Effect of EO Chain Length of Dodecanol Ethoxylates (C12En) on the Complexation of C12En/SDS Mixed Micelles with an Oppositely Charged Polyelectrolyte

Journal of Colloid and Interface Science
H ZhangT Kato

Abstract

Turbidimetry, dynamic light scattering, and capillary electrophoresis were used to study the complexation of polydiallyldimethylammonium chloride (PDADMAC) with mixed micelles of sodium dodecyl sulfate (SDS) and dodecanol ethoxylates (C12En). The effect of EO chain length and its distribution was examined using various combinations of C12En (n = 4, 6, 8, 12). The results show that the onset of the complexation of PDADMAC with the mixed micelles is affected by the EO chain length of C12En: the mole fraction (Y) of SDS in the mixed micelle required to form the complex (Yc) increases with n. The effect of EO chain length on the onset of bulk phase separation shows the same trend. Although Yc varies with n, the electrophoretic mobility of mixed micelles with composition corresponding to Yc is independent of n. We propose that the effect of EO chain length has two aspects: (1) an increase in the average distance between bound polycation segments and the SDS sulfate groups, and (2) an increase in the distance between SDS head groups, which causes a decrease in the surface charge density (sigma) of the micelle. Therefore, the electrical potential at the mean locus of bound polymer segments, psi0, decreases with increasing n; in order ...Continue Reading

Citations

Mar 26, 2015·The Journal of Physical Chemistry. B·Edit Fegyver, Róbert Mészáros
Oct 13, 2010·Physical Chemistry Chemical Physics : PCCP·John JaniakKarin Schillén
Dec 4, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Edit Fegyver, Róbert Mészáros
Dec 16, 2003·Advances in Colloid and Interface Science·David Voisin, Brian Vincent
Mar 30, 2011·The Journal of Physical Chemistry. B·Ebru KizilayPaul L Dubin
Aug 12, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Mario CampanaAli Zarbakhsh

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