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Coupling between criticality and gelation in "sticky" spheres: A structural analysis

Abstract

We combine experiments and simulations to study the link between criticality and gelation in sticky spheres. We employ confocal microscopy to image colloid-polymer mixtures, and Monte Carlo simulations of the square-well (SW) potential as a reference model. To this end, we map our experimental samples onto the SW model. We find excellent structural agreement between experiments and simulations, both for locally favored structures at the single particle level and large-scale fluctuations at criticality. We follow in detail the rapid structural change of the critical fluid when approaching the gas-liquid binodal and highlight the role of critical density fluctuations for this structural crossover. Our results link the arrested spinodal decomposition to long-lived energetically favored structures, which grow even away from the binodal due to the critical scaling of the bulk correlation length and static susceptibility.

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Publication details

The article was received on 26 Feb 2018, accepted on 09 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8SM00389K
Citation: Soft Matter, 2018, Accepted Manuscript
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    Coupling between criticality and gelation in "sticky" spheres: A structural analysis

    D. Richard, J. Hallett, T. Speck and P. Royall, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00389K

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