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Entropy of adsorption of mixed surfactants from solutions onto the air/water interface

Journal of the Chemical Society, Faraday Transactions

By:
, ,
DOI: 10.1039/FT9959103873

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Abstract

The partial molar entropy change for mixed surfactant molecules adsorbed from solution at the air/water interface has been investigated by surface thermodynamics based upon the experimental surface tension isotherms at various temperatures. Results for different surfactant mixtures of sodium dodecyl sulfate and sodium tetradecyl sulfate, decylpyridinium chloride and sodium alkylsulfonates have shown that the partial molar entropy changes for adsorption of the mixed surfactants were generally negative and decreased with increasing adsorption to a minimum near the maximum adsorption and then increased abruptly. The entropy decrease can be explained by the adsorption-orientation of surfactant molecules in the adsorbed monolayer and the abrupt entropy increase at the maximum adsorption is possible due to the strong repulsion between the adsorbed molecules.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Entropy of adsorption of mixed surfactants from solutions onto the air/water interface
Series title:
Journal of the Chemical Society, Faraday Transactions
DOI:
10.1039/FT9959103873
Volume
91
Issue:
21
Year Published:
1995
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
3873
Last page:
3878
Number of Pages:
6