The influence of ion binding and ion specific potentials on the double layer pressure between charged bilayers at low salt concentrations | Zendy

Mathias Boström | Zendy; Eduardo R. A. Lima | Zendy; Frederico W. Tavares | Zendy; Barry W. Ninham | Zendy

Open Access

The influence of ion binding and ion specific potentials on the double layer pressure between charged bilayers at low salt concentrations

Author(s) -

Mathias Boström,

Eduardo R. A. Lima,

Frederico W. Tavares,

Barry W. Ninham

Publication year - 2008

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.2873307

Subject(s) - ion , chemistry , double layer (biology) , hofmeister series , mica , adsorption , salt (chemistry) , chemical physics , cationic polymerization , inorganic chemistry , layer (electronics) , analytical chemistry (journal) , materials science , chromatography , polymer chemistry , organic chemistry , composite material

Measurements of surface forces between double-chained cationic bilayers adsorbed onto molecularly smooth mica surfaces across different millimolar salt solutions have revealed a large degree of ion specificity [Pashley et al., J. Phys. Chem. 90, 1637 (1986)]. This has been interpreted in terms of highly specific anion binding to the adsorbed bilayers. We show here that inclusion in the double layer theory of nonspecific ion binding and ion specific nonelectrostatic potentials acting between ions and the two surfaces can account for the phenomenon. It also gives the right Hofmeister series for the double layer pressure.

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