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 journalArticle

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

Fingerprint

ion distribution
Solvation
Ionization
solvation
rods
Phase transitions
Ions
ionization
critical point
Chemical analysis
dependent variables
Charged particles
charged particles
curves
interactions

ASJC Scopus subject areas

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

Cite this

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