Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-09-16
Physics
Condensed Matter
Soft Condensed Matter
24 pages, 10 figures, to appear in Journal of Physics: Condensed Matter
Scientific paper
Dynamic equations are presented for polar binary mixtures containing ions in the presence of the preferential solvation. In one-phase states, we calculate the dynamic structure factor of the composition accounting for the ion motions. Microphase separation can take place for sufficiently large solvation asymmetry of the cations and the anions. We show two-dimensional simulation results of the mesophase formation with an antagonistic salt, where the cations are hydrophilic and the anions are hydrophobic. The structure factor S(q) in the resultant mesophase has a sharp peak at an intermediate wave number on the order of the Debye-Huckel wave number. As the quench depth is increased, the surface tension nearly vanishes in mesophases due to an electric double layer.
Araki Takeaki
Onuki Akira
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