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Pt nanoparticles dispersed nitrogen-doped magnetic carbon nanoparticles (N-MCNPs) were prepared by chemical method, conventional sodium borohydride reduction. Then, those probable applications were evaluated for a support material comparing with Vulcan XC-72 for polymer electrolyte membrane fuel cell. N-MCNPs-supported Pt nanoparticles show a better activity of methanol oxidation reaction compared...
Using thermogravimetry (TG) under conditions that minimize inhibition by the hydrogen produced, the intrinsic catalytic rates of skeletal Ni, pure and alloyed with solute metals Fe, Co, or Cu, were evaluated in methane decomposition to carbon nanofibers. In “standard” tests, i.e., after pre-reduction in H 2 and exposure to CH 4 directly at 450°C, several catalysts reached stable activities...
An ordered mesoporous carbon with a high surface area of 2390m 2 /g and a large pore size of 6.7nm was synthesized through an organic–inorganic-surfactant tri-constituent co-assembly method which used resols as the carbon precursor, silicate oligomers as the inorganic precursor and triblock copolymer as the soft template. The electrochemical properties of this carbon were evaluated as an electrode...
A simple strategy for preparing potential drug delivery systems is presented which appears to be a good alternative to stealth liposomes in terms of stability in buffered aqueous solutions. Microcapsules have been prepared by deposition of shortened and polyethylene glycol-derivatized nanotubes onto positively charged multilamellar vesicles using the layer-by-layer technique. The stability of microcapsules...
A gradient self-healing coating consisting of three layers, SiC–B 4 C/SiC/SiO 2 , was examined as a multilayer protection for carbon/carbon composites. The inner layer was made of B 4 C and β-SiC, the middle layer was a SiC based layer, and the outer layer was SiO 2 as an airproof layer. Both inner and middle layers were produced to be diphase structure by a pack cementation...
The unique physical and chemical properties of carbon nanotubes (CNTs) suggest enormous potential for many areas of research and application. The urgent need for toxicological studies on CNTs has arisen from the steadily increasing production volume. 2-(4,5-dimethyl-2-thiazolyl)-3,5-diphenyl-2H-tetrazolium bromide (MTT) assay is among the most versatile and popular assays used for in vitro toxicology...
Metal oxide films, including Ce 2 O 3 and/or CeO 2 , Al 2 O 3 , La 2 O 3 , were deposited on the outer surfaces of carbon nanotubes (CNTs) through the decomposition of metal nitrate precursors in supercritical CO 2 modified with ethanol. Transmission electron microscopy showed that CNTs could be coated with metal oxide layers that were...
To change the structures and yields of carbon nano-products, transverse magnetic field (TMF) was introduced to arc discharge in liquid (de-ionized water, liquid nitrogen). Direct current was used to sustain the arc discharge between two graphite electrodes and cobalt powder was filled in drilled anodes as catalyst sometimes. Scanning electron microscopy and high-resolution transmission electron microscopy...
Formation of palladium fullerides from various Pd:C 60 compositions was studied by XRD, Raman spectroscopy and TEM. Raman spectra of Pd x C 60 samples show close similarity to spectra of C 60 polymers obtained under high pressure/high temperature conditions and suggest the formation of chain-like and two-dimensional polymeric structures in Pd x C 60 ...
Multiwalled carbon nanotubes were irradiated using 2MeV Ag 2+ ions with fluences 1×10 15 and 1×10 16 ions/cm 2 . The samples were characterized by transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The graphene structure of the nanotube wall is found to be damaged upon irradiation. Although at a fluence of 1×10 15 ions/cm...
The carbon nanotube bulk material was prepared by the spark plasma sintering of multi-walled carbon nanotubes. When the surface of the bulk material was polished unexpected graphitization happened and the surface became covered by interlocked graphene layers. A similar phenomenon was observed in polishing raw multi-walled carbon nanotubes, indicating that a sheer stress caused graphene layers to peel...
To prepare a carbon nanotube (CNT)/carbon fiber multi-scale reinforcement (MSR), multi-walled carbon nanotubes (MWCNTs) functionalized at the end caps with hexamethylene diamine (HMD) are grafted onto the surfaces of carbon fibers treated with acyl chloride. The surface element concentrations, surface functional groups and morphology of the MSR were examined by X-ray photoelectron spectroscopy (XPS)...
A thermodynamical model of hydrogen storage in slitpores is presented and applied to carbon and BN nanoporous materials. The model accounts for the quantum effects of the molecules in the confining potential of the slitpores. A feature of the model is a new equation of state (EOS) of hydrogen, valid over a range of pressures wider than any other known EOS, obtained using experimental data in the range...
The synthesis of oxidised water-soluble fullerenes, prepared by chemically-induced aerobic oxidation, yields functionalised carbon cluster structures, which are oxidised by the covalent insertion of different oxygen units. Their strictly pH-dependent behaviour in aqueous solutions appears to be properly ascribed to the existence of directly attached carboxylic moieties. The presence of these groups,...
The effects of hydrogen produced upon KOH activation of an anthracite precursor were investigated by temperature programmed reaction (TPR) and post-carbonization temperature programmed desorption (TPD). TPR experiments performed with and without added hydrogen in the sweep gas for different KOH/anthracite ratios demonstrate that the greater this ratio, the greater the amount of hydrogen evolved during...
Graphite foam was obtained after carbonization and graphitization of a pitch foam formed by the pyrolysis of coal tar based mesophase pitch mixed with graphite particles in a high pressure and temperature chamber. The graphite foam possessed high mechanical strength and exceptional thermal conductivity after adding the graphite particles. Experimental results showed that the thermal conductivity of...
This paper describes the electrochemical performance of carbon onions, nanodiamonds, carbon black and multiwalled nanotubes as electrodes in electrical double layer capacitors with organic electrolyte. Onions were formed by vacuum annealing of 5nm nanodiamond (ND) powder at 1200–2000°C with the goal to investigate the effect of carbon microstructure on specific capacitance and ion transport. In contrast...
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