外场导致的分形体的结构及偶分布函数

外场导致的分形体的结构及偶分布函数 Field-Induced Structure and Pair Distribution Function of Fractals 李洪 LI Hong 1 first-author 谭志杰 TAN Zhi jie 1 张卫 ZHANG Wei 1 邹宪武 ZOU Xian wu 1 武汉大学物理学系,武汉,430072 武汉大学物理学系,武汉,430072 Department of Physics, Wuhan University Department of Physics, Wuhan University 用计算机模拟 ,研究了电场下的团簇 -团簇凝聚 （CCA ）和扩散限制凝聚 （DL A）的结构转变 .结果显示 ,当电场由弱到强时 ,凝聚体从典型的无序向有序结构转变 ,即从 DL A和扩散 CCA分形体向沿电场方向的链状结构转变 .凝聚体的偶分布函数显示 ,随着外场的增强 ,体系逐渐从局域有序向长程有序过渡 .这些结果有利于加深人们对电场下 CCA和 DL A的认识和电场下胶体聚集现象的理解 The structure transitions in cluster cluster aggregation （CCA） and diffusion limited aggregation（DLA） under external electric fields have been investigated by computer simulations. With the increase of external electric field, there exists a structure transition from disorder to order, i.e., the aggregates change from fractals of diffusion limited CCA and DLA to the electrorheological chains parallel to electric field. Pair distribution shows, the system changes from local order to long range order gradually with the external field rising. 团簇-团簇凝聚 扩散限制凝聚 结构 电流变液链 偶分布函数 cluster-cluster aggregation diffusion-limited aggregation structure transition electrorheological chain pair distribution function 10.14188/j.1671-8836.2000.03.025 O782.9 国家自然科学基金!（196740 42,19834070）;教育部重点科学技术基金资助项目 2000-03-01 2021-04-01 3