.
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Uskov, Andrei V., Elena V. Charnaya, Aleksandr I. Kuklin, Min Kai Lee, Lieh-Jeng Chang, Yurii A. Kumzerov i Aleksandr V. Fokin. "Ga-In Alloy Segregation within a Porous Glass as Studied by SANS". Nanomaterials 13, nr 8 (13.04.2023): 1357. http://dx.doi.org/10.3390/nano13081357.
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Nanolattices can play the role of templates for metals and metallic alloys to produce functional nanocomposites with particular properties affected by nanoconfinement. To imitate the impact of nanoconfinement on the structure of solid eutectic alloys, we filled porous silica glasses with the Ga-In alloy, which is widely used in applications. Small-angle neutron scattering was observed for two nanocomposites, which comprised alloys of close compositions. The results obtained were treated using different approaches: the common Guinier and extended Guinier models, the recently suggested computer simulation method based on the initial formulae for neutron scattering, and ordinary estimates of the scattering hump positions. All of the approaches predicted a similar structure of the confined eutectic alloy. The formation of ellipsoid-like indium-rich segregates was demonstrated.