具有多体效应的胶体聚团的特征

考察了多体效应（用Ｓｔｕｔｔｏｎ－Ｃｈｅｎ势，ＳＣ）对胶体聚团的影响并与双体（ＬＪ）势下的结果作了比较。研究表明，ＳＣ和ＬＪ势下簇团的性质有其相似的一面，如：随着剪应力的增加，系统里颗粒的平均势能增加，而每个簇团的颗粒数减少；在较强的剪应力场里，簇团沿剪应力方向（Ｘ轴）被明显拉长且其主轴偏离Ｘ轴等。但它们间的差异也是明显的，在剪应力下ＳＣ系统内颗粒排列得更合理，从而使得平均位能比ＬＪ系统低约１－３

Characteristics of Colloidal Aggregates with Many-body Effect

Effects of many-body (by Suttoll-Chen Potential, SC) on colloidal aggregates have have been exammed and compared with that ot two-body (by Lennard-Jones potential, LJ)Some characteristics were similar in both SC and LJ systems such as potential energy increased, and the number of particles in a cluster decreased wtih increasing shear rates; clusters were stretched remarkably in shear (X axis) direction and the longest axis of clusters deviated from X axis under stronger shear held; etc. Their differences were also obvious : arrangement of particles in SC system wasmore reasonable than in LJ system so that the potential energy in SC system was lower 1-3 dimensionless energy umts, thereby clusters in SC system were closer and their fractal dimension higher;dependent of petential energy for particles, average cluster size and fractal dimension on shearrates was weaker in SC than in LJ systems; morphologies of clusters were occasionally changed to some extent.