Ion distribution around a charged rod in one and two component solvents: Preferential solvation and first order ionization phase transition

Ryuichi Okamoto, Akira Onuki

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In one and two component polar solvents, we calculate the counterion distribution around an ionizable rod treating the degree of ionization α as an annealed variable dependent on its local environment. In the two component case, we take into account the preferential solvation of the charged particles and the short-range interaction between the rod and the solvent. It follows a composition-dependent mass action law. The composition becomes heterogeneous around a charged rod on a mesoscopic scale, strongly affecting the counterion distribution. We predict a first order phase transition of weak-to-strong ionization for hydrophobic chains. This transition line starts from a point on the solvent coexistence curve and ends at an ionization critical point. The composition heterogeneity is long-ranged near the solvent critical point.

Original languageEnglish
Article number094905
JournalJournal of Chemical Physics
Volume131
Issue number9
DOIs
Publication statusPublished - Sep 14 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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