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- W2077767682 abstract "Abstract The results of an experimental investigation of ion transport between aqueous solutions separated by thin single-crystal silver bromide membranes are reported. Two distinct types of experiments were performed: membrane-resistance experiments, which consisted of measuring the transmembrane electrical resistance under various test conditions using small amounts of transported charge; and membrane-transport experiments, which studied the effects of transporting large amounts of charge through membranes under various test conditions. The membrane-resistance experiments showed that large variations in the membrane resistance occur when test-solution silver ion concentration is varied. These resistance variations were enhanced in plastically deformed membranes, and reduced in membranes prepared from silver sulfide- or cadmium bromide-doped crystals. The membrane-transport experiments showed that the membrane resistance is also varied by charge transported through membranes in contact with test solutions of low silver ion concentrations. The electrode position of a small amount of additional silver bromide onto the surfaces of a membrane by a transport method increased the membrane resistance and reduced the membrane resistance variations with test solution silver ion concentration. A photomicrograph of such an electrodeposited membrane surface illustrates that epitaxial deposition occurs preferentially at specific sites. Using a transport method to cause electroerosion, perforation of the membranes occurred when less than 0.05% of the membrane mass had been removed. The results of these experiments are in qualitative agreement with a model which considers that the transmembrane current flow in undoped membranes occurs predominantly along channels. The channels are presumed to be the regions along crystal dislocations. It is concluded that the large membrane resistance variation with test solution silver ion concentration occurs as a result of variations in the contact resistance between the channels and the test solutions. These results also indicate that the room temperature bulk conductivity of undoped silver bromide crystals depends on the density of bulk crystal dislocations as well as the density of point defects." @default.
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- W2077767682 date "1972-09-01" @default.
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- W2077767682 title "The electrical conduction of pure and doped silver bromide membranes in aqueous solutions" @default.
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- W2077767682 doi "https://doi.org/10.1016/0021-9797(72)90347-5" @default.
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