稳态时剪应力作用下肢体簇团形成/破裂的机理

胶体簇团形成／破裂过程机理研究一直是胶体研究中一个十分活跃的领域．因为不同的聚团机理导致胶体不同的物理化学性质：粘度、空隙度、导电性甚至光学特性等，因而使其备受注目．当前，实验研究证明了簇团边缘的胶体颗粒和介质有着频繁的交换’‘’，特别是在受到外力的作用下，这种交换会更加激烈．计算机模拟研究证实了簇团和介质间颗粒交换的机理可以是颗粒一颗粒型的，也可以是簇团一簇团型的”、”．所谓颗粒一颗粒型机理是指（接近或完全）由单个颗粒互相结合，或单个颗粒被结合进大的簇团．在结合期间，被结合的颗粒可以在簇团边缘…

Study on Mechanism of Breakage and Coalescence of Colloidal Aggregates at Steady-state under Shear

Population correlation function P(t) has been used to examine the mechanism of breakage and coalescence of clusters at steady-state under shear, the results are in qualitative a greement with exPeriments. The research indicates that with a weak potential the mechanism of breakage and coalescence of clusters at steady-state under shear is predomnately controlled by the paticle-particle model, but that with a strong potential the mechanism shifts to that of clustercluster for large clusters; for small clusters, however, the mechanism of particle-particle model seems still to remain predondnate, further work needs to be done.