OTS修饰活性钛表面及电化学沉积钙磷涂层的研究

通过Piranha溶液(体积比H2SO4:H2O2=7:3)处理在医用钛表面形成纳米网状结构的氧化层。利用自组装技术在材料表面接枝十八烷基三氯硅烷(OTS)膜,对OTS膜层进行紫外光照,探讨材料亲疏水表面对电化学沉积钙磷涂层的影响。通过傅里叶变换红外谱仪(FTIR)、接触角测定仪、X射线衍射仪(XRD)、场发射扫描电镜(FE-SEM)对OTS膜和钙磷涂层进行了表征和探讨。结果表明活性钛表面OTS的水接触角(109.8±2.1)°经UV辐照后降低到(63.4±1.8)°,其表面能由37.50 m J·m-2增加到45.18 m J·m-2。通过电化学方法使钙磷沉积在活性钛、不同的Ti-OTS亲疏水表面。研究结果表明经UV辐照120 min后的Ti-OTS表面钙磷涂层更均匀有序,有望能提高植入材料的稳定性。

Modification of Titanium Surface with Octadecyl-Trichlorosilane and Its Effects on Electrochemical Deposition of Calcium Phosphate

Titanium plates were grafted with octadecyl-trichlorosilane (OTS) after activated by piranha solution (H2SO4:H2O2=7:3 in volume ratio) and then the Ti-OTS was irradiated by UV light. The influence of UV irradiation on the calcium phosphate coating on different titanium samples obtained by electrochemical deposition was discussed. The OTS self-assembled monolayer and calcium phosphate coatings on titanium were characterized by fourier transform infrared spectroscopy (FTIR), contact angle tester, X-ray diffractometer (XRD) and field emission scanning electron microscopy (FE-SEM). The results show that the water contact angle of Ti-OTS is decreased from 109.8±2.1° to 63.4±1.8° after UV irradiation, and the surface free energy increases from 37.50 mJ·m--2 to 45.18 mJ·m--2. Highly homogeneous and ordered flower-like hydroxyapatite crystals are distributed on Ti-OTS-UV, which could be expected to improve the stability of the implant material