Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 422, Issue -, Pages 54-57Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.02.003
Keywords
Surface tension; Air/water interface; pH; Gibbs isotherm; Salt effect
Categories
Funding
- Australian Research Council
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Despite the strong adsorption of hydroxide ions, the surface tension of water is almost independent of pH between pH 1 and 13 when the pH is adjusted by addition of HCl or NaOH. This is consistent with the Gibbs adsorption isotherm which measures the surface excess of all species in the double layer, if hydronium ions and hydroxide ions are adsorbed and sodium and chloride ions are not. The surface tension becomes pH dependent around pH 7 in millimolar NaCl or KCl solutions, for now sodium ions can replace hydronium ions as counterions to the adsorbed hydroxide ions. (c) 2014 Elsevier Inc. All rights reserved.
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