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arXiv 1812.03329cond-mat.soft
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模型胶体分散体系中的长程吸引力和排斥力

Very long-range attractive and repulsive forces in Model Colloidal Dispersions

Alfredo González-Calderón, Enrique González-Tovar, Marcelo Lozada-Cassou

摘要:

聚合物胶乳溶液的实验表明,大离子的有序-无序结构共存。由于大离子的尺寸,这种有序-无序相共存意味着存在非常长的吸引力和排斥力,这不能用常规的直接相互作用势来解释,这是短程的。在这里,我们应用积分方程理论的胶体分散体的一个简单的模型,在有限的浓度,计算粒子的分布函数和所涉及的有效力。我们发现在带相同电荷的大离子之间存在着很长的吸引力和排斥力。分布函数与实验结果定性一致。这些部队的起源进行了讨论的能量熵平衡。

英文摘要:

Experiments with polymer latex solutions show the coexistence of order-disorder structures of macroions. Because of the large macroions' sizes, this order-disorder phase coexistence imply the existence of very long-range attractive and repulsive forces, which can not be explained in terms of conventional direct interaction potentials, which are short-range. Here we apply an integral equations theory to a simple model for colloidal dispersions, at finite concentrations, calculate the particles distribution functions and the involved effective forces. We find very long-range attractive and repulsive forces among the like-charged macroions. The distribution functions are in qualitative agreement with experimental results. The origin of these forces are discussed in terms of an energy-entropy balance.

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