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Proceedings Paper

Zeta-potentials and heats of adsorption of charge-control agents on liquid toners
Author(s): Frederick M. Fowkes; T. B. Lloyd; W.-J. Chen; G. W. Heebner
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Paper 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.

Paper Details

Date Published: 1 July 1990
PDF: 11 pages
Proc. SPIE 1253, Hard Copy and Printing Materials, Media, and Processes, (1 July 1990); doi: 10.1117/12.19840
Show Author Affiliations
Frederick M. Fowkes, Lehigh Univ. (United States)
T. B. Lloyd, Lehigh Univ. (United States)
W.-J. Chen, Lehigh Univ. (United States)
G. W. Heebner, Lehigh Univ. (United States)

Published in SPIE Proceedings Vol. 1253:
Hard Copy and Printing Materials, Media, and Processes
Joseph Gaynor, Editor(s)

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