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This study fabricates a transparent cyclic olefin copolymer (COC)/thermally reduced graphene oxide (TRGO) composite film with low content of TRGO, which exhibits high water vapor barrier properties. With only 0.06wt% (0.028vol%) TRGO, the COC/TRGO composite film reduces the water vapor permeability by ∼21%. The amount of TRGO in this work is 10–100 times lower than that in other polymer/clay or polymer/graphene...
Bismaleimide reinforced with both MWCNTs and carbon fibers was prepared by mold-pressing carbon fiber paper stacks impregnated with a bismaleimide acetone solution containing MWCNTs grafted with ethylene diamine. The MWCNTs were oxidized by concentrated HNO 3 to form carboxyl groups before grafting. Results show that the flexural modulus, flexural strength and impact strength of composite...
A nano-porous carbon was prepared by carbonization of a novel synthetic resorcinol–formaldehyde (RF) polymer without any additional activation process, and used as electrode materials for aqueous electric double-layer capacitors (EDLCs). This novel RF polymer-based carbon shows high specific surface area with large carbonization yield (∼50%), and excellent specific dc capacitance over 200F/g. The...
A soft chemical method was used to insert silica bridging species between the layers of a graphite oxide precursor to form nanoporous graphitic composites (NPGC) and the effect of various synthetic conditions including colloidal dispersion, interlayer pre-expansion, and hydrolysis of silica source on the pore formation of NPGC was examined. It was found that an optimal alkali concentration for GO...
Multi-walled carbon nanotubes after modified by using a H 2 SO 4 and HNO 3 mixture solution were added to cement matrix composites. The mechanical properties of the newly formulated composites were analyzed, and the results show that the treated nanotubes can improve the flexural strength, compressive strength, and failure strain of cement matrix composites. The porosity and...
This paper reported the adsorption of cationic–anionic surfactant mixtures, such as octyltriethylammonium bromide/sodium dodecylbenzenesulfonate (OTEAB/SDBS) and dodecylpyridinium chloride/sodium octanesulfonate (DPC/SOS), on activated carbon (AC) in deionized water and in mineralized water systems. The AC surface chemistry was characterized by X-ray photoelectron spectroscopy and ζ-potential determinations...
Catalytic graphitization of carbon laminations was carried out using mesocarbon microbeads as the matrix precursor. Aqueous tape casting was used to prepare the carbon laminations, which were doped separately with Ti, ZrO 2 and B 4 C powders. After sintering at 1400 o C in a vacuum, these dopants were found to enhance the degree of graphitization and improve the properties...
Structural and surface property changes of macadamia nut-shell (MNS) char upon activation and high temperature treatment (HTT) were studied by high-resolution nitrogen adsorption, diffuse reflectance infra-red Fourier transform spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption. It is found that activation of MNS char can be divided into the low extent activation...
SiC coatings prepared by chemical vapor deposition and from polycarbosilane (PCS) solution; also, SiO 2 and Al 2 O 3 coatings by Sol-Gel method were investigated in detail, to improve the oxidation resistance of carbon fibers as important reinforcement in advanced composites. A β-SiC coating was obtained on carbon fibers by pyrolysis of CH 3 SiCl 3 and H ...
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