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Thermodynamics of anisotropic surfactant micelles. I. The influence of the curvature free energy on the micellar size and shape
YKI – Ytkemiska institutet.
2000 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 113, 5559-5568 p.Article in journal (Refereed)
Abstract [en]

A novel theory for the structural behavior of surfactant micelles is expounded. The micelles are considered to be generally shaped as triaxial tablets with distinct thickness width and length, respectively, and may become spherical, spherocylindrical or disk-shaped in the special cases where two or more of the dimensions are equal. It is demonstrated that the average width and length of a tablet-shaped micelle with a fixed thickness is mainly determined by two constants, k1 and k2, related to the first and second order correction in curvature of the micellar end caps. The size of the micelles is found to be mainly determined by k1, whereas k2 influences the shape, i.e., the length-to-width ratio, of the micelles so that the micellar size increases with increasing k1 and the length-to-width ratio decreases with increasing k2. Hence, large positive values of k2 promote the formation of tablets rather than very long spherocylinders. An additional parameter related to the curvature of the straight cylindrical rims may influence the structure of the tablet-shaped micelles insofar k2 is close to or below zero.

Place, publisher, year, edition, pages
2000. Vol. 113, 5559-5568 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26646OAI: oai:DiVA.org:ri-26646DiVA: diva2:1053649
Note
A1404Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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