cam a22 2 4500 150954115 CHVBK 20140908095040.0 080510s1968 xxu 00 eng|d (OCoLC)227499813 (NEBIS)003419158 (OCoLC)227499813 DTICE SzZuIDS NEBIS ZBZ Gillespie Henderson C. Continuous-tone electrophotography Henderson C. Gillespie, Wendell M. Lee, and Gerald Lozier [Washington] [Maps and Publications, Dept. of State U.S.A.] 1968 46 S. Two approaches to the experimental investigation of the electric fields near a charged and imaged zinc oxide/binder layer were made, to elucidate the role of electrostatic induction of the field near a discontinuity between charged and discharged areas: (1) Steps to construct a 0.001-in. -diam. probe for exploring the electric field near a charged zinc oxide/binder layer were developed; and (2) micrographs of a layer charged uniformly and then discharged in a bar pattern by light have been made in a scanning electron microscope. Analysis of the micrographs indicates the results to be a function of the field near the surface, but this has not been confirmed. Basic mechanisms and forces occurring in liquid development of Electrofax were investigated, and a literature search was performed. Two mechanisms for charging particles are discussed: acid-base equilibrium and specific adsorption. The principal transport process for bringing particles to the deposition site is by electrophoretic focus. A dielectrophoretic transport mechanism can be a factor in divergent fields. The two principal forces holding particles on the Electrofax paper are electrostatic and/or van der Waals. The point in the deposition at which charge neutralization takes place, to date, has not been determined. The role of particle size on time deposition and the key factors in continuous-tone development are discussed. (Author) Photography scgdst Electrophotography dtict Photographic tone dtict Photographic recording media dtict Zinc compounds dtict Oxides dtict Binders dtict Electrostatic fields dtict Electromagnetic probes dtict Electron microscopy dtict Acid base equilibrium dtict Adsorption dtict Electrophoresis dtict Deposition dtict Lee Wendell M. Lozier Gerald MedeaZBZ SWK idszbz ZR NEBIS 100 1- Gillespie Henderson C. NEBIS 700 1- Lee Wendell M. NEBIS 700 1- Lozier Gerald BK020000 XK020000 XK020000 NEBIS Z01 Z04 KM05 Kart 4266 GB