多孔膜成孔机理的分形研究  

THE FRACTAL STUDY OF THE FORMATION MECHANISM OF SURFACE PORES IN MEMBRANE

作　　者：吴秋林[1] 吴邦明 彭美生[3] 赵瑞兰[3] 

机构地区：[1]清华大学核能技术设计研究院,102201 [2]广东惠州纺织集团总公司 [3]中科院生态环境研究中心

出　　处：《水处理技术》1993年第4期201-208,共8页Technology of Water Treatment

基　　金：国家自然科学基金

摘　　要：本文通过对多孔膜(包括高分子相分离形成膜、核孔膜、烧结陶瓷膜等)表面进行电镜照像和计算机图象分析,揭示了膜孔形的分形特性。把孔周长(P)与孔当量孔径(d)之间的指数关系定义为孔形的分形维数,即lnP=D_flnd+c式中D_f即为孔形的分形维数。测定及分析结果表明,D_f值表示孔的不规则性,不同的D_f值反映不同的孔类型,即不同的成孔机理。In this paper the fractal characteristics of membrane pores were revealed by electron microscopic image analysis of surface pores in membranes (including polymer membranes prepared by phase conversion process, nuclepore membranes and ceramic membranes). The fractal dimension of membrane pores was defined by the exponential relationship between pore perimeter and its equivalent diameter, i. e. lnP=D_flnd+c, where D_f—fractal dimension of membrane pore. The results of study show that the value of D_f represents the degree of irregularity of membrane pore. The different D_f values show the different types of membrane pores and their different formation mechanisms.

关 键 词：膜 多孔膜 成孔机理 分形 

分 类 号：TQ028.8[化学工程]