DIFFUSION MEASUREMENTS IN MICROEMULSIONS

Autor:	R. Agarwal, N. S. Dixit, Reginald P. Seiders, R. A. Mackay
Rok vydání:	1983
Předmět:	Polarography Aqueous solution Polymers and Plastics Chemistry Diffusion Inorganic chemistry Analytical chemistry Micelle Surfaces Coatings and Films Colloid Yield (chemistry) Microemulsion Physical and Theoretical Chemistry Solubility
Zdroj:	Journal of Dispersion Science and Technology. 4:397-407
ISSN:	1532-2351 0193-2691
DOI:	10.1080/01932698308943379
Popis:	We have carried out diffusion coefficient measurements in both aqueous micelles and microemulsions using the techniques of palaeography and quasielastic light scattering (QLS) The former method involves the determination of the diffusion coefficient of an electroactive oil soluble probe at a polarizable microelectrode. For high water content microemulsions, both methods yield the same diffusion coefficients, which can be identified as the self diffusion coefficient For cetyltrimethylammonium bromide (CTAB) micelles, both methods yield the same result at the salt (NaBr) concentration at which the QLS measurements are independent of CTAB concentration. In more concentrated microemulsions, QLS data gave diffusion coefficients in agreement with polarography only for a sodium cetyl sulfate (SCS) system at 65-75 wt % water. For the SCS microemulsions at 60% water, and CTAB microemulsion at 60-75% water, the QLS data yielded rapid, nonexponential decays. However, consistent polarographic diffusion coeff...
Databáze:	OpenAIRE
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