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通过控制双氧水/浓硫酸混合氧化液的反应配比和反应温度,在医用纯钛表面得到具有不同纳米形貌的二氧化钛凝胶层。利用场发射扫描电镜(FE-SEM)、原子力显微镜(AFM)、X射线光电子能谱(XPS)和接触角测定仪对化学氧化处理后的钛表面特性进行了表征,并推导了不同纳米形貌凝胶层的构建机理。结果表明,双氧水/浓硫酸溶液处理是一个热力学控制的化学溶解与氧化的过程,随着浓硫酸含量的增加,溶液中C(H+)增大,凝胶层内TiO2的溶解速度大于溶液沉积出二氧化钛的速度,导致凝胶孔的深度增加最终形成三维网络结构;模拟体液中的矿化实验表明,化学氧化处理钛表面有利于钙磷盐的沉积。
By controlling the reaction ratio of hydrogen peroxide / concentrated sulfuric acid mixed solution and the reaction temperature, the titania gel layer with different nano topography was obtained on the surface of medical pure titanium. The surface properties of titanium after chemical oxidation were characterized by field emission scanning electron microscope (FE-SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurement. Gel layer construction mechanism. The results showed that the treatment of hydrogen peroxide / concentrated sulfuric acid solution was a thermodynamically controlled chemical dissolution and oxidation process. With the increase of the concentration of concentrated sulfuric acid, the C (H +) concentration in the solution increased and the dissolution rate of TiO2 in the gel layer was greater than that of the solution The velocity of titanium dioxide led to the increase of the depth of the gel pores, finally forming a three-dimensional network structure. The mineralization experiments in simulated body fluids showed that chemical oxidation of titanium surface favors the deposition of calcium and phosphorus salts.