(1. 湖南大学 化学化工学院，长沙 410082；2. 湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 采用复合溶胶−凝胶法在单晶硅表面制备含钛磷灰石蜂窝状多孔涂层。采用热重−差热分析(TG−DSC)测定复合凝胶层转化为蜂窝多孔涂层的温度，采用SEM、ICP-AES、XRD与EDS等技术对涂层的微观形貌与成分进行分析；通过在pH值分别为7.0和7.4的模拟液(SBF)浸泡实验考察涂层的化学稳定性和对骨状磷灰石的诱导能力。结果表明：复合凝胶层转化为含钛磷灰石蜂窝多孔涂层的适宜温度为580~800 ℃，蜂窝状多孔涂层由含钛磷灰石构成，蜂窝孔径约为0.5~1.0 μm，涂层中贯穿有直径约100 nm、长数微米的氧化钛纳米线；蜂窝状多孔涂层在pH值为7.0的SBF中具有良好的化学稳定性，在pH值为7.4的SBF中能诱导骨状磷灰石的形核与生长，体现出优异的骨磷灰石诱导性能。
关键字: 复合溶胶−凝胶；磷灰石；氧化钛；蜂窝状多孔涂层；单晶硅
silicon by hybrid sol-gel method
（1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The titanium-containing apatite coating (TCAC) with honeycomb-like structure was fabricated on single crystal silicon by a hybrid sol-gel approach including preparation of hybrid sol containing calcium, phosphorous and titanium, immersion and spin of specimens in hybrid sol, desiccation of hybrid sol, and calcination of hybrid gel. TG−DSC curve was used to determine appropriate temperature for the conversion of hybrid gel into coating. SEM, ICP-AES, XRD and EDS were employed to characterize the morphologies and compositions of specimens. The chemical stability and inductive ability for bone-like apatite of TCAC were tested by soaking specimens in simulated body fluid (SBF) with pH values of 7.0 and 7.4, respectively. The results show that hybrid gel forms honeycomb-like coating, which composes of titanium-containing apatite, at calcination temperatures ranging from 580 ℃ to 800 ℃, the aperture of coating is 0.5−1.0 μm and titania nanowires with approximately diameter of 100 nm and the micro-metric length are embedded in as-obtained honeycomb-like TCAC. TCAC possesses good chemical stability and bone-like apatite inductive ability based on nucleation and growth of apatite crystals in SBF with pH value of 7.0 and 7.4, respectively.
Key words: hybrid sol-gel; apatite; titania; honeycomb-like coating; single crystal silicon
