The Experts below are selected from a list of 15684 Experts worldwide ranked by ideXlab platform
Nicola Pinna - One of the best experts on this subject based on the ideXlab platform.
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sensing behavior of sno2 reduced graphene Oxide Nanocomposites toward no2
Sensors and Actuators B-chemical, 2013Co-Authors: G Neri, Salvatore Leonardi, M Latino, N Donato, Seunghwan Baek, Donato E Conte, Patricia A Russo, Nicola PinnaAbstract:Abstract Crystalline SnO2/reduced graphene Oxide (RGO) Nanocomposites were synthesized by a one-pot microwave-assisted non-aqueous sol–gel method, in which partially reduction of the graphene Oxide and nanoparticle formation occurs simultaneously. Composite samples with different SnO2 loadings on the RGO were prepared and characterized by TEM, XRD, TGA-DSC and FT-IR. Chemoresistive devices, consisting of a thick layer of the samples synthesized on alumina substrates provided with Pt interdigitated electrodes, were fabricated and their electrical and NO2 sensing characteristics investigated. The results obtained have shown the possibility of a fine tuning of the sensing characteristics of the devices fabricated by simply controlling the amount of metal Oxide nanoparticles loaded onto the reduced graphene Oxide sheets. This was explained on the basis of the critical role played by the n-SnO2/p-RGO heterojunction formed on the composite materials.
Jing Ruan - One of the best experts on this subject based on the ideXlab platform.
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enhanced bioactivity and osteoinductivity of carboxymethyl chitosan nanohydroxyapatite graphene Oxide Nanocomposites
RSC Advances, 2018Co-Authors: Caiwen Xiao, Yazhuo Huang, Mingjiao Chen, Xiaoping Bi, Linna Lu, Xiaoxuan Yang, Huifang Zhou, Jing RuanAbstract:Tissue engineering approaches combine a bioscaffold with stem cells to provide biological substitutes that can repair bone defects and eventually improve tissue functions. The prospective bioscaffold should have good osteoinductivity. Surface chemical and roughness modifications are regarded as valuable strategies for developing bioscaffolds because of their positive effects on enhancing osteogenic differentiation. However, the synergistic combination of the two strategies is currently poorly studied. In this work, a nanoengineered scaffold with surface chemistry (oxygen-containing groups) and roughness (Rq = 74.1 nm) modifications was fabricated by doping nanohydroxyapatite (nHA), chemically crosslinked graphene Oxide (GO) and carboxymethyl chitosan (CMC). The biocompatibility and osteoinductivity of the nanoengineered CMC/nHA/GO scaffold was evaluated in vitro and in vivo, and the osteogenic differentiation mechanism of the nanoengineered scaffold was preliminarily investigated. Our data demonstrated that the enhanced osteoinductivity of CMC/nHA/GO may profit from the surface chemistry and roughness, which benefit the β1 integrin interactions with the extracellular matrix and activate the FAK–ERK signaling pathway to upregulate the expression of osteogenic special proteins. This study indicates that the nanocomposite scaffold with surface chemistry and roughness modifications could serve as a novel and promising bone substitute for tissue engineering.
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enhanced bioactivity and osteoinductivity of carboxymethyl chitosan nanohydroxyapatite graphene Oxide Nanocomposites
RSC Advances, 2018Co-Authors: Zhang Yu, Caiwen Xiao, Yazhuo Huang, Mingjiao Chen, Xiaoping Bi, Linna Lu, Xiaoxuan Yang, Huifang Zhou, Jing RuanAbstract:Tissue engineering approaches combine a bioscaffold with stem cells to provide biological substitutes that can repair bone defects and eventually improve tissue functions. The prospective bioscaffold should have good osteoinductivity. Surface chemical and roughness modifications are regarded as valuable strategies for developing bioscaffolds because of their positive effects on enhancing osteogenic differentiation. However, the synergistic combination of the two strategies is currently poorly studied. In this work, a nanoengineered scaffold with surface chemistry (oxygen-containing groups) and roughness (Rq = 74.1 nm) modifications was fabricated by doping nanohydroxyapatite (nHA), chemically crosslinked graphene Oxide (GO) and carboxymethyl chitosan (CMC). The biocompatibility and osteoinductivity of the nanoengineered CMC/nHA/GO scaffold was evaluated in vitro and in vivo, and the osteogenic differentiation mechanism of the nanoengineered scaffold was preliminarily investigated. Our data demonstrated that the enhanced osteoinductivity of CMC/nHA/GO may profit from the surface chemistry and roughness, which benefit the β1 integrin interactions with the extracellular matrix and activate the FAK–ERK signaling pathway to upregulate the expression of osteogenic special proteins. This study indicates that the nanocomposite scaffold with surface chemistry and roughness modifications could serve as a novel and promising bone substitute for tissue engineering.
Caiwen Xiao - One of the best experts on this subject based on the ideXlab platform.
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enhanced bioactivity and osteoinductivity of carboxymethyl chitosan nanohydroxyapatite graphene Oxide Nanocomposites
RSC Advances, 2018Co-Authors: Caiwen Xiao, Yazhuo Huang, Mingjiao Chen, Xiaoping Bi, Linna Lu, Xiaoxuan Yang, Huifang Zhou, Jing RuanAbstract:Tissue engineering approaches combine a bioscaffold with stem cells to provide biological substitutes that can repair bone defects and eventually improve tissue functions. The prospective bioscaffold should have good osteoinductivity. Surface chemical and roughness modifications are regarded as valuable strategies for developing bioscaffolds because of their positive effects on enhancing osteogenic differentiation. However, the synergistic combination of the two strategies is currently poorly studied. In this work, a nanoengineered scaffold with surface chemistry (oxygen-containing groups) and roughness (Rq = 74.1 nm) modifications was fabricated by doping nanohydroxyapatite (nHA), chemically crosslinked graphene Oxide (GO) and carboxymethyl chitosan (CMC). The biocompatibility and osteoinductivity of the nanoengineered CMC/nHA/GO scaffold was evaluated in vitro and in vivo, and the osteogenic differentiation mechanism of the nanoengineered scaffold was preliminarily investigated. Our data demonstrated that the enhanced osteoinductivity of CMC/nHA/GO may profit from the surface chemistry and roughness, which benefit the β1 integrin interactions with the extracellular matrix and activate the FAK–ERK signaling pathway to upregulate the expression of osteogenic special proteins. This study indicates that the nanocomposite scaffold with surface chemistry and roughness modifications could serve as a novel and promising bone substitute for tissue engineering.
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enhanced bioactivity and osteoinductivity of carboxymethyl chitosan nanohydroxyapatite graphene Oxide Nanocomposites
RSC Advances, 2018Co-Authors: Zhang Yu, Caiwen Xiao, Yazhuo Huang, Mingjiao Chen, Xiaoping Bi, Linna Lu, Xiaoxuan Yang, Huifang Zhou, Jing RuanAbstract:Tissue engineering approaches combine a bioscaffold with stem cells to provide biological substitutes that can repair bone defects and eventually improve tissue functions. The prospective bioscaffold should have good osteoinductivity. Surface chemical and roughness modifications are regarded as valuable strategies for developing bioscaffolds because of their positive effects on enhancing osteogenic differentiation. However, the synergistic combination of the two strategies is currently poorly studied. In this work, a nanoengineered scaffold with surface chemistry (oxygen-containing groups) and roughness (Rq = 74.1 nm) modifications was fabricated by doping nanohydroxyapatite (nHA), chemically crosslinked graphene Oxide (GO) and carboxymethyl chitosan (CMC). The biocompatibility and osteoinductivity of the nanoengineered CMC/nHA/GO scaffold was evaluated in vitro and in vivo, and the osteogenic differentiation mechanism of the nanoengineered scaffold was preliminarily investigated. Our data demonstrated that the enhanced osteoinductivity of CMC/nHA/GO may profit from the surface chemistry and roughness, which benefit the β1 integrin interactions with the extracellular matrix and activate the FAK–ERK signaling pathway to upregulate the expression of osteogenic special proteins. This study indicates that the nanocomposite scaffold with surface chemistry and roughness modifications could serve as a novel and promising bone substitute for tissue engineering.
Abel Rousset - One of the best experts on this subject based on the ideXlab platform.
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Aligned carbon nanotubes in ceramic-matrix Nanocomposites prepared by high-temperature extrusion
Chemical Physics Letters, 2002Co-Authors: Alain Peigney, Emmanuel Flahaut, Christophe Laurent, Françoise Chastel, Abel RoussetAbstract:Carbon nanotube (CNT)-metal-Oxide Nanocomposites are extruded at high temperatures. The superplastic forming is made easier by the CNTs. It is possible to align the CNTs in ceramic-matrix Nanocomposites, which are bulk materials rather than fibers or thin films. The CNTs withstand the extreme shear stresses occurring during the extrusion. In addition to electron microscopy revealing the alignment, the materials show an anisotropy of the electrical conductivity, which could be adjusted by controlling the amount of CNTs.
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Carbon nanotube-metal-Oxide Nanocomposites: Microstructure, electrical conductivity and mechanical properties
Acta Materialia, 2000Co-Authors: Emmanuel Flahaut, F. Chastel, Ch Laurent, Ch Marlière, Alain Peigney, Abel RoussetAbstract:Carbon nanotube-metal-Oxide composites (metal = Fe, Co or Fe/Co alloy; Oxide = Al2O3, MgO or MgAl2O4) have been prepared by hot-pressing the corresponding composite powders, in which the carbon nanotubes, mostly single or double-walled, are very homogeneously dispersed between the metal-Oxide grains. For the sake of comparison, ceramic and metal-Oxide Nanocomposites have also been prepared. The microstructure of the specimens has been studied and discussed in relation to the nature of the matrix, the electrical conductivity, the fracture strength and the fracture toughness. The carbon nanotube-metal-Oxide composites are electrical conductors owing to the percolation of the carbon nanotubes.
Marco Sangermano - One of the best experts on this subject based on the ideXlab platform.
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Inkjet printed acrylic formulations based on UV-reduced graphene Oxide Nanocomposites
Journal of Materials Science, 2013Co-Authors: R. Giardi, Samuele Porro, Edvige Celasco, Alessandro Chiolerio, Marco SangermanoAbstract:This work reports the formulation of water-based graphene Oxide/acrylic nanocomposite inks, and the structural and electrical characterization of test patterns obtained by inkjet direct printing through a commercial piezoelectric micro-fabrication device. Due to the presence of heavily oxygenated functional groups, graphene Oxide is strongly hydrophilic and can be readily dispersed in water. Through a process driven by UV irradiation, graphene Oxide contained in the inks was reduced to graphene during photo-curing of the polymeric matrix. Printed samples of the nanocomposite material showed a decrease of resistivity with respect to the polymeric matrix. The analysis of the influence of printed layer thickness on resistivity showed that thin layers were less resistive than thick layers. This was explained by the reduced UV penetration depth in thick layers due to shielding effect, resulting in a less effective photo-reduction of graphene Oxide.
