The effect of attractions on the local structure of liquids and colloidal fluids

Date

2010-12-28

Authors

Taffs, Jade
Malins, Alex
Williams, Stephen R.
Royall, C. Patrick

Journal Title

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Volume Title

Publisher

American Institute of Physics (AIP)

Abstract

We revisit the role of attractions in liquids and apply these concepts to colloidal suspensions. Two means are used to investigate the structure; the pair correlation function and a recently developed topological method. The latter identifies structures topologically equivalent to ground state clusters formed by isolated groups of 5 < m < 13 particles, which are specific to the system under consideration. Our topological methodology shows that, in the case of Lennard-Jones, the addition of attractions increases the system's ability to form larger (m>8) clusters, although pair-correlation functions are almost identical. Conversely, in the case of short-ranged attractions, pair correlation functions show a significant response to adding attraction, while the liquid structure exhibits a strong decrease in clustering upon adding attractions. Finally, a compressed, weakly interacting system shows a similar pair structure and topology.

Description

Keywords

Keywords: Colloidal fluids; Colloidal suspensions; Ground state cluster; Interacting system; Lennard jones; Liquid structures; Local structure; Pair correlation functions; Topological methods; Suspensions (fluids); Topology

Citation

Source

Journal of Chemical Physics

Type

Journal article

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DOI

10.1063/1.3516210

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