论文期刊

Formation mechanism and cytocompatibility of nano-shaped calcium silicate hydrate/calcium titanium silicate/TiO2 composite coatings on titanium




作者: Lan Zhang, Xiaoyan Huang, Yong Han
发表/完成日期: 2016-09-23
期刊名称: Journal of Materials Chemistry B
期卷:
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论文简介
Bilayered (HT0.5h and HT1h) and triple-layered (HT2h, HT6h and HT24h) coatings were fabricated on Ti using a hybrid process of microarc oxidation (MAO) and hydrothermal treatment (HT). The bilayered coatings comprise an outer layer of nanofloc Ca(Si1.9Ti0.1)O5 and an inner layer of microporous TiO2. The triple-layered coatings comprise an outer layer of nanoleaf or nanoribbon Ca3Si6O15(H2O)7, a middle layer of nanograined Ca(Si1.9Ti0.1)O5 and an inner layer of microporous TiO2. Hydrothermal formation mechanism of the coatings was explored. The adhesion strength, hydrophilcity and cytocompatibility of selected coatings were investigated. During HT, Ca2+ incorporated in TiO2 layer migrates out and reacts with SiO32- as well as HTiO3−, resulting in the formation of Ca(Si1.9Ti0.1)O5. Ca3Si6O15(H2O)7 nanoleaves nucleate from Ca(Si1.9Ti0.1)O5 preformed on the TiO2 and grow in length and width to nanoribbons at expense of Ca2+ and SiO32- ions. The nanofloc (HT0.5h and HT1h), nanoleaf (HT2h) and nanoribbon (HT6h) coated surfaces display firm adhesion to substrates and super hydrophilicity. Compared with as-MAOed TiO2, HTed coatings including HT0.5h, HT1h and HT2h enhance the mitochondrial activity, adhesion and proliferation of osteoblasts, and HT2h appears far more effective in accelerating the differentiation of osteoblasts.