Hydrothermal Synthesis of Bioinert TiO2-ZrO2 Films on Ti Substrates with Zr-dissolved Alkaline Solutions

Resources Processing Pub Date : 2012-01-01 DOI:10.4144/RPSJ.59.17

Ryuichi Kozakura, M. Ueda, M. Ikeda

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Abstract

Titanium and its alloys have been used in bone plates/screws; these are designed to be removed after recovery. However, bone can sometimes bond to surface of implanted materials that remain in the body for long periods of time. This can lead to re-fracture of newly repaired bone during operations to remove the implants. The purpose of the present study was to synthesize bioinert films, including ZrO2 on pure Ti surfaces and to investigate hydroxyapatite (HAp) formation on the synthesized films in simulated body fluid (SBF). Pure Ti disks were chemically treated with H2O2/ HNO3 aqueous solutions at 353 K for 20 min. The disks were hydrothermally treated with ZrOCl2/ NH3/C6H8O7 (citric acid) aqueous solutions at 453 K for 12 h. The specimens were immersed in SBF, which was maintained at 310 K. After being soaked for different periods of time, the surfaces were observed by SEM. In the hydrothermal treatment with ZrOCl2/NH3 aqueous solution, the surface product was anatase-type TiO2. On the other hand, when citric acid was added the surface of Ti was covered homogeneously with a TiO2-ZrO2 composite film. This surface suppressed the precipitation of HAp during SBF soaking.

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水热法合成钛基生物惰性TiO2-ZrO2膜

钛及其合金已用于骨板/螺钉;这些被设计为在恢复后取出。然而，骨有时可以与植入材料的表面结合，并在体内停留很长一段时间。在移除植入物的手术中，这可能导致新修复的骨再次骨折。本研究的目的是在纯钛表面合成生物惰性膜，包括ZrO2，并研究在模拟体液(SBF)中合成的膜上羟基磷灰石(HAp)的形成。采用H2O2/ HNO3水溶液在353 K下化学处理20 min, ZrOCl2/ NH3/C6H8O7(柠檬酸)水溶液在453 K下水热处理12 h，试样浸泡在310 K的SBF中。浸泡不同时间后，用扫描电镜对表面进行观察。在ZrOCl2/NH3水溶液的水热处理下，表面产物为锐钛矿型TiO2。另一方面，当添加柠檬酸时，Ti表面被TiO2-ZrO2复合膜均匀覆盖。该表面抑制了SBF浸泡过程中HAp的析出。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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