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Phase equilibria in two aqueous chiral surfactant systems
Mid Sweden university.ORCID iD: 0000-0002-9577-832X
1997 (English)In: Progress in Colloid and Polymer Science, ISSN 0340-255X, Vol. 105, 360-364 p.Article in journal (Refereed) Published
Abstract [en]

In this study, we present the binary phase diagrams of the pure (R)- and the racemic aqueous sodium-2-methyldecanoate surfactant systems. The latter is a 1:1 mixture of the pure (S)- and pure (R)-form. The systems were investigated using crossed polaroids, polarizing optical microscope and 2HNMR splittings. Both systems form a micellar phase, followed by a hexagonal, some intermediate phase and a large cubic phase. At even higher concentrations, the 2HNMR studies showed larger quadrupolar splittings up to 1200 Hz, due to a lamellar phase. The intermediate phase was in both cases very narrow, and extended up to > 23°C in the racemic system and up to 30°C in the pure (R)-system. The similarity between these two binary phase diagrams indicates that the change in molecular packing is so small that it does not drastically affect the phase behavior. The Krafft temperature in the micellar phase in both systems is 1°C, which is very low compared to that of unsubstituted alkanoates with the same chain length.

Place, publisher, year, edition, pages
1997. Vol. 105, 360-364 p.
Keyword [en]
Chiral, Deuteron NMR, Phase equilibria, Sodium-2-methyldecanoate, Surfactant system
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-74866OAI: diva2:490128
References: HagslÀtt, H., Söderman, O., Jönsson, L.B.-Å., (1991) J Phys Chem, 95, pp. 1703-1710; Bijma, K., Engberts, J.B.F.N., Haandrikman, G., Van Os, N.M., Blandamer, M.J., Butt, M.D., Cullis, P.M., (1994) Langmuir, 10, pp. 2578-2582. , and references therein; Edlund, H., Lindholm, A., Carlsson, I., Lindström, B., Hedenström, E., Khan, A., (1994) Progr Colloid Polym Sci, 97, pp. 134-140; Evans, F.D., Wennerström, H., (1994) The Colloidal Domain, , VCH Publishers, USA; Berglund, P., Holmquist, M., Hedenström, E., Hult, K., Högberg, H.-E., (1993) Tetrahedron: Asymmetry, 4, pp. 1869-1878; Khan, A., Fontell, K., Lindman, B., (1984) J Colloid Interface Sci, 101, p. 193; Wennerström, H., Persson, N.-O., Lindman, B., (1975) Colloidal Dispersions and Micellar Behavior ACS Symp Ser 9, p. 253. , Mittal KL (ed) American Chemical Society, Washington, DC; Wennerström, H., Lindblom, G., Lindman, B., (1974) Chem Scr, 6, p. 97; Persson, N.-O., Fontell, K., Lindman, B., Tiddy, G.J.T., (1975) J Colloid Interface Sci, 53, p. 461; Ulmius, J., Wennerström, H., Lindblom, G., Arvidson, G., (1977) Biochemistry, 16, p. 5742; Rendall, K., Tiddy, G.J.T., Trevethan, M.A., (1983) J Chem Soc, Faraday Trans 1, 79, p. 637 NR 20140805Available from: 2012-02-03 Created: 2012-02-03 Last updated: 2012-02-03Bibliographically approved

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