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The atomic-scale steps are ubiquitous on graphene. The frictional behavior of graphene at atomic-scale steps under different relative humidity (RH) is very important for application of graphene as solid lubricant in complicated environment. Frictional properties at atomic-scale graphene steps were investigated using calibrated atomic force microscopy (AFM) in various RH. Lateral force at uncovered...
Graphene is one of the key building blocks for a broad range of flexible/stretchable electronics and has great potential as a solid lubricant in flexible micro/nanoelectromechanical systems, soft robot and microfluidic devices due to their excellent electrical, mechanical and tribological properties. The nanotribological properties of graphene on soft elastic substrate were studied using the calibrated...
In this study, the tribological behavior of in-situ exfoliated graphene for water-based lubricants is investigated. The aqueous graphene dispersions show high stability due to the assistance of a non-ionic surfactant, Triton X-100. The steel–steel ball-plate tribotest results reveal that the in-situ exfoliated graphene possesses brilliant frictional and anti-wear properties. Compared with pure deionized...
Up to now, the cost-effective mass production of pristine graphene sheets remains a significant challenge. We report a binary solvent system of dimethylformamide and n-butylalcohol that facilitates the high concentration production of unoxidized graphene through liquid-exfoliation assisted with sonication. A stable dispersion with concentration as high as 6.5mg/ml, was received via this method. The...
An acrylic emulsion artists’ paint containing chlorinated copper phthalocyanine pigment was modified with variable-size multilayer graphene (exfoliated graphite) to induce low electrical resistance; composite films were spray-cast on common printing paper, heat-cured, and subsequently polished under mild compression, to produce highly conductive paper. The mechanically robust conductive paint showed...
Electromagnetic interference (EMI) shielding reduces coupling between signals, crosstalk among electrical components, noise in cables and communication systems, etc. With the increasing speed of terahertz (THz) electronic circuits and systems, THz EMI shielding is becoming increasingly more important. We review recent and pioneering studies on shielding property–structure characterization and applications...
Nano graphene oxide (NGO) was produced by further refluxing graphene oxide (GO) sheets in HNO 3 , and carboxylic acid functionalized graphene oxide (GO–COOH) was obtained by a simple etherification reaction between GO and chloroacetic acid. The GO, GO–COOH and NGO sheets are combined with TiO 2 nanorods by a two-phase assembling method, and confirmed by transmission electronic microscopy...
To improve the anti-oxidation and ablation properties of carbon/carbon (C/C) composites, they are modified by hafnium boride (HfB 2 ) using a two-step process of in situ reaction and thermal gradient chemical vapor infiltration. X-ray diffraction is used to monitor the composition of the samples. Scanning electron microscope images show that the carbon fibers are uniformly coated by HfB ...
We report studies on the controlled step-by-step oxidative functionalization of monolayer graphene by chemically reactive water-vapor plasma dry etching. The use of a porous mask on top of the graphene sheets as a filter is essential to reduce the density of free radicals and weaken the sputtering effect. Micro-Raman spectroscopy, X-ray photoelectron spectroscopy and atomic force microscopy showed...
Ultra-large mesoporous carbon materials were synthesized with the use of triblock copolymers and phloroglucinol/formaldehyde polymer as filler under acid conditions. The carbons obtained by employing F127 as template and carbonizing at 600°C exhibit large mesopores with a narrow pore-size distribution centered at 19.2nm. With the assistance of decane as a swelling agent, the pore size of the P123-templated...
Low-temperature autoclaving has been demonstrated to synthesize monolithic carbon materials with an ordered mesostructure by using triblock copolymer F127 as template, and resorcinol/formaldehyde resol as carbon precursor under acidic conditions. Transmission electron microscopy, small angle X-ray scattering, Fourier transform infrared spectroscopy and nitrogen adsorption measurements show that the...
Studies of acetone-based suspensions suggest a synergistic stabilization of clay by carbon black (CB) that involves a haloing effect (i.e., CB surrounding clay). This unique microstructural development ultimately influences the electrical and mechanical properties of epoxy composites that contain both particles. With the addition of 0.5 wt.% clay, electrical conductivity increases by an order of magnitude...
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