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We report a scalable and volatile organic compound-free process for the production of well-dispersed carbon nanotubes (CNTs) in a polymer by the rapid expansion of a supercritical suspension (RESS), in which CNTs had been suspended in supercritical carbon dioxide, and CO2 and CNTs released from the suspension were rapidly vented through a nozzle. Reagglomeration of the CNTs after RESS can be prevented...
We present a detailed assessment of centrifugation technique for purification of single wall carbon nanotubes (SWCNTs) for application as transparent conductive electrodes. As-grown and highly-purified SWCNTs were dispersed in surfactants by ultrasonication, and then centrifuged to selectively remove carbonaceous and metal impurities. The centrifuged supernatant suspensions were made into thin films...
A novel fabrication method for carbon composites using liquid phase activated sintering at 1400°C in vacuum is described. Specimens for testing were prepared by subjecting mixtures of mesocarbon microbeads (MCMBs), Ti/Ni or Fe/Ni powders, and suitable additives, to aqueous tape casting, and molding the tapes into laminates prior to sintering. After sintering XRD showed that there were some eutectic...
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...
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