Excess Charge Density and its Relationship with Surface Tension Increment at the Air-Electrolyte Solution Interface

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The adsorption isotherms of probe cationic molecules were measured at various electrolyte solution interfaces by resonant second harmonic generation. The excess charge density was obtained by analyzing the isotherms; it increases with square root of the bulk electrolyte concentration. Its value is ion-specific and the amount of probe molecular adsorption follows the Hofmeister series. By calculating the pressure anisotropy at the interface, it is found that the ratio of surface tension increment to the bulk electrolyte concentration decreases with the square of the excess charge density. This is in good agreement with the experimental observations.
Publisher
AMER CHEMICAL SOC
Issue Date
2011-03
Language
English
Article Type
Article
Keywords

SALT-SOLUTIONS; BULK WATER; HYDRATION; HALIDES

Citation

JOURNAL OF PHYSICAL CHEMISTRY B, v.115, no.8, pp.1856 - 1862

ISSN
1520-6106
DOI
10.1021/jp110921m
URI
http://hdl.handle.net/10203/95014
Appears in Collection
PH-Journal Papers(저널논문)
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