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Monolayer properties of fatty acids:II. Behenic acid

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
21
Issue
3
Identifiers
DOI: 10.1016/0095-8522(66)90016-x

Abstract

Abstract The monolayer characteristics of behenic acid upon subsolutions from pH 2 to 14 are presented. The influence of atmospheric CO 2 on these characteristics has been investigated ( 1) by performing experiments in a CO 2-free atmosphere and ( 2) by using various buffers. CO 2 absorbed into the surface region is shown to exert appreciable buffering activity; this results in an increase in the pH of expansion of the monolayer and an increase in the surface potential ( ΔV) in the pH range 6–10.5 for unbuffered systems. The corrected ΔV-pH curve differs appreciably from previous curves obtained with buffered solutions. A theoretical ΔV-pH curve, based on the Gouy model and on dissociation via the acid-soap species, is in good agreement with the experimental curve. The surface moment of the car☐ylate ion was estimated for the calculations.

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