Structure and dynamics of micelles and cubic phase structures with ethoxylated phytosterol surfactant in water
Artikel i vetenskaplig tidskrift, 2008

The self-assembly of a sterol ethoxylate surfactant with 30 oxyethylene units in water was studied by 1 H NMR self-diffusion measurements in a wide concentration range in the micellar region (0-25 wt %). The data showed that the surfactant aggregates do not interact by hard sphere interactions but rather a strong concentration dependence of the diffusion coefficient was noted which was explained by polymer scaling theory. In the cubic phase (30-65 wt %), the self-diffusion data from water, from surfactant, and from free polyoxyethylene suggest spherical micelles, although water diffusion was much restricted due to binding to the surfactant headgroup. From X-ray measurements in the cubic phase, the unit cell size was calculated, and together with surfactant self-diffusion measurements the exchange dynamics between free and aggregated surfactant was obtained. © 2008 American Chemical Society.

Författare

B. M. Folmer

Nestle S.A.

Magnus Nydén

SuMo Biomaterials

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Langmuir

0743-7463 (ISSN) 1520-5827 (eISSN)

Vol. 24 6441-6446

Ämneskategorier

Fysikalisk kemi

DOI

10.1021/la703758p