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Photo Jan Forsman

Jan Forsman

Professor

Photo Jan Forsman

Repulsion between oppositely charged surfaces in multivalent electrolytes

Author

  • Martin Trulsson
  • Bo Jönsson
  • Torbjörn Åkesson
  • Jan Forsman
  • Christophe Labbez

Summary, in English

In answer to recent experimental force measurements between oppositely charged surfaces we here reproduce the repulsion in the presence of multivalent salt using Monte Carlo simulations within the primitive model. Our osmotic pressure curves are in good agreement with experimental results. In contrast with Poisson-Boltzmann calculations, both repulsion and charge inversion are seen in the simulations. Repulsion is observed only for conditions under which there is charge inversion at large separations. However, in these cases, the repulsion is present also at intermediate separations, where there is no charge inversion. The charge inversion is thereby not the cause of the repulsion. Instead the repulsion appears to be an effect of the large amount of excess salt in the slit. Both phenomena, however, are closely linked and a consequence of ion-ion correlations, promoted by a strong electrostatic coupling.

Department/s

  • Computational Chemistry

Publishing year

2006

Language

English

Publication/Series

Physical Review Letters

Volume

97

Issue

6

Document type

Journal article

Publisher

American Physical Society

Topic

  • Theoretical Chemistry (including Computational Chemistry)

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114