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Characterization of the surface electrokinetic properties of solid-liquid colloidal dispersions by electrophoretic topography

Shaw-Ji Shiau, University of Massachusetts Amherst


Electrophoretic Topography (ET) technique is developed to study the surface behaviors (single acid site, amphoteric and zwitterionic surface) and electrophoretic properties (mobility-pH profile and mobility-conductivity profile) of colloidal dispersions without the influence of specific ion adsorption and double layer compression. A graphical correlation of the electrophoretic mobility data is displayed by a three dimensional Electrophoretic Template and a two dimensional isomobility contour plot, Electrophoretic Fingerprint. A systematic analysis of the Electrophoretic Fingerprint provides information such as isoelectric line, maximum mobility, isomobility line density, mobility-pH profile and mobility-conductivity profiles. Three colloidal systems were examined in this work: (1) polystyrene latex with different surface functional groups which include amidine, carboxyl, sulfate, carboxy-sulfate mixed and carboxyl-amidine zwitterionic latexes; (2) titanium dioxide-ionic surfactant (SDS and CTAB) dispersion; and (3) Carbonaceous particulates which include GM coal powders, coal-derived liquid fines, oxidized carbon black and nonoxidized carbon black. For each colloidal system characteristic surface behaviour was shown with its characteristic Electrophoretic Template and Fingerprint. Mobility-pH profiles of the various colloidal systems were used extensively to explore the electrokinetic properties under different experimental conditions. The Electrophoretic Topography technique can be used successfully to interpret qualitatively the surface behavior of colloidal dispersions.

Subject Area

Systems design

Recommended Citation

Shiau, Shaw-Ji, "Characterization of the surface electrokinetic properties of solid-liquid colloidal dispersions by electrophoretic topography" (1989). Doctoral Dissertations Available from Proquest. AAI9011798.