Abstract
The hydrodynamic diameters and electrokinetic potentials of gold nanoparticles in n-decane, chloroform, and mixtures thereof have been studied as functions of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) concentration. At AOT concentrations in n-decane below 2 mM, gold nanoparticles are covered with AOT monolayer and do not reveal electrophoretic mobility. At a concentration of 0.3 M that, according to the data of photon-correlation spectroscopy, corresponds to the onset of adsorption of AOT micelles on the nanoparticle surface, the ζ-potential reaches a maximum value of 190 mV; then, it decreases with increasing surfactant concentration. A rise in the volume fraction of chloroform in decane-chloroform mixtures drastically increases the ζ-potential even at low AOT concentrations. The obtained results have been analyzed in terms of the Debye-Hückel theory.
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Original Russian Text © P.S. Popovetskiy, A.I. Bulavchenko, M.G. Demidova, T.Yu. Podlipskaya, 2015, published in Kolloidnyi Zhurnal, 2015, Vol. 77, No. 1, pp. 65–72.
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Popovetskiy, P.S., Bulavchenko, A.I., Demidova, M.G. et al. The size, charge, and electrokinetic potential of gold nanoparticles in solutions of sodium bis(2-ethylhexyl) sulfosuccinate in n-decane-chloroform mixtures. Colloid J 77, 58–64 (2015). https://doi.org/10.1134/S1061933X14060131
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DOI: https://doi.org/10.1134/S1061933X14060131