Carbon whisker, electron diffraction

Figure IS. Size and distortion separation. Integral breadth iss against l2 for the 001 reflections of carbon fiber and graphite whisker. Electron diffraction traces with 001 reflections resolved from hkO reflections.

Experimental results. Some carbon fibre specimens reveal several orders of 001 particularly in electron diffraction patterns Figure 15 shows a plot of (3 against l2, equation (3), for an electron diffraction pattern from the skin region of a high-modulus material. L(oOl)> usually referred to as Lc, is 3.5 nm and a = 2%. A full description of electron-diffraction analysis in several similarly heterogeneous carbon fibres has been published (23). Figure 15 also includes a plot from the 001 electron diffraction profiles of a carbon whisker, an exceptionally perfect graphite material. This specimen, with an Lc of 10 nm, has zero distortion, and represents the only case where we have found no distortion in a fibrous specimen. 

The infrared spectrum of calcium carbonate whiskers is shown in Figure 5.1 thermal analysis is shown in Figure 5.2 x-ray diffraction is shown in Figure 5.3 a scanning electron... 

Besides the expected glassy carbon structure, the resulting product often contained considerable amounts of needle-like material that was determined to have a three-dimensional graphitic structure. The graphitic whiskers resulting from the experiments were usually a few microns long and about 1 (tm thick. Electron diffraction and transmission electron microscopy (TEM) revealed the twinned structure of the whiskers. The angle between the layers was measured to be about 135°. 

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