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Gotowa bibliografia na temat „Porous Nanocomposite”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Porous Nanocomposite"

Vanin, A. I., Yu A. Kumzerov, V. G. Solov’ev, S. D. Khanin, S. E. Gango, M. S. Ivanova, M. M. Prokhorenko, S. V. Trifonov, A. V. Cvetkov i M. V. Yanikov. "Electrical and Optical Properties of Nanocomposites Fabricated by the Introduction of Iodine in Porous Dielectric Matrices". Glass Physics and Chemistry 47, nr 3 (maj 2021): 229–34. http://dx.doi.org/10.1134/s1087659621030123.

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Abstract The electrical and optical properties of nanocomposite materials fabricated by the dispersion of iodine in porous dielectric matrices of zeolites, zeolite-like aluminum phosphates, opals, asbestos, and porous aluminum oxide are studied. It is demonstrated that the physical properties of the produced nanocomposites depend significantly on the structure of a matrix.

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Kojuch, Luana Rodrigues, Keila Machado de Medeiros, Edcleide Maria Araújo i Hélio de Lucena Lira. "Obtaining of Polyamide 6.6 Plane Membrane Application in Oil-Water Separation". Materials Science Forum 775-776 (styczeń 2014): 460–64. http://dx.doi.org/10.4028/www.scientific.net/msf.775-776.460.

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Nanocomposites are a class of materials formed by hybrids of organic and inorganic materials, where the inorganic phase is dispersed at the nanometer level in a polymeric matrix. Several polymers have been used as matrices for the preparation of polymer / clay nanocomposite, among which, polyamide 6.6, by presenting excellent chemical, thermal and mechanical. The nanocomposites exhibit excellent properties the point of view optical, electrical and barrier, and reduced flammability. In this research, micro-porous membranes were obtained from the polyamide 6.6/argila montmorillonite nanocomposite, in order to verify its application in the separation water / oil. The results obtained by scanning electron microscopy (SEM) showed that the obtained membranes have a dense layer and a porous layer, and that after the test oil-water separation was observed that the relative flow (J/J0) was greater in compositions with 3% clay, 1.5 bar pressure.

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Kowalski, K., i M. Jurczyk. "Porous Magnesium Based Bionanocomposites For Medical Application". Archives of Metallurgy and Materials 60, nr 2 (1.06.2015): 1433–35. http://dx.doi.org/10.1515/amm-2015-0147.

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Abstract In this study, Mg-10 wt.% hydroxyapatite nanocomposites and their scaffolds were synthesized using a combination of mechanical alloying and a powder metallurgy methods. The phase and microstructure analysis was carried out using X-ray diffraction, scanning electron microscopy, and the properties were measured using hardness and corrosion testing apparatus. According to the Scherrer method for XRD profiles, the average size of mechanically alloyed Mg+10 wt. % HA for 20 h powders was of order of 21 nm for Mg. The Vickers hardness of the Mg-10 wt.% HA reached 87 HV0.3. The corrosion resistance of the bulk Mg-10 wt.% HA nanocomposite and its scaffolds was investigated in the Ringer’s solution. The potentiodynamic corrosion resistance tests revealed that the porosity of the Mg-10 wt.% HA nanocomposite scaffolds had no negative effects compared to microcrystalline Mg.

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Dibazar, Zahra Ebrahimvand, Mahnaz Mohammadpour, Hadi Samadian, Soheila Zare, Mehdi Azizi, Masoud Hamidi, Redouan Elboutachfaiti, Emmanuel Petit i Cédric Delattre. "Bacterial Polyglucuronic Acid/Alginate/Carbon Nanofibers Hydrogel Nanocomposite as a Potential Scaffold for Bone Tissue Engineering". Materials 15, nr 7 (28.03.2022): 2494. http://dx.doi.org/10.3390/ma15072494.

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3D nanocomposite scaffolds have attracted significant attention in bone tissue engineering applications. In the current study, we fabricated a 3D nanocomposite scaffold based on a bacterial polyglucuronic acid (PGU) and sodium alginate (Alg) composite with carbon nanofibers (CNFs) as the bone tissue engineering scaffold. The CNFs were obtained from electrospun polyacrylonitrile nanofibers through heat treatment. The fabricated CNFs were incorporated into a PGU/Alg polymeric solution, which was physically cross-linked using CaCl2 solution. The fabricated nanocomposites were characterized to evaluate the internal structure, porosity, swelling kinetics, hemocompatibility, and cytocompatibility. The characterizations indicated that the nanocomposites have a porous structure with interconnected pores architecture, proper water absorption, and retention characteristics. The in vitro studies revealed that the nanocomposites were hemocompatible with negligible hemolysis induction. The cell viability assessment showed that the nanocomposites were biocompatible and supported bone cell growth. These results indicated that the fabricated bacterial PGU/Alg/CNFs hydrogel nanocomposite exhibited appropriate properties and can be considered a new biomaterial for bone tissue engineering scaffolds.

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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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Rozmysłowska-Wojciechowska, Anita, Ewa Karwowska, Michał Gloc, Jarosław Woźniak, Mateusz Petrus, Bartłomiej Przybyszewski, Tomasz Wojciechowski i Agnieszka M. Jastrzębska. "Controlling the Porosity and Biocidal Properties of the Chitosan-Hyaluronate Matrix Hydrogel Nanocomposites by the Addition of 2D Ti3C2Tx MXene". Materials 13, nr 20 (15.10.2020): 4587. http://dx.doi.org/10.3390/ma13204587.

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A recent discovery of the unique biological properties of two-dimensional transition metal carbides (MXenes) resulted in intensive research on their application in various biotechnological areas, including polymeric nanocomposite systems. However, the true potential of MXene as an additive to bioactive natural porous composite structures has yet to be fully explored. Here, we report that the addition of 2D Ti3C2Tx MXene by reducing the porosity of the chitosan-hyaluronate matrix nanocomposite structures, stabilized by vitamin C, maintains their desired antibacterial properties. This was confirmed by micro computed tomography (micro-CT) visualization which enables insight into the porous structure of nanocomposites. It was also found that given large porosity of the nanocomposite a small amount of MXene (1–5 wt.%) was effective against gram-negative Escherichia coli, gram-positive Staphylococcus aureus, and Bacillus sp. bacteria in a hydrogel system. Such an approach unequivocally advances the future design approaches of modern wound healing dressing materials with the addition of MXenes.

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Pavlenko, Mykola, Valerii Myndrul, Gloria Gottardi, Emerson Coy, Mariusz Jancelewicz i Igor Iatsunskyi. "Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications". Materials 13, nr 8 (24.04.2020): 1987. http://dx.doi.org/10.3390/ma13081987.

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In the current research, a porous silicon/zinc oxide (PSi/ZnO) nanocomposite produced by a combination of metal-assisted chemical etching (MACE) and atomic layer deposition (ALD) methods is presented. The applicability of the composite for biophotonics (optical biosensing) was investigated. To characterize the structural and optical properties of the produced PSi/ZnO nanocomposites, several studies were performed: scanning and transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance, and photoluminescence (PL). It was found that the ALD ZnO layer fully covers the PSi, and it possesses a polycrystalline wurtzite structure. The effect of the number of ALD cycles and the type of Si doping on the optical properties of nanocomposites was determined. PL measurements showed a “shoulder-shape” emission in the visible range. The mechanisms of the observed PL were discussed. It was demonstrated that the improved PL performance of the PSi/ZnO nanocomposites could be used for implementation in optical biosensor applications. Furthermore, the produced PSi/ZnO nanocomposite was tested for optical/PL biosensing towards mycotoxins (Aflatoxin B1) detection, confirming the applicability of the nanocomposites.

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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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Bordun, Ihor, Krzysztof Chwastek, Dariusz Całus, Piotr Chabecki, Fedir Ivashchyshyn, Zenoviy Kohut, Anatoliy Borysiuk i Yuriy Kulyk. "Comparison of Structure and Magnetic Properties of Ni/C Composites Synthesized from Wheat Straw by Different Methods". Applied Sciences 11, nr 21 (26.10.2021): 10031. http://dx.doi.org/10.3390/app112110031.

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Synthesis of Ni/C nanostructured composites based on a natural raw material, i.e., wheat straw, is carried out in this work. The synthesis is performed by one- and two-stage methods using NiCl2 as the activating agent. The X-ray diffraction and EDS analyses reveal the presence of metallic nickel in the structure of the composites, whereas magnetic measurements showed that nickel was contained in the porous carbon matrix in the nanoparticle state. For nanocomposites synthesized by the one-stage method, the largest contribution to the formation of the porous structure might be attributed to pores with radii from 5 to 30 nm; for a nanocomposite synthesized in two stages, the pore distribution function exhibits a narrow isolated peak with a maximum of around 2.6 nm. Based on the obtained magnetic data, the coercive force, specific saturation magnetization and nickel content in nanocomposites are calculated. For the measured values of the coercive force, the average size of magnetic moment carriers is determined to be ~100 nm for the two-stage synthesis nanocomposite and ~100 ÷ 110 nm for the one-stage synthesis nanocomposites. The developed Ni/C nanocomposites might be used as a cheap material for energy storage applications or as magnetically controlled adsorbents.

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Rabia, Mohamed, Amira Ben Gouider Trabelsi, Asmaa M. Elsayed i Fatemah H. Alkallas. "Porous-Spherical Cr2O3-Cr(OH)3-Polypyrrole/Polypyrrole Nanocomposite Thin-Film Photodetector and Solar Cell Applications". Coatings 13, nr 7 (12.07.2023): 1240. http://dx.doi.org/10.3390/coatings13071240.

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This study utilized the exceptional optical and electrical properties of polypyrrole (Ppy) to fabricate high-performance optoelectronic devices. The synthesis of the porous-spherical Cr2O3-Cr(OH)3-Ppy/Ppy nanocomposite thin film was achieved by preparing a second thin film of Cr2O3-Cr(OH)3-Ppy on the initial Ppy film using K2Cr2O7 as an oxidant. The nanocomposite’s properties were thoroughly characterized, including XRD and optical absorbance analyses. The XRD analysis showed that the crystalline size of the nanocomposite was 20 nm, while optical absorbance analysis demonstrated that the nanocomposite had a higher absorbance in a wide optical range compared to Ppy nanomaterials, as evidenced by the enhancement in bandgap (Eg) value from 3.33 eV for Ppy to 1.89 eV for Cr2O3-Cr(OH)3-Ppy. The fabricated nanocomposite thin film exhibited excellent light-sensing behavior, as evidenced by the evaluation of Jph values under different light conditions and various monochromatic lights with a detectivity (D) of 3.6 × 106 Jones (at 340 nm). The device demonstrated its potential as a solar cell, with a short circuit current (JSC) of 13 µA and an open circuit voltage (VOC) of 1.91 V. Given the nanocomposite’s low cost, high technical production, and superior optoelectronic properties, it has significant potential for use in commercially available high-tech devices.

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Rozprawy doktorskie na temat "Porous Nanocomposite"

Zhang, Wei. "Controllable growth of porous structures from co-continuous polymer blend". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39608.

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Due to their large internal surface area, microporous materials have been widely used in applications where high surface activity is desired. Example applications are extracellular scaffolds for tissue engineering, porous substrates for catalytic reaction, and permeable media for membrane filtration, etc. To realize these potential applications, various techniques such as TIPS (thermal induced phase separation), particle leaching, and SFF (solid freeform fabrication) were proposed and investigated. Despite of being able to generate microporous for specific applications, these available fabrication techniques have limitations on controlling the inner porous structure and the outer geometry in a cost-effective manner. To address these technical challenges, a systematic study focusing on the generation of microporous structures using co-continuous polymer blend was conducted. Under this topic, five subtopics were explored: 1) generation of gradient porous structures; 2) geometrical confining effect in compression molding of co-continuous polymer blend; 3) microporous composite with high nanoparticle loading; 4) micropatterning of porous structure; 5) simulation strategy for kinetics of co-continuous polymer blend phase coarsening process.

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Glaesemann, Benjamin Paul. "Ovalbumin-Based Scaffolds Reinforced with Cellulose Nanocrystals for Bone Tissue Engineering". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/33905.

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In the field of tissue engineering, a major area of study is developing bone scaffolds that will provide support for osteoblasts. Despite many advances in recent years there is still a significant need for new bio-based 3-D porous scaffolds that possess sufficient initial mechanical properties to prevent immediate failure upon implantation. Ovalbumin (OVA), a glycoprotein from chicken egg whites, has been use to fabricate biodegradable, porous hydrogel bone scaffolds that promote osteoblast attachment and proliferation. Although ovalbumin scaffolds encourage bioactivity and are naturally resorbed into the body after bone regeneration, they are also very fragile. Extremely stiff cellulose nanocrystals (CNCs), derived from wood pulp, can be utilized to reinforce these scaffolds while improving biocompatibility. When chemically modified to incorporate surface amine groups, cellulose nanocrystals become capable of covalently crosslinking with the OVA matrix for improved mechanical resilience. Three concentrations (2, 5, 10 wt. %) of CNCs were incorporated and crosslinked to form nanocomposite scaffolds then were compared to pure OVA scaffolds. After fabrication, pore size morphology was compared between each CNC loading using SEM. The images revealed that the 10 wt. % CNC concentration doubled the pore compared to pure OVA scaffolds. Under high magnification, the CNCs were incorporated into the pore walls, providing a contoured surface. AFM was applied to analyze the topography of OVA with CNCs present. The surfaces laden with CNCs had a higher mean surface roughness, but was insufficient to impact cell behavior. Compression testing was carried out on both Instron and DMA machines to demonstrate any reinforcing effect provided by the CNCs. While the compressive modulus remained constant, the elastic limit and strain increased with CNC loading, indicating a change in the resilience of the reinforced scaffolds. With a MTT Assay, it was shown that MC3T3-E1 preosteoblasts significantly increase in metabolic activity on 2 wt. % films and scaffolds, an indication of proliferation. All scaffolds had a net increase in metabolic activity suggesting overall biocompatibility for OVA scaffolds and those incorporating CNCs. Overall, the 5 wt. % scaffolds had the highest mechanical strength and had a positive cell response.
Master of Science

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Tytarenko, A. I., D. A. Andrusenko, M. V. Isaiev i R. M. Burbelo. "Investigation of Heat Transfer in Nanocomposite Structures “PS-liquid” Using Photoacoustic Method". Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35111.

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The thermal properties of porous silicon and composite «PS-liquid» system have been investigated in this paper. Using the photoacoustic method the values of thermal conductivity of porous silicon and composite systems with liquid have been obtained. It is shown that the value of thermal conductivity «PS-liquid» substantially exceeds the value determined by the model of «parallel structures». The increase of thermal conductivity is due to the improvement of thermal contacts among the crystallites when introducing liquid into the pores. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35111

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Lee, Jung Tae. "Chalcogen-carbon nanocomposite cathodes for rechargeable lithium batteries". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53064.

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Current electrochemical energy storage systems are not sufficient to meet ever-rising energy storage requirements of emerging technologies. Hence, development of alternative electrode materials is inevitable. This thesis aims to establish novel electrode materials demonstrating both high energy and power density with prolonged cycle life derived from fundamental understandings on electrochemical reactions of chalcogens, such as sulfur (S) and selenium (Se). First, the effects of the pore size distribution, pore volume and specific surface area of porous carbons on the temperature-dependent electrochemical performance of S-infiltrated carbon cathodes in electrolytes having different salt concentrations are investigated. Additionally, the carbide derived carbon (CDC) synthesis temperature, electrolyte composition, and electrochemical S utilization have been correlated. The effects of thin Li-ion permeable but polysulfide non-permeable Al2O3 layer coating on the surface of S infiltrated carbon cathode are also examined. Similar with S studies, Se infiltrated ordered meso- and microporous CDC composites are prepared and the correlations between pore structure designing and electrolyte molarity are explored. Finally, this thesis demonstrates a simple process to form a protective solid electrolyte layer on the Se cathode surface in-situ. This technique adopts fluoroethylene carbonate to convert into a layer that remains permeable to Li ions, but prevents transport of polyselenides. As a whole, the correlations of multiple cell parameters, such as the cathode structure, the electrolyte composition, and operating temperature on the performances of lithium-chalcogen batteries are discussed.

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Konduri, Suchitra. "Computational investigations of molecular transport processes in nanotubular and nanocomposite materials". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28281.

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Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Nair, Sankar; Committee Member: Koros, William; Committee Member: Ludovice, Peter; Committee Member: Meredith, Carson; Committee Member: Thio, Yonathan; Committee Member: Zhou, Min.

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Olenych, I. B., O. I. Aksimentyeva i Yu Yu Horbenko. "Electrical Properties of Hybrid Composites Based on Poly(3,4-ethylenedioxythiophene) with ZnO and Porous Silicon Nanoparticles". Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42552.

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The electrical properties of hybrid nanosystem based on poly(3,4 ethylenedioxythiophene) with ZnO and porous silicon nanoparticles were studied by the methods of current-voltage characteristics and thermally stimulated conductivity. The dependence of electrical parameters of hybrid films on their composition has been found. The analysis of the temperature dependences of the composites conductivity in the temperature range of 80-330 К indicates the activation character of charge transfer and presence the trapping of unequilibrium carriers at the porous silicon and ZnO nanoparticle – polymer interface.

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Farghaly, Ahmed A. "Fabrication of Multifunctional Nanostructured Porous Materials". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4189.

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Nanostructured porous materials generally, and nanoporous noble metals specifically, have received considerable attention due to their superior chemical and physical properties over nanoparticles and bulk counterparts. This dissertation work aims to develop well-established strategies for the preparation of multifunctional nanostructured porous materials based on the combination of inorganic-chemistry, organic-chemistry and electrochemistry. The preparation strategies involved one or more of the following processes: sol-gel synthesis, co-electrodeposition, metal ions reduction, electropolymerization and dealloying or chemical etching. The study did not stop at the preparation limits but extended to investigate the reaction mechanism behind the formation of these multifunctional nanoporous structures in order to determine the different factors controlling the nanoporous structures formation. First, gold-silica nanocomposites were prepared and used as a building blocks for the fabrication of high surface area gold coral electrodes. Well-controlled surface area enhancement, film thickness and morphology were achieved. An enhancement in the electrode’s surface area up to 57 times relative to the geometric area was achieved. A critical sol-gel monomer concentration was also noted at which the deposited silica around the gold coral was able to stabilize the gold corals and below which the deposited coral structures are not stable. Second, free-standing and transferable strata-like 3D porous polypyrrole nanostructures were obtained from chemical etching of the electrodeposited polypyrrole-silica nanocomposite films. A new reaction mechanism was developed and a new structural directing factor has been discovered for the first time. Finally, silver-rich platinum alloys were prepared and dealloyed in acidic medium to produce 3D bicontinuous nanoporous platinum nanorods and films with a nanoporous gold-like structure. The 3D-BC-NP-Pt displayed high surface area, typical electrochemical sensing properties in an aqueous medium, and exceptional electrochemical sensing capability in a complex biofouling environment containing fibrinogen. The 3D-BC-NP-Pt displayed high catalytic activity toward the methanol electro-oxidation that is 30 times higher that of planar platinum and high volumetric capacitance of 400 F/cm3. These findings will pave the way toward the development of high performance and reliable electrodes for catalysis, sensing, high power outputs fuel cells, battery-like supercapacitors and miniaturized device applications.

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Hong, Jung Ki. "Bioactive Cellulose Nanocrystal Reinforced 3D Printable Poly(epsilon-caprolactone) Nanocomposite for Bone Tissue Engineering". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/73353.

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Polymeric bone scaffolds are a promising tissue engineering approach for the repair of critical-size bone defects. Porous three-dimensional (3D) scaffolds play an essential role as templates to guide new tissue formation. However, there are critical challenges arising from the poor mechanical properties and low bioactivity of bioresorbable polymers, such as poly(epsilon-caprolactone) (PCL) in bone tissue engineering applications. This research investigates the potential use of cellulose nanocrystals (CNCs) as multi-functional additives that enhance the mechanical properties and increase the biomineralization rate of PCL. To this end, an in vitro biomineralization study of both sulfuric acid hydrolyzed-CNCs (SH-CNCs) and surface oxidized-CNCs (SO-CNCs) has been performed in simulated body fluid in order to evaluate the bioactivity of the surface functional groups, sulfate and carboxyl groups, respectively. PCL nanocomposites were prepared with different SO-CNC contents and the chemical/physical properties of the nanocomposites were analyzed. 3D porous scaffolds with fully interconnected pores and well-controlled pore sizes were fabricated from the PCL nanocomposites with a 3D printer. The mechanical stability of the scaffolds were studied using creep test under dry and submersion conditions. Lastly, the biocompatibility of CNCs and 3D printed porous scaffolds were assessed in vitro. The carboxyl groups on the surface of SO-CNCs provided a significantly improved calcium ion binding ability which could play an important role in the biomineralization (bioactivity) by induction of mineral formation for bone tissue engineering applications. In addition, the mechanical properties of porous PCL nanocomposite scaffolds were pronouncedly reinforced by incorporation of SO-CNCs. Both the compressive modulus and creep resistance of the PCL scaffolds were enhanced either in dry or in submersion conditions at 37 degrees Celsius. Lastly, the biocompatibility study demonstrated that both the CNCs and material fabrication processes (e.g., PCL nanocomposites and 3D printing) were not toxic to the preosteoblasts (MC3T3 cells). Also, the SO-CNCs showed a positive effect on biomineralization of PCL scaffolds (i.e., accelerated calcium or mineral deposits on the surface of the scaffolds) during in vitro study. Overall, the SO-CNCs could play a critical role in the development of scaffold materials as a potential candidate for reinforcing nanofillers in bone tissue engineering applications.
Ph. D.

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Dhanya, P. "Synthesis and natural polymer precursor derived hierarchically porous conducting carbon and its Co3O4-based nanocomposite for electrochemical energy storage applications". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2015. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/5867.

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Ma, Hongfeng. "Étude numérique de la micro et nano structuration laser de matériaux poreux nanocomposites". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES001.

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Cette thèse porte sur les simulations numériques de l’interaction laser avec des matériaux poreux. Une possibilité de traitement bien contrôlé est particulièrement importante pour la microstructuration laser du verre poreux et le nano-usinage de matériaux poreux semiconducteurs en présence de nanoparticules métalliques. La modélisation auto-cohérente se concentre donc sur une étude détaillée des processus impliqués. En particulier, pour comprendre les structures des micro-vides périodiques produits à l’intérieur du verre poreux par des impulsions laser femtoseconde, une analyse thermodynamique numérique détaillée a été réalisée. Les résultats des calculs montrent la possibilité de contrôler le micro-usinage laser en volume de SiO2 . De plus, les dimensions des structures densifiées par laser sont examinées pour différentes conditions de focalisation à de faibles énergies d’impulsion. Les dimensions caractéristiques obtenues à partir des structures sont corrélées avec les résultats expérimentaux. Comparés au verre poreux, les films mésoporeux TiO2 chargés d’ions Ag et de nanoparticules supportent des ré- sonances plasmoniques localisées. Les films nanocomposites obtenus sont capables de transférer des électrons libres et d’absorber l’énergie laser de manière résonnante, offrant des possibilités supplémentaires pour contrôler la taille des nanoparticules d’Ag. Pour identifier les paramètres optimaux du laser à onde continue, un modèle multi-physique prenant en compte la croissance des nanoparticules d’Ag, photo-oxydation, réduction a été développé. Les simulations réalisées montrent que la vitesse d’écriture laser contrôle la taille des nanoparticules d’Ag. Les calculs ont également représenté une nouvelle vision selon laquelle les nanoparticules d’Ag se développent devant le centre du faisceau laser du fait de la diffusion de chaleur. Il a été démontré que la croissance rapide activée thermiquement suivie d’une photo-oxydation est la principale raison du changement de taille et de température en fonction de la vitesse d’écriture. Un modèle tridimensionnel a été développé et reproduit les lignes écrites au laser. L’écriture de films mésoporeux TiO2 chargés de nanoparticules d’Ag par un laser pulsé promet également d’offrir des possibilités supplémentaires dans la génération de deux types de nanostructures: les rainures de surface périodiques induites par laser (LIPSS) et les nanogratings Ag à l’intérieur du film TiO2 . Pour mieux comprendre les effets d’un laser pulsé, deux modèles multiimpulsions - un semi-analytique et un autre basé sur une méthode par éléments finis (FEM) - sont développés pour simuler la croissance des nanoparticules d’Ag. Le modèle FEM s’avère précis car il traite mieux la diffusion de la chaleur à l’intérieur des films minces TiO2 . Le modèle pourrait être étendu à l’avenir pour comprendre la formation de nanogratings LIPSS et Ag dans de tels milieux en les couplant avec les migrations de nanoparticules, la fusion de surface et l’hydrodynamique.Les résultats obtenus ont ouvert de nouvelles perspectives sur le microtraitement laser des matériaux poreux et un meilleur contrôle laser sur la nanostructuration dans les films semiconducteurs poreux chargés de nanoparticules métalliques
This thesis is focused on numerical simulations of the laser interaction with porous materials. A possibility of well-controlled processing is particularly important for the laser based micro-structuring of porous glass and nano-machining of semiconducting porous materials in the presence of metallic nanoparticles. The self-consistent modeling is, therefore, focused on a detailed investigation of the involved processes. Particularly, to understand the periodic micro-void structures produced inside porous glass by femtosecond laser pulses, a detailed numerical thermodynamic analysis was performed. The calculation results show the possibility to control laser micro-machining in volume of SiO2 . Furthermore, the dimensions of laser-densified structures are examined for different focusing conditions at low pulse energies. The obtained characteristic dimensions of the structures correlate with the experimental results. Comparing to the porous glass, the mesoporous TiO2 films loaded by Ag ions and nanoparticles support localized plasmon resonances. The resulted nanocomposite films are capable to transfer free electrons and to resonantly absorb laser energy providing additional possibilities in controlling Ag nanoparticle size.To identify the optimum parameters of the continuous-wave laser, a multi-physical model considering Ag nanoparticle growth, photo-oxidation, reduction was developed. The performed simulations show that the laser writing speed controls the Ag nanoparticles size. The calculations also depicted a novel view that Ag nanoparticles grow ahead of the laser beam center due to the heat diffusion. The thermally activated fast growth followed by the photo-oxidation was found to be the main reason for the writing speed dependent sizechange and temperature rises. A three-dimensional model was developed and reproduced the laser written lines.Writing of mesoporous TiO2 films loaded with Ag nanoparticles by a pulsed laser is, furthermore, promising to provide additional possibilities in the generation of two kinds of nanostructures: laser induced periodic surface grooves (LIPSS) and Ag nanogratingsinside the TiO2 film. To better understand the effects of a pulsed laser, two multi-pulses models - one semi-analytic and another one based on a finite element method (FEM) are developed to simulate the Ag nanoparticle growth. The FEM model is shown to be precise because it better treats heat diffusion inside the TiO2 thin films. The model could be extended in future to understand the formation of LIPSS and Ag nanogratings in such media by coupling with nanoparticle migrations, surface melting and hydrodynamics. The obtained results provided new insights into laser micro-processing of porous material and better laser controlling over nanostructuring in porous semiconducting films loaded with metallic nanoparticles

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Książki na temat "Porous Nanocomposite"

Yavuz, C. T. Porous Materials and Nanocomposites for Catalysis. Wiley & Sons, Limited, John, 2022.

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Thomas, Sabu, Claudio Paoloni i Avinash R. Pai. Porous Nanocomposites for Electromagnetic Interference (EMI) Shielding. Elsevier Science & Technology, 2023.

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Thomas, Sabu, Claudio Paoloni i Avinash R. Pai. Porous Nanocomposites for Electromagnetic Interference (EMI) Shielding. Elsevier Science & Technology, 2022.

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Tailored Organic-Inorganic Materials. Wiley, 2015.

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ón, Jorge L., Abraham Clearfield i Ernesto Brunet. Tailored Organic-Inorganic Materials. Wiley & Sons, Limited, John, 2015.

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Clearfield, Abraham, Ernesto Brunet i Jorge L. Ã³n. Tailored Organic-Inorganic Materials. Wiley & Sons, Incorporated, John, 2015.

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Części książek na temat "Porous Nanocomposite"

Girija, E. K., G. Suresh Kumar, A. Thamizhavel, Y. Yokogawa i S. Narayana Kalkura. "Fabrication of Hydroxyapatite-Calcite Nanocomposite". W Advances in Bioceramics and Porous Ceramics IV, 1–11. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095263.ch1.

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Chen, D., i L. Zhang. "Harmonic Vibration of Inclined Porous Nanocomposite Beams". W Lecture Notes in Civil Engineering, 497–501. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_52.

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AbstractThis work investigated the linear harmonic vibration responses of inclined beams featured by closed-cell porous geometries where the bulk matrix materials were reinforced by graphene platelets as nanofillers. Graded and uniform porosity distributions combined with different nanofiller dispersion patterns were applied in the establishment of the constitutive relations, in order to identify their effects on beam behavior under various harmonic loading conditions. The inclined beam model comprised of multiple layers and its displacement field was constructed using Timoshenko theory. Forced vibration analysis was conducted to predict the time histories of mid-span deflections, considering varying geometrical and material characterizations. The findings may provide insights into the development of advanced inclined nanocomposite structural components under periodic excitations.

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Rysiakiewicz-Pasek, E., R. Poprawski, A. Ciżman i A. Sieradzki. "Nanocomposite Materials – Ferroelectric Nanoparticles Incorporated into Porous Matrix". W NATO Science for Peace and Security Series B: Physics and Biophysics, 171–81. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4119-5_16.

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Sangeetha, K., S. N. Kalkura, Y. Yokogawa, A. Thamizhavel i E. K. Girija. "Novel Porogen Free Porous Hydroxyapatite–Gelatin Nanocomposite: Synthesis and Characterization". W Springer Proceedings in Physics, 399–407. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34216-5_39.

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Li, Wenle, Kathy Lu i John Y. Walz. "Freezing Behavior and Properties of Freeze Cast Kaolinite-Silica Porous Nanocomposite". W Ceramic Transactions Series, 57–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144602.ch6.

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Duan, Bin, William W. Lu i Min Wang. "Selective Laser Sintered Ca-P/PHBV Nanocomposite Scaffolds with Sustained Release of rhBMP-2 for Bone Tissue Engineering". W Advances in Bioceramics and Porous Ceramics IV, 37–48. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095263.ch5.

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Ghosh, G., A. Vílchez, J. Esquena, C. Solans i C. Rodríguez-Abreu. "Preparation of Porous Magnetic Nanocomposite Materials Using Highly Concentrated Emulsions as Templates". W Trends in Colloid and Interface Science XXIV, 161–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19038-4_29.

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Ganguly, Sayan. "Role of Porous MXenes". W MXene Nanocomposites, 153–76. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003281511-8.

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Granitzer, Petra, i Klemens Rumpf. "Ferromagnetism and Ferromagnetic Nanocomposites". W Handbook of Porous Silicon, 1–10. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04508-5_30-1.

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Granitzer, Petra, i Klemens Rumpf. "Ferromagnetism and Ferromagnetic Silicon Nanocomposites". W Handbook of Porous Silicon, 1–12. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-04508-5_30-2.

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Streszczenia konferencji na temat "Porous Nanocomposite"

Rizvi, Reza, Hani Naguib i Elaine Biddiss. "Characterization of a Porous Multifunctional Nanocomposite for Pressure Sensing". W ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8178.

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This study focuses on the characterization of a porous multifunctional elastomer-CNT nanocomposites for potential use as pressure sensors. A thermoplastic polyurethane (TPU) was chosen as an elastomeric matrix, which was reinforced with multiwall carbon nanotubes (0–10 wt%) by high shear twin screw extrusion mixing. Porosity was introduced to the composites through the phase separation of a single TPU-CO2 solution. Interactions between MWNT and TPU were elucidated through calorimetry, gravimetric decomposition, conductivity measurements and microstructure imaging. The piezoresistance (pressure-resistance) behavior of the nanocomposites was investigated and found to be dependent on MWNT concentration and nanocomposite microstructure.

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Kleps, Irina, Mihaela Miu, Mihai Danila, Monica Simion, Teodora Ignat, Adina Bragaru, Lucia Dumitru i Gabriela Teodosiu. "Silver/Porous Silicon (PS) Nanocomposite Layers for Biomedical Applications". W 2006 International Semiconductor Conference. IEEE, 2006. http://dx.doi.org/10.1109/smicnd.2006.283935.

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TOMOV, A. V., i V. G. HUZOUSKI. "METHYL RED-POROUS GLASS NANOCOMPOSITE ELEMENTS FOR OPTICAL AMMONIA SENSORS". W Reviews and Short Notes to Nanomeeting-2005. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701947_0136.

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Hassanin, Hany, Ali Mohammadkhani i Kyle Jiang. "Ceramic nanocomposite by electrodeposition of nickel into porous alumina matrix". W 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6322042.

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Tkachenko, Georgiy V., Igor A. Sukhoivanov, Oleksiy V. Shulika i Volodymyr Tkachenko. "Tunable optical filter based on nanocomposite (liquid crystal)/(porous silicon)". W SPIE OPTO, redaktor Liang-Chy Chien. SPIE, 2012. http://dx.doi.org/10.1117/12.909380.

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Behdinan, Kamran, i Rasool Moradi-Dastjerdi. "Electro-Mechanical Behavior of Smart Sandwich Plates With Porous Core and Graphene-Reinforced Nanocomposite Layers". W ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10796.

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Abstract The use of piezoelectric sensor and/or actuator layers in engineering structures provides smart sandwich structures with adaptive responses. Moreover, due to the brittle behavior of piezoceramic materials, inserting nanocomposite and porous layers between piezoelectric layers offers more flexible and lighter structures along with maintaining the advantages of nanocomposite materials. Therefore, in this paper, we have proposed smart sandwich plates consisting of a porous polymeric core and two graphene-reinforced composite (GRC) layers integrated with two piezoceramic layers. The distributions of porosities and randomly oriented graphene particles are assumed to be functionally graded (FG) along the thickness of core and nanocomposite layers, respectively. For the static behavior of the proposed sandwich plates, the coupled electro-mechanical governing equation has been extracted by minimizing potential energy equation with respect to displacement and electrical potential. The governing equation has been discretized by adopting a higher order shear deformation theory (HSDT) of plates and a developed mesh-free method. Using the developed solution framework, the effects of porosity and graphene characteristics, electromechanical loads, and layer thicknesses on the deflection behavior of the proposed FG piezoelectric porous nanocomposite sandwich plates (FG-PPNSPs) have been studied.

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Xue, Tao, Xiao-yi Lv, Zhen-hong Jia, Jun-wei Hou i Ji-kang Jian. "Formation and characterization of ZnS/CdS nanocomposite materials into porous silicon". W Asia Pacific Optical Communications, redaktorzy Yi Luo, Jens Buus, Fumio Koyama i Yu-Hwa Lo. SPIE, 2008. http://dx.doi.org/10.1117/12.803101.

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Fedorin, Illia V. "Dyakonov Surface Waves at the Interface between Porous Nanocomposite and Hypercrystal". W 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2018. http://dx.doi.org/10.1109/mmet.2018.8460289.

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Sun, Jingyu, Shang Wang i Hongjun Wang. "Hollow porous platinum-based nanocomposite for combined tumor therapy (Conference Presentation)". W Colloidal Nanoparticles for Biomedical Applications XVIII, redaktorzy Marek Osiński i Antonios G. Kanaras. SPIE, 2023. http://dx.doi.org/10.1117/12.2651012.

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Xiaoyong, Pan, Du Yanyan, Wang Lian, Lei Chuntang, Zhou Gang i Zhou Bing. "Particle-Stabilized High Internal Phase Emulsions as Templates for Porous Nanocomposite Materials". W 2012 Third International Conference on Digital Manufacturing and Automation (ICDMA). IEEE, 2012. http://dx.doi.org/10.1109/icdma.2012.143.

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