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

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

2011-01-09

arxiv.org/abs/1101.1644v1

J. Chem. Phys. 133 244901 (2010)

Physics

Condensed Matter

Soft Condensed Matter

22 pages

Scientific paper

10.1063/1.3516210

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.

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