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

Abstract:

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