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Carbon nanotubes filled with continuous crystalline nanowires of nanometre-scale diameter and micrometre-scale length of the ferromagnetic phase α-Fe were produced with a new chemical vapour deposition method. We report a new two-stage approach, a perturbed-vapour method of synthesis followed by a post-synthesis heat treatment that produces multiwall carbon nanotubes filled with at least 19 micrometre-length...
We report a microwave-assisted synthesis of a self-assembled three-dimensional graphene-carbon nanotube-nickel (3D G-CNT-Ni) nanostructure, which can be used as a high capacity anode material in lithium-ion batteries (LIBs). The unique 3D G-CNT-Ni nanostructure shows that CNTs are grown on graphene sheets through tip growth mechanism by Ni nano-particles. Bunches of CNTs and graphene sheets produce...
A polyethylene terephthalate (PET) fabric was pretreated by alkaline-hydrolyzation. Both the pristine and pretreated PETs were loaded with nano carbon blacks (CB1515 and CB156), mixtures of nano TiO 2 (NTO) and NCBs (CB1515 or CB156) using an impregnation method with sodium dodecyl sulfate as a dispersing agent. Citric acid (CA) and sodium hypophosphite (SHP) were also used as a cross-linking...
Activation effects on carbon films, derived from commercial aromatic polyimide films (Kapton, DuPont), in CO 2 atmosphere at 1203K on capacitance properties were studied. Two thicknesses of polyimide films were used: 7 and 25μm. Pore formation during the activation process progresses in two steps due to the existence of a denser surface layer and a more porous core material. In the first step...
Monolithic nitrogen-doped porous carbon was synthesized by the copolymerization of resorcinol and formaldehyde in the presence of l-lysine as the catalyst at the ambient conditions. The carbon is designated RFL. In order to increase the active nitrogen content, nitrogen-rich melamine was added, and the resulting material (RFLM) has more nitrogen-containing functional groups, and a higher specific...
We developed a direct carbonization strategy to efficiently fabricate mesoporous N-containing carbon nanosheets (N-CNSs) by using polyaniline nanosheets as a carbon precursor. Physicochemical characterizations revealed that the as-synthesized N-CNSs with 5.9wt.% N species possessed a well-developed mesoporous architecture with large specific surface area of 352m 2 g −1 , high mesoporous...
Adsorption in porous materials is a promising technology for CO 2 capture and storage. Particularly important applications are adsorption separation of streams associated with the coal power plant operation, as well as natural gas sweetening. High surface area activated carbons are a promising family of materials for these applications, especially in the high pressure regimes. As the streams...
Perturbations of the two dimensional carbon lattice of graphene, such as grain boundaries, have significant influence on the charge transport and mechanical properties of this material. Scanning tunneling microscopy measurements presented here show that localized states near the Dirac point dominate the local density of states of grain boundaries in graphene grown by chemical vapor deposition. Such...
The newly-designed vertical array structure of carbon nanotubes (CNTs) surrounding carbon nanopipes (CNTs@CNPs) was fabricated, which includes the formation of the primary CNP (ca. 200nm in diameter) arrays in virtue of the anodic aluminum oxide (AAO) membrane template with infiltration of polymer solution containing metal catalyst precursor, followed by carbonization and CVD growth of the secondary...
Pristine graphite, multi-walled carbon nanotubes (MWCNTs), singe-walled carbon nanotubes (SWCNTs), and functionalized SWCNTs with large numbers of oxygen-containing groups (FSWCNTs) have been used as electrocatalysts for the Br-/Br3- redox couple reactions in the positive half-cell of the vanadium bromide redox battery. The structure, composition, and electrochemical properties were characterized...
Ultrathin graphitic nanostructures are grown inside solid activated carbon particles by catalytic graphitization method with the aid of Ni. The graphitic nanostructures consist of 3–8 graphitic layers, forming a highly conductive network on the surface of disordered carbon frameworks. Owing to the ultrathin characteristic of the produced graphitic nanostructures, the resulted porous graphitic carbons...
Graphene-based nanomaterials are expected to have a profound impact on a broad range of applications. However, studies devoted to investigating the putative adverse health effects of these nanomaterials are hugely underrepresented in the current scientific literature. We have investigated the in vitro short-term cellular toxicity associated with graphene derivatives (GD): graphene oxide and reduced...
We report on ab initio study of the electronic states and transport characteristics for armchair graphene nanoribbon devices with point defects. Geometric optimization of the point defect channel revealed the self-organizing property of the graphene. Density of state (DOS) calculation shows the point defect-induced gap states. However, the quantum transport calculations revealed that these defect-induced...
4D preforms woven with carbon fiber bundles and carbon rods were densified by repeated pitch impregnation, carbonization and high temperature treatment to obtain 4D-C/C composites. The tensile properties were investigated at room temperature when tension was applied in the carbon rod direction (Z direction). The strain and stress under tensile load were measured, and the surface morphologies of specimens...
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