The effect of attractions on the local structure of liquids and colloidal fluids
arXiv:1101.1644 · doi:10.1063/1.3516210
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.
22 pages
References in corpus (4)
- Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures
- A repulsive reference potential reproducing the dynamics of a liquid with attractions
- How short-range attractions impact the structural order, self-diffusivity, and viscosity of a fluid
- Topological Classification of Clusters in Condensed Phases