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. 20 wt.% 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 80 wt.% 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 vs. SDS).
Solution microstructures of the micellar phase of Pluronic L64/SDS/water system / Youssry, M.; Asaro, F.; Coppola, L.; Gentile, L.; Nicotera, Isabella. - In: JOURNAL OF COLLOID AND INTERFACE SCIENCE. - ISSN 0021-9797. - 342(2010), pp. 348-353.
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|Titolo:||Solution microstructures of the micellar phase of Pluronic L64/SDS/water system|
COPPOLA, Luigi (Corresponding)
|Data di pubblicazione:||2010|
|Citazione:||Solution microstructures of the micellar phase of Pluronic L64/SDS/water system / Youssry, M.; Asaro, F.; Coppola, L.; Gentile, L.; Nicotera, Isabella. - In: JOURNAL OF COLLOID AND INTERFACE SCIENCE. - ISSN 0021-9797. - 342(2010), pp. 348-353.|
|Appare nelle tipologie:||1.1 Articolo in rivista|