Zeta-potentials and heats of adsorption of charge-control agents on liquid toners

Frederick M. Fowkes; T. B. Lloyd; W.-J. Chen; G. W. Heebner

doi:10.1117/12.19840

1 July 1990 Zeta-potentials and heats of adsorption of charge-control agents on liquid toners

Frederick M. Fowkes, T. B. Lloyd, W.-J. Chen, G. W. Heebner

Proceedings Volume 1253, Hard Copy and Printing Materials, Media, and Processes; (1990) https://doi.org/10.1117/12.19840
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

The electrostatic charging of non-aqueous dispersions involves the interaction of basic dispersants or basic charge-control agents with the acidic surface sites of the particles to provide negative charges, or the interaction of acidic dispersants or acidic charge-control agents with the basic surface sites of the particles to provide positive charges . The mechanism has three steps : 1) , adsorption of the dispersant or charge-control molecules by acid-base interaction with the surface sites; 2), proton-transfer or electron-transfer between some of the adsorbed species and surface sites; and 3), desorption of some charge-carrying adsorbed dispersant or charge-control molecules due to a dynamic adsorption-desorption process. In these studies the importance of the last step is illustrated with comparisons of zeta-potentials and heats of adsorption determined with various pigments interacting with several charge-control agents. It is found that although acid-base interactions are necessary for electrostatic charging, stronger acid-base interactions result in lower zeta-potentials, probably because of less desorption in the last step. Additives used to enhance charging of acidic particles are believed to be effective by diminishing surface acidity, so as to weaken the adsorption of charge-control agents, and favor their easier desorption in the last step of the charging process.

Citation Download Citation

Frederick M. Fowkes, T. B. Lloyd, W.-J. Chen, and G. W. Heebner "Zeta-potentials and heats of adsorption of charge-control agents on liquid toners", Proc. SPIE 1253, Hard Copy and Printing Materials, Media, and Processes, (1 July 1990); https://doi.org/10.1117/12.19840

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