Solution microstructures of the micellar phase of Pluronic L64/SDS/water system

Journal of Colloid and Interface Science
M YoussryI Nicotera

Abstract

Here we report on a study dealing with a self-assembling ethylene oxide-propylene oxide-ethylene oxide triblock copolymer (Pluronic L64) and an anionic surfactant, sodium dodecyl sulfate (SDS), that in water at 25 degrees C form an interesting micellar region (L-phase). We have investigated the sequence of micelle structures in this L-phase across a wide interval of copolymer concentrations using phase diagram determination, steady shear, and NMR self-diffusion (pulsed gradient spin-echo, PGSE) experiments. In solutions which have been prepared at moderately low copolymer concentrations (ca. 20wt.% L64) we report on a transition from discrete micelles to bicontinuous aggregates on the addition of SDS. This change was mainly inferred from self-diffusion coefficient patterns (i.e., the variation of copolymers and surfactant diffusivity vs. SDS content). At midrange and at higher polymer concentrations (i.e., in the interval from 50 to 80wt.% L64) the L-phase occurred with a bicontinuous structure which was not modified by the progressive addition of SDS. Such a bicontinuous structure was identified by the comparison of self-diffusion coefficients of both cosolutes and the bulk viscosity (i.e., the behavior of zero-shear viscosity...Continue Reading

References

Feb 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Tadashi InoueHiroshi Watanabe
Jul 5, 2005·Expert Opinion on Investigational Drugs·V Y Alakhov, A V Kabanov
Mar 22, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Dharmista MistryColin Booth
Mar 22, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Anuj ShuklaHeinz Rehage
Feb 6, 2007·The Journal of Physical Chemistry. B·Maria StjerndahlFredric M Menger
Nov 19, 2008·Physical Chemistry Chemical Physics : PCCP·Mohamed YoussryIsabella Nicotera

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