首页|UV-Enhanced Bioactivity of PS/TiO_2 Coating Prepared by Layer-by-Layer Self-Assembly Method
UV-Enhanced Bioactivity of PS/TiO_2 Coating Prepared by Layer-by-Layer Self-Assembly Method
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NETL
NSTL
Trans Tech Publications Ltd
The TiO_2 nanopowder was prepared with TiOSO_4 as raw material at low temperature by hydrolysis method, and microspheres coated polyethylene and TiO_2 were then fabricated on titanium by layer-by-layer self-assembly technology. Using ultraviolet irradiation of titanium coating in distilled water for some time, titanium with enhanced bioactivity was achieved when immersed in simulated body fluid (SBF). The morphology, size and crystal shape before and after ultraviolet irradiation were characterized by scanning electron microcopy (SEM) and X-ray diffraction (XRD). UV irradiation of titanium results in the conversion of Ti~(4+) to Ti~(3+) and the generation of oxygen vacancies, which could react with the absorbed water to form basic Ti-OH groups. Compared with the coating non-UV irradiation, the UV-irradiated coatings do not present any obvious differences in morphology, surface roughness, grain size and phase component; however, they have more abundant basic Ti-OH groups thus the water contact angle decreases greatly so the surface become much more hydrophilic.
PSUV irradiationhollow sphere TiO_2
Zhang Zhixian、Xiao Fan、Gao Fei
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Zhejiang University of Technology, Hangzhou 310014, China
NETL
NSTL
Trans Tech Publications Ltd
