钛表面二氧化钛纳米管/微米坑复合结构的制备及亲水性

Preparation and hydrophilicity of titanium dioxide nanotube arrays/micro-pits composite structure on titanium surface

为改善钛的生物相容性,促进成骨细胞在其表面的附着与分化,设计了一种新型工艺。通过微弧氧化后酸洗的技术在钛表面制备微米级凹坑(10~20μm)。通过阳极氧化技术在上述微米级凹坑上制备定向生长的二氧化钛纳米管(70~80 nm)。采用微弧氧化、酸洗和阳极氧化复合工艺,制备出二氧化钛纳米管/微米坑复合结构。研究了使用不同电解液制备的微弧氧化涂层所获得复合结构的形貌,分析了复合结构形貌对亲水性的影响。结果表明,采用Na2B4O7电解液制备的微弧氧化涂层所获得的复合结构具有显著的微纳米分级结构特征,并展现出优异的亲水性。

A novel process was proposed to improve the biocompatibility of titanium and promote the adhesion and differentiation of osteoblasts on its surface.Firstly,the micro-arc oxidation(MAO),followed by the acid-washing,was adopted to prepare micron-scale pits(10-20μm)on the surface of titanium,then the sample was anodized to prepare TiO2 nanotube arrays(70-80 nm)on the micron-scale pits described above.The composite structures using MAO treated samples prepared in different electrolytes were studied.The influence of the composite structure on the surface hydrophilicity was investigated.The results suggest that the sample surface,during the preparation of which Na2B4O7 was adopted as the MAO electrolyte,had a micro/nano hierarchical structure and showed excellent hydrophilicity.