Ion-specific hydration effects: Extending the Poisson-Boltzmann theory

Dan Ben-Yaakov, David Andelman, Rudi Podgornik, Daniel Harries

Research output: Contribution to journalReview articlepeer-review


In aqueous solutions, dissolved ions interact strongly with the surrounding water and surfaces, thereby modifying solution properties in an ion-specific manner. These ion-hydration interactions can be accounted for theoretically on a mean-field level by including phenomenological terms in the free energy that correspond to the most dominant ion-specific interactions. Minimizing this free energy leads to modified Poisson-Boltzmann equations with appropriate boundary conditions. Here, we review how this strategy has been used to predict some of the ways ion-specific effects can modify the forces acting within and between charged interfaces immersed in salt solutions.

Original languageEnglish
Pages (from-to)542-550
Number of pages9
JournalCurrent Opinion in Colloid and Interface Science
Issue number6
StatePublished - Dec 2011


  • Electrostatic interactions
  • Forces between charged surfaces
  • Hydration forces
  • Ion specific interactions
  • Poisson-Boltzmann theory

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry


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