CaP/壳聚糖复合膜层的电化学共沉积研究

用电化学共沉积方法在医用钛合金表面成功制备了CaP/壳聚糖复合膜层,并用XRD,SEM,FTIR漫反射光谱和XPS等对复合膜层化学组成及结构进行表征.结果表明,加入壳聚糖可使钙磷沉积层结构发生显著变化,将壳聚糖掺入钙磷沉积层,形成CaP/壳聚糖复合物和杂化物.力学实验表明,在钛基底表面未进行表面预处理条件下,CaP/壳聚糖复合膜层与钛基底的结合力高达2.6MPa,比单一CaP电化学沉积层与基底的结合力提高约4倍.文中还对壳聚糖参与表面电沉积反应机理进行了讨论.

Preparation and Characterization for a Co-deposited Hybrid Coating of Calcium Phosphate/Chitosan on Ti Alloy Surface

In this work, a novel electrodeposition has been developed to prepare a hybrid coating of calcium phosphate/chitosan on the surface of Ti alloy. The surface morphologies, chemical compositions and crystalline structures of the hybrid coatings are characterized by using various spectroscopic techniques, such as SEM, XPS, FTIR and XRD etc.. The results indicate that a hybrid coating of calcium phosphate/chitosan is formed on the metal surface when adding minor of chitosan to the electrolyte of calcium phosphate under the electrodeposition condition. The morphology of the hybrid coating is significantly different with that of the pure calcium phosphate. It is also shown that the bonding strength of the hybrid coating to the metal substrate has been increased as high as 2.6 MPa because of the incorporation of chitosan in the coating. Meanwhile, the chitosan is a natural polymer compound with good biological-properties, it is proposed to be of a high biocompatibility and an excellent biocompatibility when forming a hybrid coating of calcium phosphate/chitosan on a metal substrate. It means that the electrodeposited hybrid coating of calcium phosphate/chitosan developed in our lab may become a new promising implant biological material.