【摘要】 采用两步水热处理的方法对钽进行表面改性,在其表面获得具有较小棒间距的掺镁氧化钽纳米棒阵列。通过改变镁元素的掺杂量,观察纳米棒形貌及微观结构的变化。在水热过程中,最佳的乙酸镁溶液浓度为0.05 mol/L,Mg在氧化钽纳米棒膜层中的含量达到4.25at%,以Mg²⁺形式掺杂入Ta₂O₅纳米棒。使用AFM测量Ta、Ta₂O₅纳米棒和Mg-Ta₂O₅纳米棒样品的粗糙度,发现相比于纯钽片,Ta₂O₅纳米棒涂层和Mg-Ta₂O₅纳米棒涂层的粗糙度有所增加。ICP结果表明,生理盐水中镁离子的析出速率呈现先大幅度增加后变缓的趋势。在体外生物活性测试中,Ta₂O₅纳米棒涂层直到12 d后依然不能诱导出磷灰石;而Mg-Ta₂O₅纳米棒涂层表面不到8 d已经出现沉积磷灰石,Mg-Ta₂O₅纳米棒涂层有效地改善了钽基体表面的生物活性。更多还原

【Abstract】 Tantalum was modified by two-step hydrothermal treatment,and magnesium-doped tantalum oxide nanorods with narrow rod spacing were obtained on the surface of tantalum.The morphology and microstructure of nanorods were observed with the change of the doping amount of magnesium.In the process of hydrothermal treatment,the best concentration of magnesium acetate solution is 0.05 mol/L,and the content of Mg in tantalum oxide nanorods reaches 4.25 at%,and magnesium is doped in the form of Mg²⁺.The roughness was measured by AFM and the roughness of Ta₂ O₅ nanorods and Mg-Ta₂ O₅ nanorods is higher than that of pure tantalum.ICP results show that the precipitation rate of magnesium ions in normal saline increases greatly at first and then slows down.Ta₂ O₅ nanorod could not induce apatite until 12 d while apatite deposits on the surface of Mg-Ta₂ O₅ nanorod coating for less than 8 d in biological activity test.Mg-Ta₂ O₅ nanorod coating effectively improves the biological activity of tantalum substrate.更多还原