Zhang Lan
,
Gao Qin
,
Han Yong
材料科学技术（英文）
doi:10.1016/j.jmst.2016.01.008
Micro-porous TiO2 coatings co-doped with Zn2+ and Ag nanoparticles were fabricated on Ti by micro-arc oxidation (MAO) for 0.5, 1.5, 2 and 4?min, respectively. The evolutions of morphology and phase component of the coating as a function of processing time were investigated. The microstructure of the 2?min treated coating was further observed by transmission electron microscopy to explore the coating formation mechanism. The amounts of Ag and Zn released from the 2?min treated coating were measured and the antibacterial properties of the coatings against Staphylococcus aureus (S.?aureus) were also investigated. The obtained results showed that with prolonged MAO time, the contents of Ag and Zn on the coating surfaces increased. All the coatings were micro-porous with pore diameters of 1-4?μm; however, some pores were blocked by deposits on the 4?min treated coating. The 2?min treated coating was composed of amorphous TiO2, anatase, rutile, ZnO, Zn2TiO4 and homogenously distributed Ag nanoparticles. After immersion, Zn2+, Ag+, Ti2+ and Ca2+ were released from the coating and with the immersion time prolonged, the accumulated concentrations of these ions increased. After immersion for 36 weeks, the accumulated Zn2+ and Ag+ concentrations were 6.88 and 0.684?ppm, respectively, which are higher than the minimal inhibitory concentration but much lower than the cytotoxic concentration. Compared with polished Ti control, the coatings co-doped with Zn2+ and Ag nanoparticles significantly inhibited the adhesions of S.?aureus and reduced the amounts of planktonic bacteria in culture medium, indicating that the Zn and Ag co-doped TiO2 could be a bio-adaptable coating for long-lasting anti-microbial performance.
关键词:
Zn
,
Ag nanoparticle
,
Co-doped TiO2
,
Micro-arc oxidation
,
Bio-adaptable
Zhang Yanni
,
Han Yong
,
Zhang Lan
材料科学技术（英文）
doi:10.1016/j.jmst.2016.06.007
SrTiO3 nanotube films with good adhesion strengths to Ti substrates were fabricated by using a hybrid approach with a modified anodization and a hydrothermal treatment (HT). The effect of Sr2+ concentration in HT solutions on the morphologies and phase components of the nanotubes were investigated, the SrTiO3 nanotubes formation mechanism was explored, and the adhesion strengths, hydrophilicity and apatite-forming ability of the SrTiO3 nanotubes were also evaluated. The results demonstrated that with increasing the incorporation of Sr2+ into the nanotubes, no obvious changes of the lengths and outer diameters of the nanotubes were observed, but the wall thickness and the crystallinity of SrTiO3 in the nanotubes increased. The accumulation of Sr at the inner tube wall indicated that the reaction of Sr2+ with TiO2 mainly occurred in the vicinity of internal surfaces of the closely arranged nanotubes. The formation of the SrTiO3 nanotubes could be attributed to an in situ dissolution-recrystallization process. The SrTiO3 nanotubes exhibited good hydrophilicity and bioactivity, and the induced apatite preferred to nucleate on the nanotubes with higher crystallinity and Sr content, indicating a good bio-adaptability of the SrTiO3 nanotubes for orthopedic application.
关键词:
SrTiO3 nanotubes
,
Modified anodization
,
Hydrothermal treatment
,
Bio-adaptability
