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Nanoindentation tests on a carbon fiber and carbon matrix composite (C/C composite) for nuclear applications were carried out over a load range from 50 μN to 20 mN on two different cross-sections, normal and parallel to the fiber axis. For reference, an isotropic nuclear graphite was also examined. Both the composite and graphite revealed a large amount of elastic recovery on the first loading-unloading...
Structural analysis of the polyacenic semiconductor (PAS) material prepared by the pyrolysis of phenol-formaldehyde resin at relatively low temperature (680°C) has been performed by applying 129 Xe nuclear magnetic resonance (NMR) measurements. One can obtain information on the microporous structure of the PAS material through adsorption of Xe atoms, since a 129 ...
The alkali-doped polyacenic semiconductor (PAS) materials have been prepared by thermal decomposition of alkali azides (AN 3 , where A = Li, Na, K and Rb) in vacuo, and their electronic properties have been studied based on the electron spin resonance (ESR) spectral measurements as functions of atomic number (Z) of the dopant metal and of temperature (T) in the range 2-300 K. From the ESR...
To aid the analysis of interlayer interactions in double-layer carbon nanotubes, the interactions between two graphene sheets have been analytically examined within the framework of the Huckel approximation. Although there is a limitation to apply the present results to the actual double-layer nanotubes, it has been suggested that a certain interlayer interaction mode affects the metallic state of...
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