Abstract
The solvatochromic acid-base indicator 2,6-diphenyl-4-(2,4-6-triphenyl-1-pyridinio)phenooxide, E T(30), is employed to determine the effective surface potentials of micelles (Ψ expt0 ) in relatively concentrated aqueous dodecyltrimethylammonium chloride (DTAC) systems (i.e. up to 40 wt% DTAC). Ψ expt0 decreases with increasing DTAC concentration, This is attributed to a concomitant increase in the amount of dissociated chloride ions in solution when the DTAC micellar concentration is increased. The effective surface potentials are compared with the electrostatic surface potentials obtained in relatively dilute micellar DTAC/NaCl systems and with the electrostatic surface potentials calculated from the non-linearized Poisson-Boltzmann (P-B) equation and a cell model (Ψ cell0 ). The P-B cell model, which incorporates a Langmuir adsorption constant in order to categorize the association of Cl− to the surfactant headgroups, adequately describes Ψ expt0 up to 7 wt% DTAC. Beyond 7 wt% Ψ expt0 and Ψ cell0 progressively diverge. The divergence is primarily considered to be a result of the fact that the P-B cell model neglects the ion-ion correlations and the finite size of the ions.
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© 1992 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Drummond, C.J., Murray, B.S. (1992). Surface potentials in concentrated isotropic micellar cystems. In: Sjöblom, J., Lindman, B., Stenius, P. (eds) Advances in Colloid Structures. Progress in Colloid & Polymer Science, vol 88. Steinkopff. https://doi.org/10.1007/BFb0114413
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DOI: https://doi.org/10.1007/BFb0114413
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