Hydroxyapatite coatings were directly prepared on anodized titanium by electro-deposition method in a modified simulated body fluid.The configuration,structure and bioactivity of the coating were investigated with sca...Hydroxyapatite coatings were directly prepared on anodized titanium by electro-deposition method in a modified simulated body fluid.The configuration,structure and bioactivity of the coating were investigated with scanning electron microscopy(SEM),X-ray diffraction analyzer(XRD)and Fourier transform infrared spectros-copy(FTIR)techniques.The results demonstrated that pure and homogeneous hydroxyapatite coating can be obtained without any post-treatment.The prepared coating showed good bioactivity in simulated body fluid(SBF).The time required for a fully covered dense hydroxyapatite coatings was 4 days immersion in SBF.展开更多
The in-vitro biological behavior of a newly-developed iron-containing hydroxyapatite/titanium（HA/Ti） composite was investigated by immersing the composites in the simulated body fluid（SBF） for up to 5 weeks.The ad...The in-vitro biological behavior of a newly-developed iron-containing hydroxyapatite/titanium（HA/Ti） composite was investigated by immersing the composites in the simulated body fluid（SBF） for up to 5 weeks.The addition of iron was observed to have a significant influence on the in-vitro biological behavior of the composites.The obtained results revealed that the stability of the composites in the physiological solution was markedly improved.The solubility decreased in the order of pure HA,HA/5（Ti-33Fe）,and HA/15（Ti33Fe）.Precipitation occurred on the surface of HA/5（Ti-33Fe） composite,showing a good combination of physiostability with bioactivity,while HA/15（Ti-33Fe） composite exhibited superior physiostability since there was no obvious change on the surface of HA/15（Ti-33Fe）.展开更多
Chemical compositions and mierosturcture of mature human tooth enamel were investigated by XRD , FTIR and SEM to further understand the characteristics of tooth enamel. In order to obtain apatite crystals chemically...Chemical compositions and mierosturcture of mature human tooth enamel were investigated by XRD , FTIR and SEM to further understand the characteristics of tooth enamel. In order to obtain apatite crystals chemically and structurally similar to those in tooth enamel, biomimetic way was employed. Self-assembled monolyers terminated with-SO3 H groups were used as deposition substrates and 1.5 SBF （ the concentrations of Ca^2＋ and PO4^3- ions 1.5 times ttum those in simulated body fluid ） with and without 5 ppm F^- were used as soaking medium. The XRD and FTIR results showed that both the deposited fluoride-substituted hydroxyapatite （ F-HAp ） crystals in 1.5 SBF with F^- and hydroxyapatite （ HAp ） crystals in 1.5 SBF were carbonate-contain ing, mimicking human tooth enamel in chemical compositions. The SEM photos showed that needle-like F-HAp crystals had large aspect ratios and grew in bundles, which were similar to the crystals in human tooth enomel. The results provide available information on dental restoration.展开更多
采用三种不同的预处理工艺对NiTi合金基体进行活化处理,利用柠檬酸作为缓冲剂配制高浓度模拟体液(Simulated body fluid,SBF)5×SBF1和5×SBF2,通过仿生合成在预处理后的NiTi合金基体上快速形成了钙磷涂层。对钙磷涂层的显微结...采用三种不同的预处理工艺对NiTi合金基体进行活化处理,利用柠檬酸作为缓冲剂配制高浓度模拟体液(Simulated body fluid,SBF)5×SBF1和5×SBF2,通过仿生合成在预处理后的NiTi合金基体上快速形成了钙磷涂层。对钙磷涂层的显微结构、组成和形貌进行了研究,结果表明:涂层呈多孔网状,由直径小于3μm的球形颗粒堆积而成,X射线衍射(XRD)测试显示其主要成分为羟基磷灰石;而缺少晶体生长抑制剂Mg2+和HCO3-的5×SBF高浓度模拟体液则明显地加快了羟基磷灰石涂层的形成。展开更多
基金Supported by the Young Scholars Fund of Beijing University of Chemical Technology(QN0713)
文摘Hydroxyapatite coatings were directly prepared on anodized titanium by electro-deposition method in a modified simulated body fluid.The configuration,structure and bioactivity of the coating were investigated with scanning electron microscopy(SEM),X-ray diffraction analyzer(XRD)and Fourier transform infrared spectros-copy(FTIR)techniques.The results demonstrated that pure and homogeneous hydroxyapatite coating can be obtained without any post-treatment.The prepared coating showed good bioactivity in simulated body fluid(SBF).The time required for a fully covered dense hydroxyapatite coatings was 4 days immersion in SBF.
基金supported by the Fundamental Research Funds for the Central Universities (N090602001)the Natural Sciences and Engineering Research Council of Canada (NSERC)
文摘The in-vitro biological behavior of a newly-developed iron-containing hydroxyapatite/titanium（HA/Ti） composite was investigated by immersing the composites in the simulated body fluid（SBF） for up to 5 weeks.The addition of iron was observed to have a significant influence on the in-vitro biological behavior of the composites.The obtained results revealed that the stability of the composites in the physiological solution was markedly improved.The solubility decreased in the order of pure HA,HA/5（Ti-33Fe）,and HA/15（Ti33Fe）.Precipitation occurred on the surface of HA/5（Ti-33Fe） composite,showing a good combination of physiostability with bioactivity,while HA/15（Ti-33Fe） composite exhibited superior physiostability since there was no obvious change on the surface of HA/15（Ti-33Fe）.
文摘Chemical compositions and mierosturcture of mature human tooth enamel were investigated by XRD , FTIR and SEM to further understand the characteristics of tooth enamel. In order to obtain apatite crystals chemically and structurally similar to those in tooth enamel, biomimetic way was employed. Self-assembled monolyers terminated with-SO3 H groups were used as deposition substrates and 1.5 SBF （ the concentrations of Ca^2＋ and PO4^3- ions 1.5 times ttum those in simulated body fluid ） with and without 5 ppm F^- were used as soaking medium. The XRD and FTIR results showed that both the deposited fluoride-substituted hydroxyapatite （ F-HAp ） crystals in 1.5 SBF with F^- and hydroxyapatite （ HAp ） crystals in 1.5 SBF were carbonate-contain ing, mimicking human tooth enamel in chemical compositions. The SEM photos showed that needle-like F-HAp crystals had large aspect ratios and grew in bundles, which were similar to the crystals in human tooth enomel. The results provide available information on dental restoration.
文摘采用三种不同的预处理工艺对NiTi合金基体进行活化处理,利用柠檬酸作为缓冲剂配制高浓度模拟体液(Simulated body fluid,SBF)5×SBF1和5×SBF2,通过仿生合成在预处理后的NiTi合金基体上快速形成了钙磷涂层。对钙磷涂层的显微结构、组成和形貌进行了研究,结果表明:涂层呈多孔网状,由直径小于3μm的球形颗粒堆积而成,X射线衍射(XRD)测试显示其主要成分为羟基磷灰石;而缺少晶体生长抑制剂Mg2+和HCO3-的5×SBF高浓度模拟体液则明显地加快了羟基磷灰石涂层的形成。
