Large effects of tiny structural changes on the cluster formation process in model colloidal fluids: an integral equation study

Jean-Marc Bomont; Dino Costa; Jean-Louis Bretonnet; Jean-Marc Bomont; Dino Costa; Jean-Louis Bretonnet

doi:10.3934/matersci.2020.2.170

AIMS Materials Science

2020, Volume 7, Issue 2: 170-181. doi: 10.3934/matersci.2020.2.170

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Research article

Large effects of tiny structural changes on the cluster formation process in model colloidal fluids: an integral equation study

1.
Université de Lorraine, LCP-A2MC UR 3469, 1 Bd. F. Arago, Metz, France
2.
Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra Università degli Studi di Messina, Viale F. Stagno d’Alcontres 31, 98166 Messina, Italy

Received: 17 February 2020 Accepted: 17 April 2020 Published: 27 April 2020

The formation of aggregates is commonly observed in soft matter such as globular protein solutions and colloidal suspensions. A lively debated issue concerns the possibility to discriminate between a generic intermediate-range order taking place in the fluid, as contrasted with the more specific presence of a clustered state. Recently, we have predicted by Monte Carlo simulations of a standard colloidal model — spherical particles interacting via a short-range attraction followed by a screened electrostatic repulsion at larger distances — the existence of a tiny structural change occurring in the pair structure. This change consists in a reversal of trend affecting a portion of the local density as the attractive strength increases, that is shown to take place precisely at the clustering threshold. Here, we address the same issue by refined thermodynamically self-consistent integral equation theories of the liquid state. We document how such theoretical schemes positively account for the observed phenomenology, highlighting their accuracy to finely describe the aggregation processes in model fluids with microscopic competing interactions.
- colloidal suspensions,
- cluster formation process,
- competing interactions,
- clustering threshold,
- simulation,
- integral equation theories
Citation: Jean-Marc Bomont, Dino Costa, Jean-Louis Bretonnet. Large effects of tiny structural changes on the cluster formation process in model colloidal fluids: an integral equation study[J]. AIMS Materials Science, 2020, 7(2): 170-181. doi: 10.3934/matersci.2020.2.170

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Abstract

The formation of aggregates is commonly observed in soft matter such as globular protein solutions and colloidal suspensions. A lively debated issue concerns the possibility to discriminate between a generic intermediate-range order taking place in the fluid, as contrasted with the more specific presence of a clustered state. Recently, we have predicted by Monte Carlo simulations of a standard colloidal model — spherical particles interacting via a short-range attraction followed by a screened electrostatic repulsion at larger distances — the existence of a tiny structural change occurring in the pair structure. This change consists in a reversal of trend affecting a portion of the local density as the attractive strength increases, that is shown to take place precisely at the clustering threshold. Here, we address the same issue by refined thermodynamically self-consistent integral equation theories of the liquid state. We document how such theoretical schemes positively account for the observed phenomenology, highlighting their accuracy to finely describe the aggregation processes in model fluids with microscopic competing interactions.

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