Sato, T. and Fukasawa, T. and Arimaki, K. and Glatter, Otto and Buchner, Richard (2011) Molecular to diffusion dynamics and static structures of aqueous micellar solutions: A SAXS/DLS/DRS study. Journal of Molecular Liquids 159 (1), pp. 76-82.
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In this paper, we highlight the relevance of our renovated method for investigating mol. to diffusion dynamics and static structures of aq. micellar solns., in which we combine small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) with dielec. relaxation spectroscopy (DRS). Our unique SAXS/DLS/DRS approach, applied to aq. solns. of non-ionic amphiphile, poly(oxyethylene) cholesteryl ether, clarifies how hydrated water mols., which exhibit ca. 3-4 times slower collective reorientational dynamics than bulk water, contribute to the packing fraction, or the effective vol. fraction of the non-ionic micelles. The results demonstrate that the excluded vol. of the micelles involving the hydrated water mols. dets. the osmotic compressibility of the uncharged systems manifested in the extrapolated structure factor to zero scattering vector, S(q → 0). The data further prove that the concn. dependence of the collective diffusion const. measured by DLS can fully be explained only when the excluded vol. of the hydrated water mols. is properly accounted for.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||micellar soln mol diffusion dynamics structure SAXS DLS DRS|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||06 Jun 2012 13:53|
|Last Modified:||06 Jun 2012 13:53|