聚多巴胺对氧化处理后钛合金表面沉积羟基磷灰石的影响

Influence of Polydopamine Coating on Deposition of Hydroxyapaite on Oxidated Titanium Alloy

利用阳极氧化法和微弧氧化法分别对医用钛合金表面进行处理,再经聚多巴胺薄膜表面修饰后,利用仿生溶液矿化法制备羟基磷灰石生物活性涂层,并研究聚多巴胺对经不同氧化处理的医用钛合金生物诱导沉积能力的影响;采用场发射扫描电子显微镜、X射线光电子能谱仪和X射线衍射仪对经不同氧化处理及其生物诱导沉积羟基磷灰石涂层的表面形貌、元素组成和相结构进行表征分析.结果表明:阳极氧化和微弧氧化处理后的钛合金表面分别形成了纳米管和微米孔结构;再经聚多巴胺修饰后,可以显著提高羟基磷灰石涂层的生物诱导沉积能力,而且使得羟基磷灰石的排列致密、规则.

This work concentrates on the influence of polydopamine （PDA） coating on the bio-induced dep- osition of hydroxyapaite （HA） on the surface of medical titanium （Ti） alloy pre-treated by anodic oxidation （AO） and microarc oxidation （MAO）. Ti alloy was firstly treated by AO and MAO, respectively, and then modified with PDA coating~ after that, all samples were immersed into the simulated body fluid （SBF） for depositing HA bioactive coatings. The morphologies, elemental compositions and microstruc- tures were characterized by field-emission scanning electron microscopy, X ray photoelectron spectrosco- py, X-ray powder diffraction. Upon AO and MAO treatments, nanotubes and micro holes are formed on Ti alloy, respectively. After being further modified by PDA, the deposition ability of HA on Ti alloy is significantly improved, and the arrangement of HA is relatively compact and ordered.