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The physicochemical behavior of phytosterol ethoxylates
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 213, p. 112-120Article in journal (Refereed)
Abstract [en]

In this work the physicochemical behavior of a series of phytosterol ethoxylates in water is presented. The influence of the length of the polyoxyethylene chain is studied. The surfactant solutions have been examined by means of birifringent microscopy, surface tension, self diffusion 1H-NMR, dynamic and static light scattering, and rheology. The surfactants with a hydrophilic chain of 10 oxyethylene units or more gave a micellar region. The CMC values were generally very low and a reverse relationship between the CMC value and the polyoxyethylene chain length was obtained. The time required to reach equilibrium surface tension was very long, more then 150 minutes. For the hydrophobic surfactants large lamellar regions appeared while for the more hydrophilic surfactants cubic and hexagonal structures were present which remained stable up to temperatures of 100°C. In the micellar region prolate aggregates were formed which showed 'ghostlike' behavior, consisting of crossliked micelles with very fast relaxation times.

Place, publisher, year, edition, pages
1999. Vol. 213, p. 112-120
Keywords [en]
Phytosterol ethoxylated surfactants, nonionic surfactants, physico-chemical behavior, tensiometry, phase behavior, diffusion-NMR, light scattering, rheology
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26719OAI: oai:DiVA.org:ri-26719DiVA, id: diva2:1053722
Note
A1236Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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