Title
Inverted micellar structure determination of zinc-di-iso-hexadecyl-sulfonate in isododecane by small angle X-ray scattering and vapour pressure loweringInverted micellar structure determination of zinc-di-iso-hexadecyl-sulfonate in isododecane by small angle X-ray scattering and vapour pressure lowering
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
New York, N.Y.,
Subject
Chemistry
Source (journal)
Journal of colloid and interface science. - New York, N.Y.
Volume/pages
81(1981):2, p. 341-353
ISSN
0021-9797
ISI
A1981LU66600006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Small-angle X-ray scattering (SAXS), high-precision density measurements, and vapor pressure lowering (VPL) yield information on the micellar state of the anionic surfactant ZAS (Zn(C16H33SO3)2) in isododecane. Strong evidence is found for a bimodal size distribution of the surfactant over some small aggregates (oligomers) at a concentration of 0.5-1.0 mmole/liter and larger inverted micelles. The latter display a narrow size distribution around the average aggregation number, 17, which is rather temperature and concentration independent. The inverted micelles can be described as network structures with a diffuse transition region of 5A˚between the polar core and apolar collar. The low electron density in the polar core is probably due to the presence of solvent molecules and/or apolar surfactant tails even in its center. Convincing evidence is found for an aspherical shape of the micellar core. Two geometrical forms are proposed, either an elongated cylinder (h = 32A˚, r = 8.5A˚) or a disklike particle (h = 10A˚, r = 15A˚).
E-info
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