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Electrophoretic Behavior in Model Colloidal Systems

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The understanding of underlying physical principles governing colloidal behavior in low dielectric liquids is of fundamental interest. A model colloidal system, which consists of monodispersed, –CN terminated, silica particles in di-2-ethylhexylsulfosuccinate (AOT) and hydrocarbon fluids, was chosen to study electrophoresis of charged particles over a wide range of AOT concentrations and applied fields, up to 1.0 V/micron. These particles charge negatively in AOT/Isopar solutions. We use the electrophoretic light scattering technique to determine that particle mobilities increase with applied electric field and level off for fields larger than 0.5 V/micron, independently of AOT concentration for concentrations larger than 1 mM. At high electric fields, where the mobility is field independent, all the dispersions converge to a single value of the mobility. A physical model is proposed to explain the experimental results. The model parameters are correlated with those extracted from adsorption isotherms of AOT/silica particles. This method of characterization of the dispersions and their electrophoretic behavior provides a deep understanding of the parameters that control charging, and is most relevant for industrial applications such as liquid ink printing and electrophoretic display devices.

Document Type: Research Article

Publication date: January 1, 1998

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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