二元混合物相分离动力学与花样演化(CDS格子气模拟)机理研究  

Phase Separation Dynamics of Binary Mixturesand Pattern Formation

作　　者：陆章基[1] 陈猛[1] 陈守吉[1] 

机构地区：[1]复旦大学力学与工程科学系

出　　处：《复旦学报（自然科学版）》2002年第5期487-494,共8页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金重点资助项目(19832050;10172092);上海市科技发展基金资助项目(98JC14032)

摘　　要：用元胞动力系统(CDS)格子气方法研究二组分混合物相分离花样演化若干特性.主要结果是:(1)元胞自身演化映射f的四种不同选取尽管"宏花样"("黑白花样")拓扑结构相似,但"微花样"("灰度花样")有明显差异,f2和f4所对应的花样在纯黑与纯白区域都存在更加精细的鱼鳞状结构;(2)双嵌段共聚物二组分不对称(即r≠0 5)时,在0 43≤r≤0 45范围内出现文献中尚未报道过的"颗粒-条状杂交花样";(3)首次实施了六方格CDS模拟,特点是"叠代过程用六方格,涂色用四方格",结果表明六方格的确具有各向同性性好、稳定性好等优点;(4)Laplace平均算子 的不同选取对相变花样影响不大.Several properties of phase seperating pattern for binary mixed materials are investigatd by cell dynamics system (CDS) lattics gas method. The main results are as follows:(1)For the four different selections f1-f4 of the self evolution map f at a cell,even though the topological structures of 'macropattern' ('blackandwhite graph') are similar,there are evident differences in their 'micropattern'('grayscale graph'). The correspondent patterns of f2 and f4 have fine scalelike microstructures in the pure black domains and the pure white domains;(2)For nonsymmetry diblock copolymers,there are a 'grainstrip cross pattern'at the range of r∶0.43≤r≤0.45;(3)The hexagon lattice gas simulation have been performed. The computed results show that there are the follow excellence:Good isotropic behavior,nice numerical stability;(4)About the different selections of the Laplacian oprater ? ?,there arent evident effects on the evolution patterns.

关 键 词：二元混合物 相分离动力学 花样演化 CDS格子气模拟 格子气自动机 元胞动力系统 演化机理 相变 

分 类 号：O414.13[理学—理论物理]