speed liquid chromatography, especially the gel permeation chromatography offers new possibilities for the characterisation of complex mixtures of hydrocarbons like pitch. This method makes possible a qualitative measurement of the molecular weight distribution of quinoline soluble pitch fractions,
163. Electronic properties of carbon fibres
β Scribed by T Tsuzuku; S Arai
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 125 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
β¦ Synopsis
scattering at the boundaries is one of the causes and possibly the dominant one for the observed negative magnetoresistance.
- Non-linear conduction in graphite at high electric field S. Mizushima (School of En~~e~~g, K&o ~n~ve~~, Tokyo, &pan). Saturation of current in graphite at high electric field was found, which is considered to be caused by the electron-phonon interaction, along with concomittant phenomena such as current oscillation and light emission, which are supposedly results of current pinch. 16% The effect of applied current on electrical conduction in hot-pressed pyrolytic graphite before and after neutron irradiation J. D. Cooper, M. L. Yeoman and D. A. Young (Department of ChemzCal Engineering and Chemical Technoes, Im~al CoUege, Loon, S.W. 7, U.K.
). The application of hydrostatic pressure to graphite produces a large pressure coefficient of conduction normal to the basal planes. In this direction the pressure coefficient is almost independent of temperature. Parallel to the basal planes, however, the pressure coefficient depends markedly on temperature.
π SIMILAR VOLUMES
The electronic properties of purified carbon nanotube (multicylinder structure with an outer diameter of z 20 nm and a length of z 10 pm) was first examined based on the electron spin resonance (ESR) spectroscopy. By the Raman scattering measurement, only one peak at 158 1 cm-1 similar to that of gr
A detailed study of the temperature and the duration of oxidation of polyacrylonitrile fibres has been made. The importance of choosing the correct duration and temperature of preoxidation has been demonstrated. Shrinkage during carbonization versus preoxidation time was studied. An empirical method
Microstructural features of carbon fibres based on both polyacrylonitrile (PAN) and mesophase pitch (MP) are discussed in relation to their compressional performance estimated by the recoil test. The compressive strength of carbon fibres is influenced by a combination of various structural features
Young's modulus and tensile strength of carbon fibres depend strongly on the preferred orientation of carbon layers in the fibres. The preferred orientation of these graphite layers can be increased by stretching the fibres during all stages of C-fibre production. acrylic fibers to carbon fibers. Ox