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We present a comparative study of magetoresistance (MR) behaviors in few-layer graphene (FLG) and multilayer graphene (MLG) with various thicknesses. A maximum MR as large as 9500% is observed in a ∼23 nm sample @ 2.5 K, with a non-saturating linear characteristic up to 7 T. MR decreases with increasing temperature and is proportional to the average mobility <μ> in ∼23 nm and ∼12 nm thick...
The fracture properties of two nuclear-grade graphites, the Japanese IG11 graphite and Chinese NG-CT-01 graphite, were evaluated under flexural conditions. Three-point bend tests were performed on centre-notched beams to determine the tension softening curve (TSC), Mode-I fracture toughness K IC and the fracture energy G F . The TSC of the nuclear graphites was originally determined...
Bovine cortical bone was pyrolyzed to produce a network of conductive carbon entwined with native hydroxyapatite that maintains its macroscopic structure during pyrolysis and prevents collapse of the carbon. Self-supporting conductive carbon monoliths were prepared by removing the hydroxyapatite with acid or ethylenediaminetetraacetic acid. The specific surface areas of these monoliths were determined...
Flake graphite has been found to transform into spherical graphite in liquid nickel. Graphite spheres with diameters ranging from 300 to 1μm have been extracted by acid erosion of the nickel, and have been characterized using various techniques. The surface of graphite spheres shows disordered atomic stacking and defects. This is in agreement with the Raman spectrum result which shows that the structure...
Torsional strain energy evolution of a single-walled carbon nanotube (CNT) and torsional stability of a CNT encapsulating a helical copper nanowire are investigated by molecular dynamics simulations. The strain energy transfer of the pristine CNT reveals a unique wave-like mode along the torsional axis and afterwards isoenergetic strips form helical distributions in the vicinity of the critical point...
Molecular dynamics combined with continuum mechanics is utilized to predict the compressive mechanical properties of carbon nanotubes encapsulating helical copper nanowire (NW@CNTs). The helical structures of the copper nanowires are obtained using the “simulated annealing” method. The compressive behaviors of this kind of composites are studied. The strain energy curves are shown to predict the interaction...
Molecular dynamics simulation is used to study the transport behavior of water molecules along an open-ended single-walled carbon nanotube (SWCNT) under the driving force of methane molecules. The methane molecules pull the water molecules from the inside of a SWCNT along the axial direction. The transport velocity of water molecules increases with increasing number of methane molecules, but decreases...
A new type of carbon nanotubes prepared by catalytic decomposition of CH 4 (CH 4 -CNT) was studied and compared with carbon nanotubes derived from CO-disproportionation (CO-CNT) and graphite. HRTEM observation reveals that the structural graphene sheets are in a conical hollow shape for CH 4 -CNT but in a cylindrical shape for CO-CNT. The valence band structure of CH 4...
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