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- W2029884054 abstract "Abstract An electrical transient technique is described which enables the measurement of a number of parameters of charged insulating particles suspended in highly insulating liquids. The measured quantities include the electrophoretic mobility, particle charge, interparticle adhesive forces, and size of the migrating particles. A similar system could probably be used for the study of free ion motion in particle-free insulating liquids, although in the present case free-ionic effects are shown to be negligible. The technique has been used to study the behavior of model suspensions (similar to those used in photoactive pigment electrophotographic (PAPE) imaging technologies) exposed to very high fields; a particular interest is the size and origin of the high charge acquired by the thermoplastic particles during their exposure to fields approaching 108 V m−1, as used in PAPE. This charge, which is a critical determinant of the photographic sensitivity and range of PAPE systems, increases with the magnitude and application time of the charging field, and under typical PAPE conditions is a substantial fraction of the maximum possible (field collapse) charge. It is shown that the source of this charge is carrier injection at the metal electrodes, followed by capture by the particles of the ions so formed. The effect on this process of certain active impurities in the liquid is reported. The adhesive forces between typical ∼2 μm individual particles (which are associated into ∼10–20 μm aggregates) is estimated to be 10−10 to 10−9 N. It is shown that the aggregates dissociate under the field and migrate individually; they thus do not affect the ultimate photographic resolution of PAPE. The basic physics of the transport of insulating particles in insulating liquids under high fields has been studied, but a detailed discussion (including a unique form of spacecharge-limited motion) is deferred until the following paper." @default.
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- W2029884054 date "1980-07-01" @default.
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- W2029884054 title "High-field electrophoresis of insulating particles in insulating liquids. I. An electrical transient technique for studying particle mobility, charge, degree of aggregation, adhesive forces, and high-field charging mechanisms" @default.
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- W2029884054 doi "https://doi.org/10.1016/0021-9797(80)90273-8" @default.
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