Koki Yoshizawa, Nao Wakabayashi, Masakatsu Yonese, Junpei Yamanaka, C. Patrick Royall
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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http://arxiv.org/abs/1203.0663
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