Three-dimensional(3D)printed titanium alloy implants hold enormous potential in orthopedic applications to avoid stress shielding.However,titanium alloy is bioinert,limiting its application and making surface modifica...Three-dimensional(3D)printed titanium alloy implants hold enormous potential in orthopedic applications to avoid stress shielding.However,titanium alloy is bioinert,limiting its application and making surface modification a necessity.In this paper,porous implants were treated by acid etching and anodizing to improve the bioactivity,which was evaluated by simulated body fluid(SBF)immersion test.The results showed that,after surface modification,micro-nanocomposite structures were obtained on the titanium surface,and after immersing in SBF for 2 weeks,the implants showed a drastically enhanced apatite forming ability,confirming improved bioactivity.However,the surface structures were different at different positions and it is believed that this phenomenon is closely related to the different current densities of the surfaces during anodic oxidation.Our research evaluates the effect of anodic oxidation at different voltages on the surface modification and provides a reference for improving the bioactivity of the medical porous implant surface prepared by 3 D printing.展开更多
Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering.In current...Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering.In current work,GO-TiO_(2)/(Ca,Y)F_(2):Tm,Yb,a full-spectrum composite photocatalyst,was prepared via hydrothermal processing with TiO_(2)/(Ca,Y)F_(2):Tm,Yb particles deposited on the surface of graphene oxide(GO).The surface properties of GO-TiO_(2)/(Ca,Y)F_(2):Tm,Yb were characterized using various characterization techniques including X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and Brunauer–Emmett–Teller(BET)surface area analyzer.Besides,ultraviolet–visible(UV–Vis)diffuse reflectance spectroscopy,electron spin resonance(ESR)and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO_(2)/(Ca,Y)F_(2):Tm,Yb.In photocatalytic degradation study,the degradation rate of methyl orange(MO)was improved by 40%when GO was added into the TiO_(2)/(Ca,Y)F_(2):Tm,Yb system.In addition,the presence of GO also improves the antibacterial ability of TiO_(2)/(Ca,Y)F_(2):Tm,Yb against Escherichia coli and Staphylococcus aureus.All results reveal high efficacy of GOTiO_(2)/(Ca,Y)F_(2):Tm,Yb under full spectrum light irradiation,in which(Ca,Y)F2:Tm,Yb and TiO2 can improve its utilization of full spectrum sunlight,and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO_(2)/(Ca,Y)F_(2):Tm,Yb.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2016YFB1101103)the National Natural Science Foundation of China(No.51771069)。
文摘Three-dimensional(3D)printed titanium alloy implants hold enormous potential in orthopedic applications to avoid stress shielding.However,titanium alloy is bioinert,limiting its application and making surface modification a necessity.In this paper,porous implants were treated by acid etching and anodizing to improve the bioactivity,which was evaluated by simulated body fluid(SBF)immersion test.The results showed that,after surface modification,micro-nanocomposite structures were obtained on the titanium surface,and after immersing in SBF for 2 weeks,the implants showed a drastically enhanced apatite forming ability,confirming improved bioactivity.However,the surface structures were different at different positions and it is believed that this phenomenon is closely related to the different current densities of the surfaces during anodic oxidation.Our research evaluates the effect of anodic oxidation at different voltages on the surface modification and provides a reference for improving the bioactivity of the medical porous implant surface prepared by 3 D printing.
基金This work was financially supported by the National Key Research and Development Program of China(No.2020YFC1107403)the National Natural Science Foundation of China(No.51771069)the Natural Science Foundation of Hebei Province of China(No.E2020202028).
文摘Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering.In current work,GO-TiO_(2)/(Ca,Y)F_(2):Tm,Yb,a full-spectrum composite photocatalyst,was prepared via hydrothermal processing with TiO_(2)/(Ca,Y)F_(2):Tm,Yb particles deposited on the surface of graphene oxide(GO).The surface properties of GO-TiO_(2)/(Ca,Y)F_(2):Tm,Yb were characterized using various characterization techniques including X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and Brunauer–Emmett–Teller(BET)surface area analyzer.Besides,ultraviolet–visible(UV–Vis)diffuse reflectance spectroscopy,electron spin resonance(ESR)and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO_(2)/(Ca,Y)F_(2):Tm,Yb.In photocatalytic degradation study,the degradation rate of methyl orange(MO)was improved by 40%when GO was added into the TiO_(2)/(Ca,Y)F_(2):Tm,Yb system.In addition,the presence of GO also improves the antibacterial ability of TiO_(2)/(Ca,Y)F_(2):Tm,Yb against Escherichia coli and Staphylococcus aureus.All results reveal high efficacy of GOTiO_(2)/(Ca,Y)F_(2):Tm,Yb under full spectrum light irradiation,in which(Ca,Y)F2:Tm,Yb and TiO2 can improve its utilization of full spectrum sunlight,and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO_(2)/(Ca,Y)F_(2):Tm,Yb.
