【摘要】 采用阳极氧化法在纯钽表面制备了一层均匀的氧化钽纳米管层。研究了热处理对纳米管结构及其在模拟体液中诱导磷灰石能力的影响。阳极氧化后纳米管由非晶的氧化钽构成,在模拟体液中浸泡33 d后其表面可诱导出磷灰石颗粒,表现出较差的磷灰石诱导能力;750℃下对纳米管进行热处理后,纳米管的微观形貌未发生明显变化,但其物相转变为–Ta2O5,在模拟体液中浸泡15 d后可在其表面诱导出磷灰石颗粒,表现出较强的磷灰石诱导能力。分析原因:热处理后,纳米管表面Ta-OH基团的含量以及与羟基磷灰石的晶格匹配度的增加促进了纳米管表面磷灰石的形核。更多还原

【Abstract】 Tantalum oxide nanotube layer was prepared by anodic oxidation of commercial pure Ta. The effect of annealing treatment on the microstructure and bioactivity of the nanotube layer was investigated. The as-anodized nanotube layer consists of amorphous tantalum oxide. Apatite crystals are deposited on its surface after immersion in simulated body fluids(SBF) for 33 d, exhibiting weak apatite-inducing ability. After annealing at 750 °C for 12 h, the nanotube layer is composed of ?-Ta2O5, and its apatite-forming ability is significantly enhanced because of abundant basic Ta-OH group and the enhanced lattice structure matching. Apatite can be induced after immersion in SBF for 15 d.更多还原