Unusual phase behaviour from peculiar pair potentials: A density-functional-perturbation study
Applying a density-functional-based perturbation theory, we examine the phase behaviour of model colloidal systems characterized by hard core and additional piecewise-constant repulsive or attractive interactions. For sufficiently narrow square-shoulder repulsions, the theory predicts coexistence between expanded and condensed isostruc tural (f.c.c.) crystals, in quantitative agreement with available simulation data. A square-well attraction of equal width results in a solid-solid critical point at lower density and higher temperature and a significantly wider coexistence region. Adding a constant long-ranged attraction leads to a novel phase diagram exhibiting a quadruple point, where two fluid phases and two solid phases coexist simultaneously.
Key wordsColloids phase behaviour density functional theory
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