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Issue 24, 2018
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Quenching of fully symmetric mixtures of oppositely charged microgels: the role of soft stiffness

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Abstract

Using molecular dynamics simulations, we investigate the self-assembly of a coarse-grained binary system of oppositely charged microgels, symmetric in size and concentration. The microgel pair interactions are described by an effective pair potential which implicitly accounts for the averaged ionic contributions, in addition to a short-range elastic repulsion that accounts for the overlapping of the polymer chains, the latter being described by the Hertzian interaction. Particular emphasis is placed on the role played by the strength of the soft repulsive interaction on the resulting particle aggregation. It is found that the possibility of particle inter-penetration in oppositely charged soft particles results in a much wider variety of cluster morphologies in comparison with their hard-spheres counterparts. Specifically, the softness of the steric interactions enhances the competition between repulsive and attractive electrostatic interactions, leading to the formation of aggregates that are comprised of strongly bounded charged particles displaying a low degree of charge ordering.

Graphical abstract: Quenching of fully symmetric mixtures of oppositely charged microgels: the role of soft stiffness

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Supplementary files

Article information


Submitted
04 Mar 2018
Accepted
14 May 2018
First published
17 May 2018

Soft Matter, 2018,14, 5106-5120
Article type
Paper

Quenching of fully symmetric mixtures of oppositely charged microgels: the role of soft stiffness

T. Colla, R. Blaak and C. N. Likos, Soft Matter, 2018, 14, 5106 DOI: 10.1039/C8SM00441B

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