Phase separation in binary colloids with charge asymmetry

Details Phase separation in binary colloids with charge asymmetry Phase separation in binary colloids with charge asymmetry

2012-03-03

arxiv.org/abs/1203.0663v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We report that binary dispersions of like-charged colloidal particles with large charge asymmetry but similar size exhibit phase separation into crystal and fluid phases under very low salt conditions. This is unexpected because the effective colloid-colloid pair interactions are accurately described by a Yukawa model which is stable to demixing. We show that colloid-ion interactions provide an energetic driving force for phase separation, which is initiated by crystallization of one species.

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