Very long-range attractive and repulsive forces in Model Colloidal Dispersions
Abstract
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.
Cite
@article{arxiv.1812.03329,
title = {Very long-range attractive and repulsive forces in Model Colloidal Dispersions},
author = {Alfredo González-Calderón and Enrique González-Tovar and Marcelo Lozada-Cassou},
journal= {arXiv preprint arXiv:1812.03329},
year = {2019}
}
Comments
16 pages, seven figures. ECIS-2018