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

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 Yukawa-like 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 potential. 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.

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Publication details

The article was received on 04 Mar 2018, accepted on 14 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8SM00441B
Citation: Soft Matter, 2018, Accepted Manuscript
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    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, Accepted Manuscript , DOI: 10.1039/C8SM00441B

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