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It has been recently demonstrated that moiré pattern formed between graphene and supporting crystalline substrate can modulate atomic friction [1–3] which provides a novel strategy to control friction at the nanoscale. Despite the high potential of this new approach, its underlying mechanism is still unclear. Using molecular dynamics (MD) simulation, we reveal that moiré pattern induced lateral force...
A general and straightforward strategy was developed for fabricating transition metal carbide (TMC)/carbon (C) core/shell nanospheres (NSs) by laser ablation of transition metals in acetone/ethanol liquid. Various TMC/C core/shell NSs such as TaC/C, NbC/C, HfC/C, and MoC/C core/shell NSs were successfully fabricated, highlighting the generality of this method. Crucially, this approach is green, facile,...
Boron-catalyzed graphitization of carbon fibers was conducted in a boron-doped graphite crucible at 2000°C, in which boron diffused from the crucible to the carbon fibers to act as the catalyst. The microstructures, boron contents and mechanical properties of the resulting carbon fibers were characterized by Raman spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, high-resolution...
Polyimide(PI)-based carbon fibers with different properties were prepared by carbonization of PI fibers at 800°C, followed by heat treatment from 800 to 2800°C. The effect of heat treatment temperature (HTT) on elemental composition, surface morphology, mechanical properties, and the thermal and electrical conductivities of PI-based carbon fibers were investigated by elemental analysis, SEM, HRTEM,...
We developed a new approach to obtain onion-like carbon-encapsulated cobalt carbide (Co 3 C) core/shell nanoparticles (NPs) by the laser ablation of cobalt in acetone. The as-synthesized core/shell NPs were then characterized by transmission electron microscopy (TEM), X-ray diffraction, Raman spectroscopy, superconducting quantum interference device magnetometer and fluorescence spectrophotometer...
Nonequilibrium molecular dynamics is applied to investigate thermal transport across two CNTs connected longitudinally by molecular linkers, which is a basic building-block for CNT network structures. We show the effect of different numbers, monomer types, and lengths of molecular linkers on the interfacial thermal conductance between CNTs and molecular linkers. We also analyze the density of vibrational...
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