Elucidation of surface properties of calcium-ion-implanted titanium in biological systems

阐明生物系统中钙离子注入钛的表面特性

• 批准号: 07672114
• 负责人: HANAWA Takao
• 金额: $ 1.41万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07672114/
• 关键词: Titanium; calcium ion implantation; surface modification; ion dissolution; hydroxyl radical; bone conductivity; イオン注入; 表面特性

Microdissolution of calcium ions from calcium-ion-implanted titanium into nitric acid solutions (pH -0.99,0,1, and 2) and phosphate-citric acid buffers (pH 5.2 and 7.2) at 310 K for 10^3-5x10^6s was characterized using X-ray photoelectron spectroscopy and Auger electron spectroscopy. As a result, the surface oxides with calcium were found to dissolve in the solutions. Oxygen decreased and titanium increased in the surface oxide according to the dissolution. In addition, hydroxyl radicals decreased in number and the proportion of Ti^<4+> in titanium increased. Core-level binding energies of calcium, and titanium originating from Ti^<4+> decreased with the dissolution. These changes were caused by the transformation of surface oxide according to the dissolution. That is, calcium dissolved and, consequently, the surface oxide became titanium oxide. The surface-modified layr consisted of three layrs while calcium existed in whole depth of the surface-modified layr. The calcium ions eluted … More into both solutions by the dissolution of the surface-modified layr itself and the dissolution of calcium by the diffusion through the surface-modified layr.13EA02 : In addition, to compare the surface properties of calcium-ion (Ca^<2+>)-implanted titanium with those of titanium and to investigate the mechanism of bone conductivity of Ca^<2+>-implanted titanium, amounts of hydroxyl radical of Ca^<2+>-implanted titanium and titanium were estimated. Also, the point of zero charge of oxide constituting surface oxides of Ca^<2+>-implanted titanium and titanium were determined. Results showed that the amount of active hydroxyl radical on Ca^<2+>-implanted titanium was found to be significantly larger than that on titanium, indicating that the number of electric-charging sites of Ca^<2+>-implanted titanium in electrolyte is more than that of titanium. The pzc values of rutile (TiO_2), anatase (TiO_2), and perovskite (CaTiO_3), were estimated to be 4.6,5.9, and 8.1, respectively. Thus, Ca^<2+>-implanted titanium surface is charged more positively in bioliquid than titanium, accelerating the adsorption of phosphate ions. Less

用x射线光电子能谱和奥歇电子能谱研究了钙离子注入钛在310 K下，在10^3-5 × 10^6s的硝酸溶液（pH值为-0.99、0、1和2）和磷酸-柠檬酸缓冲液（pH值为5.2和7.2）中钙离子的微溶解。结果发现，带钙的表面氧化物溶解在溶液中。根据溶解情况，表面氧化物中氧含量降低，钛含量增加。羟基自由基数量减少，钛中Ti^<4+>的比例增加。来源于Ti^<4+>的钙和钛的核能级结合能随着溶解而降低。这些变化是由表面氧化物根据溶解而发生的转变引起的。也就是说，钙溶解后，表面的氧化物变成了氧化钛。表面改性层由三层组成，而钙存在于表面改性层的整个深度。钙离子通过表面修饰层本身的溶解和钙离子通过表面修饰层的扩散而溶解到两种溶液中。13EA02：此外，为了比较钙离子（Ca^<2+>）植入钛与钛的表面性质，探讨钙离子（Ca^<2+>）植入钛的骨导电性机制，我们估计了钙离子（Ca^<2+>）植入钛与钛的羟基自由基量。测定了Ca^<2+>注入钛和钛的表面氧化物的零电荷点。结果表明，Ca^<2+>-植入钛上的活性羟基自由基量明显大于钛上的活性羟基自由基量，表明Ca^<2+>-植入钛在电解质中的充电位点数量多于钛。金红石（TiO_2）、锐钛矿（TiO_2）和钙钛矿（CaTiO_3）的pzc值分别为4.6、5.9和8.1。因此，Ca^<2+>注入的钛表面在生物液体中比钛带更多正电荷，加速了磷酸盐离子的吸附。少