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Trace amounts of edge sites in natural graphite, synthetic graphite and high-temperature treated coke are quantitatively analyzed from the numbers of hydrogen atoms and oxygen-containing functional groups at carbon edge sites. For the analysis of hydrogen content, a new analytical technique is developed. The oxygen-containing functional groups are analyzed with a highly sensitive temperature-programmed...
Commercially available pure cellulose paste of plant origin composed of nanofibrils was dispersed in ethanol or distilled water, and sheets made of the nanofibrils were prepared by filtration. The sheets were carbonized and then heat-treated at temperatures between 2400 and 3200°C at atmospheric pressure, and the original paste was also carbonized and heat-treated at 3100°C. The diameter of the cellulose...
Commercially available phenol-based carbon nanofibers (CNFs) and activated carbon nanofibers (ACNFs) about 200–500nm in diameter were heated to 900°C and then heat-treated further at temperatures of 3000–3200°C. The texture and structure of the both heat-treated samples were investigated by SEM and TEM observations and measurements of XRD and Raman spectra. A large number of fine graphite particles...
Bacteria cellulose was prepared from nata de coco which is composed of pure cellulose nanofibers. The nanofibers were dispersed in ethanol or distilled water and were stirred and then filtered to obtain paper-like sheets. The diameters of the nanofibers were in the range of 30 to 60nm. The sheets were carbonized and then heat-treated at temperatures between 2400 and 3200°C in a high purity Ar flow...
The electrical and thermal conductivities in the basal plane of graphite films prepared from aromatic polyimide films were evaluated with reference to previously measured electrical and thermal conductivities along their longitudinal directions at room temperature with the aid of magnetoresistance anisotropy measurement at 77k. The average crystal-grain size of each graphite film was obtained from...
Porous aromatic polyimide films of 28 and 59μm thickness and with about 50% porosity (PAPIF-28 and -59) were carbonized and then heat-treated to various temperatures up to 3000°C, and their texture and graphitizability were investigated. A porous texture on the micrometric scale remained on the surfaces and inside the heat-treated PAPIF-28 and -59 films but the 3000°C-treated PAPIF-28 film was not...
Highly crystallized graphite films were prepared from carbonized films derived from commercially available aromatic polyimide films by simple heat treatment at temperatures exceeding 3000°C. Thermal conductivity κ along the longitudinal direction of each graphite film was measured at room temperature in air by a steady-state method. Measurements of the electrical conductivity σ along the longitudinal...
Bacteria cellulose is composed of pure cellulose nanofibrils with about 30–60nm width. The original conglomerate of bacteria cellulose was dispersed in ethanol or distilled water and filtered, and paper like sheets were prepared. The conglomerate itself and the sheets were carbonized and then heat-treated at 3100°C. The development of graphite structure by the heat treatment was observed for these...
Multiwalled carbon nanotubes were used as filler to furan resin in the aim of producing an electrically conducting polymer composite that may be useful for electrode applications. The orientation of the nanotubes is controlled to prepare a composite with fillers unidirectionally oriented, which may result in higher electrical conductivity at one direction and at lower nanotube loading. Using the doctor...
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