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To synthesize vertically aligned carbon nanotube (VA-CNT) arrays longer than a millimeter using chemical vapor deposition (CVD), aluminum oxide buffer has to be deposited on supporting substrates to prevent diffusion and aggregation of catalyst nanoparticles. Currently, reliable deposition has to be made using expensive and time-consuming e-beam evaporation or thermal sputtering. Here, we report a...
The effect of vapor-grown carbon fiber (VGCF) content on the mechanical properties and abrasion resistance of a VGCF/polytetrafluoroethylene (PTFE) composite was investigated. A resin powder of PTFE of 50μm in diameter was used as the matrix. The resin and VGCF were mixed by a blender mill with the VGCF content in the range 0–3wt%. Tensile testing was performed on an Instron type tensile testing machine...
Nanocasting was used to develop epoxy/graphene composites (EGCs) as corrosion inhibitors with hydrophobic surfaces (HEGC). The contact angle of water droplets on a sample surface can be increased from ∼82° (epoxy surface) to ∼127° (hydrophobic epoxy and EGC). It should be noted that EGC coating was found to provide an excellent corrosion protection effect on cold-rolled steel (CRS) electrode. Enhancement...
By ab initio calculation, Au, Cu, Fe, Ni, and Pt adatoms were proposed for modulating the electronic property of graphdiyne naoribbons (GDNRs). GDNRs of 1–4nm in width were found to be stable at room temperature, and the thermal rates of Au, Cu, Fe, Ni, and Pt adatoms escaping from GDNR are slower than 0.003atoms per hour even at 900K. According to the calculation, Au and Cu-decorated GDNRs are metallic...
Mo-doped carbon aerogels were obtained in the polycondensation reaction of aqueous resorcinol and formaldehyde by adding Mo-salt at two different stages of the synthesis: (i) to the initial sol; (ii) by incipient wetting impregnation of the supercritically dried polymer gel. Molybdenum added during the polymerization yielded a more compact gel structure with practically no mesoporosity. With post-impregnation,...
A highly efficient method has been reported to fabricate the reduced graphene oxide/MnO2 (RGO/MnO2) hybrid materials, a kind of catalysts for oxidative decomposition of methylene blue (MB). The pristine suspension of graphene oxide/manganese sulfate (GO/MnSO4) produced by the modified Hummers method is in situ transformed into GO/MnO2 composites in combination with KMnO4, and then further into RGO/MnO...
Phosphate functionalized carbon nanodots (C-dots) with satisfactory quantum yield have been prepared through one-step acidic oxidation of sucrose by H3PO4 at low temperature (60°C). The as-prepared C-dots are monodisperse with narrow size distribution. Besides, two C-dots emitting different colors, namely green and yellow, can be easily separated by collecting the supernatant and precipitate after...
Reduced GO in confined space of silica gel nanopores doped with sulfur shows high catalytic activity for oxygen reduction reaction (ORR) in alkaline medium and exhibits a superior tolerance to the presence of methanol. Even though the partially reduced GO with hydroquinone structures is a good catalysts for ORR, it shows instability in KOH. The good performance of S-doped material is linked to the...
We report a novel method to reduce layer number and structural defects of few-layer graphene (FLG) in He/H2 arc discharge via rapid cooling treatment. By adjusting the parameters of He/H2 mixtures appropriately, the effects of incremental cooling rates on the formation, morphology and structural defects of the raw soot have been investigated. According to observations of transmission electron microscopy...
Graphitic carbon nitride (g-C3N4) and its derivatives are promising candidates as catalysts or supports for photocatalytic applications. Since they are typically produced by polymerization or condensation of monomers under high temperature and high pressure, development of a cost-effective, solution-based, low-temperature method of production is important. Herein, novel hybrid materials composed of...
A series of reduced graphene oxide (RGO) colloids with different amounts of surface charges was prepared. The change in surface charge at different pH values was detected by zeta potential measurement, and the evolution of oxygen-containing functional groups attached to the RGOs was analysed by Fourier-transform infrared spectroscopy and ultraviolet-visible absorption spectroscopy. Results showed...
S-doped microporous carbon materials were synthesized by the chemical activation of a reduced-graphene-oxide/poly-thiophene material. The material displayed a large CO2 adsorption capacity of 4.5mmolg−1 at 298K and 1atm, as well as an impressive CO2 adsorption selectivity over N2, CH4 and H2. The material was shown to exhibit a stable recycling adsorption capacity of 4.0mmolg−1. The synthesized material...
For the first time, carbon nanotube (CNT) forests are fully characterized as transversely isotropic continuum material. Each of the five independent elastic constants is experimentally obtained using a combination of nanoindenter-based uniaxial compression and shear testing, in situ SEM compression, and digital image correlation (DIC) of vertically and laterally oriented CNT microstructure columns...
Arc discharge single-walled carbon nanotubes (SWCNTs) were modified through different oxidative treatments and functionalization reactions. The modified SWCNT powders were dispersed in four different aqueous media and purified by ultracentrifugation. Extinction coefficients of the modified SWCNTs depended on the SWCNT type but did not depend on the dispersion medium. According to visible/near infrared...
Structural health monitoring (SHM) seeks to provide ongoing monitoring of a structure’s integrity. Current SHM approaches include embedding some type of sensor within the composite or applying a sensor to the outside surface of the structure. These sensors react to strain or other changes in order to detect damage. In this study, a novel, multi-modal, nanomaterial based sensor technology that can...
A commercial polyimide, Matrimid® 5218, was pyrolyzed under an inert argon atmosphere to produce carbon molecular sieve (CMS) dense film membranes for nitrogen/methane separation. The resulting CMS dense film separation performance was evaluated using both pure and mixed N2/CH4 permeation tests. The effects of final pyrolysis temperature on N2/CH4 separation are reported. The separation performance...
Our objective is to understand how graphite can be formed at “low” temperatures (<1200°C) in contrast to the high temperature of the industrial processes (∼3000°C), and from precursors which are non-graphitizable by a thermal treatment alone. Blends of iron and saccharose char were heated between 650 and 1600°C. The carbons obtained were characterized by SEM, TEM and Raman microspectrometry. Our...
We demonstrate the thickness-, morphology-, and defect-tunable growth and simultaneous integration of aligned carbon nanotube (CNT) arrays using a novel microscale platform. This platform consists of a micromechanical spring of desired stiffness, which applies a precise vertical load to a vertically aligned CNT array during its growth by chemical vapor deposition (CVD). The micromechanical spring...
In order to produce the black color for electrophoretic display (EPD) applications in dual-particle systems, a primary-like sized carbon black (PCB) surface modification method is developed and the electrophoretic properties of the resulting functionalized particles are reported. The PCB surface was chemically modified by hydroxylation and subsequent esterification. The final capping material of the...
The friction and wear behaviour of MWCNT-reinforced Ni matrix bulk composites is investigated and compared to the response of a pure bulk reference sample. Several effects are observed in the composites such as microstructural refinement, leading to improved hardness, coefficient of friction and wear resistance. Said refinement might also be responsible for a non-trivial behaviour of hot-pressed composites...
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