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Proceedings Paper

Advances in liquid toner charging mechanism
Author(s): James R. Larson
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Paper Abstract

Particles dispersed in a hydrocarbon liquid become charged by the addition of a charge director, a hydrocarbon soluble ionic surfactant, which aggregates into inverse micelles in non-polar media. This effect is utilized in liquid electrostatic developers for imagewise particle deposition which enables electrostatic printing. The charge director micelles ionize to form both positive and negative micelles which can compete with particles of the same sign for image charge during the image development process. Several techniques are available for the measurement of particle charges. These include methods by which particles are electrophoretically developed and the transient current monitored, one method where micelle counter ions are stripped from the particles by fluid flow, and particle charge can be related to particle mobility which can be measured by a number of techniques. All of these methods have some utility but their effectiveness will depend on how well they account for all of the charged species in the particle dispersion and other factors which effect charge on the particle. In this report a discussion of the influence of micelle ionization and the affect applied field have on the charge of particles is presented and how these phenomena might impact the measurement of the particle charge.

Paper Details

Date Published: 18 June 1993
PDF: 8 pages
Proc. SPIE 1912, Color Hard Copy and Graphic Arts II, (18 June 1993); doi: 10.1117/12.146252
Show Author Affiliations
James R. Larson, Xerox Webster Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1912:
Color Hard Copy and Graphic Arts II
Jan Bares, Editor(s)

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