Effect of Roughness on Energy of Repulsion between Colloidal Surfaces
Effect of Roughness on Energy of Repulsion between Colloidal Surfaces
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DOI：
10.1006/jcis.1995.1166
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发表时间：
1995-04
期刊：
影响因子：
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通讯作者：
M. Kostoglou;A. Karabelas
中科院分区：
文献类型：
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作者：
M. Kostoglou;A. Karabelas
表面粗糙度在颗粒的沉积和凝聚中起着非常重要的作用，特别是在有排斥力的情况下。本文提出了一种简单的粗糙表面模型来评价双层相互作用。该模型允许通过考虑两个表面之间的粗糙度相互作用来估计两个表面之间的切向力。研究了求解该数学问题的解析方法和数值方法。在很大的模型参数范围内考察了它们的精度、稳定性和计算效率。在表面电势恒定、粗糙度小于双层厚度的情况下，研究了这些参数对排斥能的影响。简单模型的结果可以推广到任意表面粗糙度，至少可以定性地推广。
Abstract Surface roughness plays a very important role in particle deposition and coagulation, especially in the presence of repulsion forces. A simple model of rough surfaces is proposed in this work for evaluating double-layer interactions. The model allows estimation of the tangential forces between two surfaces by taking into account the interaction of their asperities. Analytical and numerical methods are examined for the solution of the mathematical problem. Their accuracy, stability, and computational efficiency are investigated over a large range of model parameters. The influence of these parameters on the repulsion energy is studied for the case of constant surface potential and asperities smaller than double-layer thickness. The results of the simple model can be generalized, at least qualitatively, for arbitrary surface roughness.