关键词: 微纤丝, 超微结构, 原子力显微镜 , 异质性, 表面粗糙度

Abstract: The examinations of cotton cell walls by atomic force microscopy show that the supermolecular structure is heterogeneous, and the cotton fibres contain microfibrils which are the main structural units of cell walls. These microfibrils are arranged in two fashions, one is cross fashion, and the other is parallel fashion. These arrangements are more orderly than those in the other plant cell walls. Partial hydration of cell walls indicates that the sensitivity of microfibrils to the crude cellulase differs in different arrangement fashions. The examination by AFM indicates that the inhomogeneous ultrustructure of microfibrils and the different arrangement fashions of microfibrils cause the heterogeneousness of cotton fibres. Surface roughness, a statistic parameter for whole surface structure, can be a criterion to measure and monitor the ultrastructure and their changes combining with XRD and FTIR results.

Key words: atomic force microscope , heterogeneity, surface roughness, ultrastructure, microfibrils