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Chapter 17

Electrical Charges on Dispersions

The different origins of the electric charges on particles in aqueous media and in nonpolar media are described. The mathematical theory of the electric double layer is outlined. Instrumentation to determine zeta potentials is described. Electrophoresis in media of low conductivity requires special attention. The ratio of charge to mass can sometimes be determined in such systems by physically separating the charged particles from their countercharges.

Key Words: colloid vibration potential (CVP), contact potential, Debye length, electrical double layer, electroacoustics, electroosmosis, electrophoresis, electrophoretic mobility, electrosonic amplitude (ESA), Gouy-Chapman theory, inverse micelle, ionic strength, microelectrophoresis, Nernst potential, point of zero charge (PCZ), Poisson-Boltzmann equation, potential determining ion, preferential adsorption, Stern layer, streaming potential, Volta potential, zeta potential








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