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

研制了一种用于合金电极/溶液界面吸附物质的原位观察装置。它允许观察药物在牙科合金电极上的吸附。得到的结果如下：1。一种合金电极上吸附物质的原位观察装置，该装置由伏安法、镜面反射、原位电化学石英晶体微天平等设备组成。用伏安法测定了各种牙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的吸附中的作用。研究了药物在贵金属合金上的吸附和表面反应，探讨了贵金属合金与口腔杀菌药物的相互作用。在含有复合碘甘油的人工唾液中，合金表面形成了一层或两层极薄的AgI和CuI薄膜。贱金属合金与复合碘甘油的相互作用。在含复合碘甘油的人工牙液中，未观察到母材牙合金的表面层。复合碘甘油中的碘使镍铬合金中的金属离子洗脱。结果表明，该仪器可用于合金电极/溶液界面处痕量物质的原位观察。

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.