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

用X射线光电子能谱和俄歇电子能谱表征了钙离子注入钛在硝酸溶液（pH值为-0.99，0，1，2）和磷酸盐-柠檬酸缓冲液（pH值为5.2和7.2）中在310 K下10^3-5x10^6s的微溶解。结果，发现含钙的表面氧化物溶解在溶液中。表面氧化物中氧的溶解减少，钛的溶解增加。此外，羟基自由基的数量减少，Ti^<4+>在钛中的比例增加。随着溶解，来自Ti^<4+>的钙和钛的核能级结合能降低。这些变化是由于溶解过程中表面氧化物的变化引起的。也就是说，钙溶解，因此，表面氧化物变成氧化钛。表面改性层由三层组成，钙元素分布在改性层的整个深度。钙离子洗脱 ...更多信息 通过表面改性层本身的溶解和通过表面改性层的扩散溶解钙。13 EA 02：此外，为了比较钙离子（Ca^<2+>）注入钛与纯钛的表面性质，并探讨Ca^<2+>注入钛的骨传导机制，估计了Ca^2+注入钛和钛的羟基自由基的量。此外，确定了构成注入Ca^2+的钛和钛的表面氧化物的氧化物的零电荷点。结果表明，注入Ca ^2+的钛表面活性羟基自由基的数量明显大于纯钛表面，表明注入Ca^2+的钛在电解液中的带电位点比纯钛多。金红石型（TiO_2）、金红石型（TiO_2）和钙钛矿型（CaTiO_3）的pzc值分别为4.6，5.9和8.1。因此，注入Ca^2+的钛表面在生物液体中比钛带更多的正电荷，加速了磷酸根离子的吸附。少

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