Ce3+/Dy3+/Tb3+/Eu3+/Mn2+and Cr3+ions co-doped Zn3 Al2 Ge2 O10 phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn3 Al2 Ge2 O10 phosp...Ce3+/Dy3+/Tb3+/Eu3+/Mn2+and Cr3+ions co-doped Zn3 Al2 Ge2 O10 phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn3 Al2 Ge2 O10 phosphor,Emission,excitation spectra and decay curves confirm the tunable luminescence.Different degrees of the decrease of emission FWHM in Zn3 Al2 Ge2 O10:0.02 Cr3+,RE(RE=Ce3+,Dy3+,Tb3+,Eu3+)and Zn3 Al2 Ge2 O10:0.02 Cr3+,Mn2+are observed.The reason of variable FWHM is the effect of crystal field splitting and nephelauxetic effect,and the nephelauxetic effect is dominant.Therefore,the emission FWHM decreases with the increasing concentration of Mn2+/Tb3+/Eu3+in Zn3 Al2 Ge2 O10:0.02 Cr3+,and for Zn3 Al2 Ge2 O10:0.02 Cr3+,Ce3+and Zn3 Al2 Ge2 O10:0.02 Cr3+,Dy3+,it is a constant.The variation of Zn3 Al2 Ge2 O10:0.02 Cr3+,Tb3+is more obvious than that of Zn3 Al2 Ge2 O10:0.02 Cr3+,Eu3+,because Tb3+ion has smaller electronegativity.Thus,the tunable luminescence of Cr3+can be realized by co-doping different ions.And these phosphors have potential applications in light-emitting diodes for plant growth.展开更多
Zinc(Zn)-based composites are promising biodegradable bone-implant materials because of their good biocompatibility,processability,and biodegradability.Nevertheless,the low interfacial bonding strength,co-ordinated de...Zinc(Zn)-based composites are promising biodegradable bone-implant materials because of their good biocompatibility,processability,and biodegradability.Nevertheless,the low interfacial bonding strength,co-ordinated deformation capacity,and mechanical strength of current Zn-based composites hinder their clinical application.In this study,we developed a biodegradable in situ 4Mg_(2)Ge/Zn-0.3Cu-0.05P composite(denoted ZMGCP)via phosphorus(P)modification and hot-rolling for bone-implant applications.The mechanical prop-erties,corrosion behavior,biotribological performance,in vitro cytocompatibility and osteogenic differentiation,and in vivo osteogenesis and osteointegration of the as-cast(AC)and hot-rolled(HR)ZMGCP samples were systematically evaluated and compared to those of 4Mg_(2)Ge/Zn-0.3Cu(denoted ZMGC).The primary and eutectic reinforcement Mg_(2)Ge phases formed during solidification were refined after P modification and hot-rolling.The HR ZMGCP exhibited the best tensile properties among all the samples with an ultimate tensile strength of 288.9 MPa,a yield strength of 194.5 MPa,and an elongation of 17.7%.The HR ZMGCP showed the lowest corrosion rate of 336μm/a,186μm/a,and 61.7μm/a as measured by potentiodynamic polarization,electrochemical impedance spectroscopy,and immersion testing,respectively,among all the samples in Hanks’solution.The HR ZMGCP also showed higher biotribological resistance than its ZMGC counterpart.The HR ZMGCP exhibited the highest in vitro cytocompatibility,the best osteogenesis capability and angiogenesis property among the HR samples of pure Zn,ZMGC,and ZMGCP.Furthermore,the HR ZMGCP displayed complete in vivo biocompati-bility,osteogenesis,osteointegration capability,and an appropriate degradation rate,showing significant po-tential for a biodegradable bone-implant material.展开更多
基金Projects supported by the National Natural Science Foundation of China(61575019,11474018,61775013),ChinaThe authors express the thanks to the Fundamental ResearchFunds for the Central Universities under Grant No. 2018YJS166,China and the Fundamental Research Funds for the Central Universitieswith the Grant No. 2016JBM066,No. 2017RC015, No.2017JBZ105, China.
文摘Ce3+/Dy3+/Tb3+/Eu3+/Mn2+and Cr3+ions co-doped Zn3 Al2 Ge2 O10 phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn3 Al2 Ge2 O10 phosphor,Emission,excitation spectra and decay curves confirm the tunable luminescence.Different degrees of the decrease of emission FWHM in Zn3 Al2 Ge2 O10:0.02 Cr3+,RE(RE=Ce3+,Dy3+,Tb3+,Eu3+)and Zn3 Al2 Ge2 O10:0.02 Cr3+,Mn2+are observed.The reason of variable FWHM is the effect of crystal field splitting and nephelauxetic effect,and the nephelauxetic effect is dominant.Therefore,the emission FWHM decreases with the increasing concentration of Mn2+/Tb3+/Eu3+in Zn3 Al2 Ge2 O10:0.02 Cr3+,and for Zn3 Al2 Ge2 O10:0.02 Cr3+,Ce3+and Zn3 Al2 Ge2 O10:0.02 Cr3+,Dy3+,it is a constant.The variation of Zn3 Al2 Ge2 O10:0.02 Cr3+,Tb3+is more obvious than that of Zn3 Al2 Ge2 O10:0.02 Cr3+,Eu3+,because Tb3+ion has smaller electronegativity.Thus,the tunable luminescence of Cr3+can be realized by co-doping different ions.And these phosphors have potential applications in light-emitting diodes for plant growth.
基金supported by the Zhejiang Public Welfare Technology Application Research Project of China(No.LTGY24H140002,No.LTGY23H140002,No.LGF22H140008)financial support for this research by the Australian Research Council(ARC)through the Discovery Project DP240101131.
文摘Zinc(Zn)-based composites are promising biodegradable bone-implant materials because of their good biocompatibility,processability,and biodegradability.Nevertheless,the low interfacial bonding strength,co-ordinated deformation capacity,and mechanical strength of current Zn-based composites hinder their clinical application.In this study,we developed a biodegradable in situ 4Mg_(2)Ge/Zn-0.3Cu-0.05P composite(denoted ZMGCP)via phosphorus(P)modification and hot-rolling for bone-implant applications.The mechanical prop-erties,corrosion behavior,biotribological performance,in vitro cytocompatibility and osteogenic differentiation,and in vivo osteogenesis and osteointegration of the as-cast(AC)and hot-rolled(HR)ZMGCP samples were systematically evaluated and compared to those of 4Mg_(2)Ge/Zn-0.3Cu(denoted ZMGC).The primary and eutectic reinforcement Mg_(2)Ge phases formed during solidification were refined after P modification and hot-rolling.The HR ZMGCP exhibited the best tensile properties among all the samples with an ultimate tensile strength of 288.9 MPa,a yield strength of 194.5 MPa,and an elongation of 17.7%.The HR ZMGCP showed the lowest corrosion rate of 336μm/a,186μm/a,and 61.7μm/a as measured by potentiodynamic polarization,electrochemical impedance spectroscopy,and immersion testing,respectively,among all the samples in Hanks’solution.The HR ZMGCP also showed higher biotribological resistance than its ZMGC counterpart.The HR ZMGCP exhibited the highest in vitro cytocompatibility,the best osteogenesis capability and angiogenesis property among the HR samples of pure Zn,ZMGC,and ZMGCP.Furthermore,the HR ZMGCP displayed complete in vivo biocompati-bility,osteogenesis,osteointegration capability,and an appropriate degradation rate,showing significant po-tential for a biodegradable bone-implant material.
