Re-entrant melting and freezing in a model system of charged colloids

Details Re-entrant melting and freezing in a model system of charged colloids Re-entrant melting and freezing in a model system of charged colloids

2005-12-27

arxiv.org/abs/cond-mat/0512666v1

Physics

Condensed Matter

Soft Condensed Matter

25 pages, 5 figures 1 table

Scientific paper

10.1063/1.2189850

We studied the phase behavior of charged and sterically stabilized colloids using confocal microscopy in a less polar solvent (dielectric constant 5.4). Upon increasing the colloid volume fraction we found a transition from a fluid to a body centered cubic crystal at 0.0415+/-0.0005, followed by re-entrant melting at 0.1165+/-0.0015. A second crystal of different symmetry, random hexagonal close-packed, was formed at a volume fraction around 0.5, similar to that of hard spheres. We attribute the intriguing phase behavior to particle interactions that depend strongly on volume fraction, mainly due to changes in the colloid charge. In this low polarity system the colloids acquire charge through ion adsorption. The low ionic strength leads to fewer ions per colloid at elevated volume fractions and consequently a density-dependent colloid charge.

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