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

研制了一种在线观察合金电极/溶液界面吸附物种的装置。可以观察到药物在牙科合金电极上的吸附。得到的结果如下：1.研究结果。由伏安法、镜面反射法、原位电化学石英晶体微天平等设备组成，用伏安法测定了不同牙科合金电极在人工唾液中的电化学性能。评价了镜面反射和EQCM在研究碘离子在金电极上吸附的有效性。用该装置研究了药物在贵金属合金上的吸附和表面反应，以及贵金属合金与口腔杀菌药物的相互作用。在含复合碘甘油的人工唾液中，合金表面形成了一层或两层单层AgI和CuI薄膜。贱金属合金与复合碘甘油的相互作用。含复合碘甘油的牙科贱金属合金表面未见剥落现象。镍铬合金中金属离子的淋洗是由复合碘甘油中的碘引起的，该仪器可用于在线观察合金电极/溶液界面的痕量物质。

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.