Abstract
The mechanism governing the generation of electrical charges on organic colorants dispersed in a metal soap solution is investigated. The system constitutes the basic ingredients of liquid developers used as color printing inks. The variation of surface charge density, σs, as a function of the metallic soap concentration in the apolar medium is determined from the electrophoretic mobility measurements. The experiments were conducted with different amounts of moisture in the non-conducting medium and physisorbed binder resins on the particle surface. A site-binding (SB) model is proposed which elucidates the surface complexation reactions occurring with the reactive groups at the particle–solvent interface. An equilibrium approach is adopted which focuses on the molecular description of the surface charge generation. The model results demonstrate good agreement with the measured σs. The equilibrium constants are determined from a non-linear, least-square curve-fit analysis.
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