钛金属低温生物活化

Low-temperature Approach to Induce Bioactivity on Titanium

利用含微量TaCl5的双氧水溶液在低于 10 0℃温度下与钛金属之间的化学反应 ,在钛金属表面直接生成具有良好生物活性的锐钛矿与金红石混合结构晶态二氧化钛薄膜。研究了双氧水浓度和处理温度的影响。结果表明 ,80℃下 ,双氧水浓度大于 6wt.%时即可在钛金属表面获得具有良好生物活性的晶态二氧化钛薄膜 ,进一步增加双氧水浓度直到 30wt.%对结果没有明显的影响。处理温度强烈影响钛金属表面的产物及其在模拟体液中诱导沉积羟基磷灰石的能力。

Crystalline titania films (anatase and rutile) with excellent in vitro bioactivity were deposited through interactions of titanium and hydrogen peroxide solutions containing trace tantalum chloride under temperatures lower than 100℃. Effects of both hydrogen peroxide concentrations and temperatures were studied in detail. Results reveal that a concentration of hydrogen peroxide as low as 6wt.% was enough to induce the low-temperature deposition of a mixture of anatase and rutile with excellent in vitro bioactivity on titanium surface. The increased concentration of hydrogen peroxide for up to 30wt.% had no significant effects. The ability of titanium to induce apatite deposition in SBF was readily affected by treating temperatures.