热极化后生物玻璃-电极界面的研究
Investigation of Bioglass-Electrode Interfaces after Thermal Poling
摘要：
通过热刺激去极化电流测量、交流阻抗谱和SEM/EDX分析，研究了生物活性钠钙磷硅酸盐玻璃和生物可吸收钠钙磷酸盐玻璃在热极化过程中的电学和电化学过程。通过在玻璃样品的表面上溅射薄Pt电极膜并在高达513 K的温度下向电极施加高达1 kV的电压来进行热极化。极化导致电极下的界面层的形成，这是负责两个去极化电流峰和一个额外的交流阻抗的奈奎斯特图中的周期。SEM/EDX的配置文件表明，Na+离子的氧化还原和运输过程是负责的界面层的形成和Ca 2+离子是不动的极化条件下。阳极下的钠耗尽层导致玻璃样品的负表面电荷，这可以增强其生物活性。
英文摘要：
Electrical and electrochemical processes in a bioactive soda-lime phosphosilicate glasses and in a bioabsorbable soda-lime phosphate glass during thermal poling were studied by means of thermally stimulated depolarization current measurements, ac impedance spectroscopy, and SEM/EDX analyses. The thermal poling was done by sputtering thin Pt electrode films onto the faces of the glass samples and by applying voltages up to 1 kV to the electrodes at temperatures up to 513 K. The poling leads to the formation of interfacial layers under the electrodes which are responsible for two depolarization current peaks and for one additional semicircle in a Nyquist plot of the ac impedance. The SEM/EDX profiles suggest that redox and transport processes of Na+ ions are responsible for the formation of the interfacial layers and that Ca2+ ions are immobile under the poling conditions. The sodium depletion layer under the anode leads to a negative surface charge of the glass samples which may enhance their bioactivity.
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