Colloidal Stability of Polymer Colloids with Different Interfacial Properties: Mechanisms

Journal of Colloid and Interface Science
J. L. Ortega-VinuesaR Hidalgo-Álvarez

Abstract

An investigation is presented into the effects of interfacial properties on the colloidal stability of monodisperse polymer colloids using a sulfonate polystyrene (PS) and a styrene-hydroxyethyl methacrylate copolymer (PSHEMA) latex. Both latexes were prepared by emulsion copolymerization in the absence of surfactant. The experimental stability of these colloidal dispersions was studied in relation to the concentration (Ce) of an indifferent electrolyte. Results are compared to current models, relating the stability ratio (W) to intermolecular forces between particles. The Hamaker constant (A) obtained from the log W-log Ce plots and using the DLVO theory is much lower than the theoretical value given by the Lifshitz theory. To achieve good agreement between the experimental and theoretical A values, different corrections to the DLVO theory were introduced. First, the modified stability factor (W) was numerically estimated taking into account the hydrodynamic effect as given by L. A. Spielman [J. Colloid Interface Sci. 33, 562 (1970)]. Next, the real size of the hydrated ions was also considered. With these modifications only, small discrepancies remained between the theoretical and experimental values of the Hamaker constant i...Continue Reading

Citations

Mar 9, 2010·Journal of Colloid and Interface Science·Jan S VesaratchanonNorbert Willenbacher
Nov 8, 2015·International Journal of Biological Macromolecules·Jackson D MegiattoElisabete Frollini
May 13, 2015·Bioscience, Biotechnology, and Biochemistry·Yayoi MiyagawaShuji Adachi
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Sep 6, 2013·Chemical Reviews·Jose RamosRoque Hidalgo-Alvarez
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