Microstructural study of carbonized wood after cell wall sectioning
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Wooden blocks of Japanese cedar (Cryptomeria japonica) were carbonized at 700 and 1,800 °C. The microstructure was analyzed by transmission electron microscopy (TEM) and μ-Raman spectroscopy of the inner planes of wood cell walls. The predominant structure was of a turbostratic nature and no heterogeneity was observed originating from the original cell walls. TEM observations of samples carbonized at 1,800 °C showed ordered regions in the surface layer of cell walls. This result was supported by polarized μ-Raman analysis. It may be caused by the deposition of carbon compounds volatilized from the cell walls during pulse current heating.
KeywordsCell Wall Japanese Cedar Tangential Section Wood Cell Wall Carbonize Wood
The authors are grateful to Dr. Junji Sugiyama, RISH, for the experimental support with TEM. We are also thankful to Shuichi Muraishi, Renishaw and Toyoko Imai, Zeon Corporation, for the experimental support with polarized micro Raman Analysis. This research was carried out with support from Grant-in-Aid for Scientific Research (14002121) from the Ministry of Education, Science, and Culture of Japan.
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