Spinodal fractionation in a polydisperse square well fluid

Details Spinodal fractionation in a polydisperse square well fluid Spinodal fractionation in a polydisperse square well fluid

2012-02-17

arxiv.org/abs/1202.3982v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

Using Kinetic Monte Carlo simulation, we model gas-liquid spinodal decomposition in a size-polydisperse square well fluid, representing a 'near-monodisperse' colloidal dispersion. We find that fractionation (demixing) of particle sizes between the metastable phases begins asserting itself shortly after the onset of phase ordering. The direction of fractionation displays a striking qualitative dependence on a seemingly trivial detail of the inter-particle potential which, in the monodisperse case, would not even constitute a distinction - we rationalise this in terms of a perturbative, equilibrium theory of polydispersity. Furthermore, our quantitative results show that dynamical simulation can provide detailed insight into the role of fractionation in real colloidal systems.

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