SAXS Characterization of Nanochannels in Polymer-Derived SiC Fibers
In the preparation of polymer-derived SiC fibers, nanochannels are believed to be formed in the early pyrolysis stages due to loss of large volumes of pyrolysis gases. In this paper, small angle X-ray scattering (SAXS) was applied to the characterization and calculation of nanochannels in partiallypyrolyzed SiC fibers. The SAXS measurements showed that nanochannels with a radius of 1.0-20 nm were formed for fibers heat-treated at 973K and 1173K. But their distributions were not continuous and at lower part of the distribution, a peak value was observed at about 1.2nm. This means if the nanochannels are finely controlled, the partially-pyrolyzed SiC fibers have great potential application in the fields of hydrogen storage, gas separation, and so on.
Wei Pan and Jianghong Gong
Z. Y. Chu, R. A. He, X. D. Li, H. F. Cheng, J. Wang, "SAXS Characterization of Nanochannels in Polymer-Derived SiC Fibers", Key Engineering Materials, Vols. 336-338, pp. 1301-1303, 2007