In situ Observation of Trace Amounts of Adsorbed species at Alloy Electrode/Solution Interface

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An apparatus for in situ observation of adsorbed species at alloy electrode/solution interfaces was developed in the present research. It permitted observation of drug adsorption on dental alloy electrodes. The obtained results are as follows.1. An apparatus for in situ observation of adsorbed species at alloy electrode The apparatus consists of equipments for voltammetry, specular reflection, in situ electrochemical quartz crystal microbalance (EQCM) etc. Eltctrochemical properties of various dental alloy electrodes in artificial saliva were obtained by voltammetry. Usefulness of the specular reflection and EQCM for studying adsorption of iodide ion on gold electrode was assessed.2. Adsorption and surface reaction of druge at alloy of precious metals Interactions between dental alloys of precious metals and oral germicidal drugs were examined using the apparatus. A very thin films, one or two monolayr, of AgI and CuI were formed on the alloy surfaces in artificial saliva containing compound iodine glycerin.3. Interaction between alloy of base metals and compound iodine glycerin. No surface layr was observed on dental alloy of base metal in arificial salive containing compound iodine glycerin. Elution of metal ions from Ni-Cr alloy was caused by iodine in compound iodine glycerin.The apparatus was shown useful for in situ observation of trace substances at alloy electrode/solution interfaces.