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Citation: XIONG Hai-Ling, YUAN Yong-Zhi, LI Hang, ZHU Hua-Ling, JIANG Xian-Jun. Computer Simulation of Colloidal Aggregation Induced by Directionalism of Long Range van der Waals Forces[J]. Acta Physico-Chimica Sinica, ;2007, 23(08): 1241-1246. doi: 10.3866/PKU.WHXB20070819 shu

Computer Simulation of Colloidal Aggregation Induced by Directionalism of Long Range van der Waals Forces

1.
College of Computer and Information Science, Southwest University, Chongqing 400715, P. R. China; College of Resource and Environment, Southwest University, Chongqing 400715, P. R. China

Received Date: 8 January 2007
Available Online: 29 May 2007

Colloidal aggregation within the context of long range van der Waals forces was studied by computer simulations. The motion of colloidal particles or clusters was guided by the long range van der Waals forces. Compared to the diffusion limited cluster aggregation (DLCA), which takes no account of the guiding effect, the directionalism of van der Waals forces not only accelerates the aggregation velocity but also results in morphologies of clusters with higher density and higher fractal dimensions. The directionalism arising from long range van der Waals forces was very sensitive to the initial concentration of particles. Whether on the morphology or on the aggregating velocity, the directionalism was distinct only at low initial concentration of particles. The possible reason was that, at a high particle concentration condition, both a short average random range and the steric effect of particles may screen the guiding effect.
- Long range van der Waals forces; Attraction driven cluster aggregation; Directionalism; Steric effect
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