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Surfactant aggregation in systems containing alkanol amines and fatty acids
YKI – Ytkemiska institutet.
1990 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 138, p. 314-323Article in journal (Refereed)
Abstract [en]

The phase diagrams of six different alkanolammonium carboxylate-water systems have been determined. Their phase behavior differs from that of ordinary soaps, since there are large differences between the systems for varying alkyl chain lengths of the carboxylate. In addition, the chemical structure of the alkanolammonium counterion also affects the phase equilibria. For short alkyl chain carboxylates the liquid crystalline phases disappear (e.g., for triethanolammonium octanoate) or decrease in extension (e.g., for monoethanolammonium octanoate), although the surfactant readily aggregates in solution. In contrast, long alkyl chain carboxylates behave like swelling amphiphiles with a low aqueous solubility and the immediate formation of a lamellar phase (e.g., for tri-and monoethanolammonium oleate). It is shown that the distrubition between acid and soap causes these effects. The lower surface charge of the surfactant aggregates compared to that of orinary soap micelles is also reflected in a lowering of the critical micellization concentration.

Place, publisher, year, edition, pages
1990. Vol. 138, p. 314-323
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26792OAI: oai:DiVA.org:ri-26792DiVA, id: diva2:1053795
Note
A627Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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