Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 230, Issue 1, Pages 107-113Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcis.2000.7060
Keywords
adsorption isotherm; surface tension; activity coefficient
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Adsorption isotherms for concentrated aqueous-organic solutions are presented. These are calculated from the Gibbs adsorption equation, using surface tension and activity coefficient experimental data. General considerations reveal that two maxima may be expected in the adsorption isotherm. Moreover, close to phase separation, the adsorption isotherm may show singularities. Calculations for specific examples support these general predictions. The calculated adsorption isotherms are qualitatively different from existing theoretical models due to the high concentrations involved and to the nonideality of the solutions. (C) 2000 Academic Press.
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