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ZB 10 - Soft Condensed Matter (R. Holyst)

We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!

Publication

Size and Shape of Micelles Studied by Means of SANS, PCS, and FCS

Author(s): Gapinski, Jacek and Szymanski, Jedrzej and Wilk, Agnieszka and Kohlbrecher, Joachim and Patkowski, Adam and Holyst, Robert
Title: Size and Shape of Micelles Studied by Means of SANS, PCS, and FCS
Abstract: The hexaethylene glycol monododecyl ether (C(12)E(6)) micelles at up to 10\% have been studied in their isotropic phase degrees C) by means of small angle neutron scattering (SANS) and correlation spectroscopy (PCS). The SANS data obtained at low could be unequivocally interpreted as a result of from a suspension of compact globular micelles with the shape a triaxial ellipsoid or a short end-capped elliptical rod. Different have been applied to analyze the SANS data obtained at higher (i) elongated rod-like micelles with purely sterical (ii) compact globular micelles with a weak attractive and (iii) globular micelles influenced by the critical in the whole temperature range studied. The good quality of experimental data indicated model (i) as the best it for our data. diffusion coefficients obtained from the PCS measurements have been to the diffusion coefficients calculated for the rod-like of the SANS data analysis. A good agreement was using the solvent viscosity, in agreement with the theoretical for sterically interacting globular colloidal particles. the SANS results obtained at 24 degrees C were compared to the self-diffusion coefficients previously measured by means of correlation spectroscopy (FCS) at this temperature. The agreement obtained after scaling the data with solution viscosity the validity of the generalized Stokes-Einstein relation in interacting systems: the product of the colloidal particle coefficient and the macroscopic viscosity remains in a broad range of concentrations. It has been concluded that FCS technique in combination with simple viscosity measurements might serve as a tool for estimating the micellar size and shape.
Pages: 9304-9314
Journal: LANGMUIR
Volume: 26
ID: ISI:000278427600023
Year: 2010
DOI: 10.1021/la100181d