Antibacterial ceramic was prepared by doping enamel slurry with composite phosphate inorganic antibacterial materials containing rare earth (inorganic antibacterial additives), and then the mechanisms for activating w...Antibacterial ceramic was prepared by doping enamel slurry with composite phosphate inorganic antibacterial materials containing rare earth (inorganic antibacterial additives), and then the mechanisms for activating water and improving seed germinative property were tested by nuclear magnetic resonance (NMR) and the method of testing oxygen dissolved in activated water. Results show that the half peak width of (()^(17)O-NMR) for tap water activated by the antibacterial ceramic drops from 115.36 to 99.15 Hz, and oxygen concentrations of activated water increase by 20%, germinate rate of horsebean and earthnut seeds increases by 12.5% and 7.5%, respectively. Therefore antibacterial ceramic doped enamel slurry with inorganic antibacterial additives containing rare earth can reduce the volume of clusters of water molecules, improve activation of tap water, and promote plant seeds germinate.展开更多
Four kinds of pure silicate ceramic particles,CaSiO3,Ca3SiO5,bredigite and akermanite were prepared and their bactericidal effects were systematically investigated.The phase compositions of these silicate ceramics wer...Four kinds of pure silicate ceramic particles,CaSiO3,Ca3SiO5,bredigite and akermanite were prepared and their bactericidal effects were systematically investigated.The phase compositions of these silicate ceramics were characterized by XRD.The ionic concentration measurement revealed that the Calcium （Ca） ion concentration were relatively higher in Ca3SiO5 and bredigite,and much lower in CaSiO3 and akermanite.Accordingly,the pH values of the four silicate ceramics extracts showed a positive correlation with the particle concentrations.Meanwhile,by decreasing the particle size,higher Ca ion concentrations can be achieved,leading to the increase of aqueous pH value as well.In summary,all of the four silicate ceramics tested in our study showed antibacterial effect in a dose-dependent manner.Generally,the order of their antibacterial activity against E.coli from strong to weak is Ca3SiO5,bredigite,CaSiO3 and akermanite.展开更多
Recently, some famous-brand ceramics produced by over 10 domestic best ceramics manufacturers were grandly promoted by China Ceramics Association, and were placed on noticeable positions of the Ceramics Exhibit Areas ...Recently, some famous-brand ceramics produced by over 10 domestic best ceramics manufacturers were grandly promoted by China Ceramics Association, and were placed on noticeable positions of the Ceramics Exhibit Areas in Chinese Gifts Expo 2002, which was just closed before long. It was said that during the first half展开更多
Titanium dioxide （TiO2） porous ceramic pellets with three dimension nano-structure were prepared using nano TiO2 powder. The TiO2 porous ceramic pellets were composed of TiO2 nanoparticles with 14-16 nm in diameter ...Titanium dioxide （TiO2） porous ceramic pellets with three dimension nano-structure were prepared using nano TiO2 powder. The TiO2 porous ceramic pellets were composed of TiO2 nanoparticles with 14-16 nm in diameter and had porosity of 74.85%. The mean pore size of the TiO2 porous ceramic pellets was 20.73 nm and the main pore size ranged from 3 to 16 nm. The mass loss of the TiO2 ceramic pellets was less than 5% after 20 d immersion in water. The antibacterial properties of the TiO2 pellets were studied. The sterilization rate of Colibacillus （hospital polluted water with bacterium） can reach 99% after 3 h photocatalytic process and these TiO2 pellets are easy to be re-activated and cyclically be used. The shaping mechanism and photocatalysis sterilization mechanism of the TiO2 pellets were discussed.展开更多
Fracture surface and surface of two kind of films of antibacterial bone china with 3% and 5% composite phosphate containing rare earth were characterized by SEM and nanoindenter, respectively, and the hardness and ela...Fracture surface and surface of two kind of films of antibacterial bone china with 3% and 5% composite phosphate containing rare earth were characterized by SEM and nanoindenter, respectively, and the hardness and elastic modulus were measured by nanoindenter at different load conditions. The results show that hardness and elastic modulus of the two kinds of films have obvious change. Elastic modulus versus maximal depth of indentation curves are almost linear. Hardness versus maximal depth of indentation of film with 5% rare earth content curve is nearly linear, while that of 3% increases at first, then decreases. Obvious pile-up of indentation impression of ceramic film with 3% rare earth content is observed with h_f/h_ max<0.7 and different loads, however indentation impression of 5% has no this kind of phenomenon. Special properties of two kinds of ceramic films are because that films are the mixture of crystal and non-crystal materials.展开更多
How to endow bone grafts with long-term antibacterial activity and good bone regenerative ability to achieve the regenerative repair of infected bone defects has been the focus of the clinical treatment of osteomyelit...How to endow bone grafts with long-term antibacterial activity and good bone regenerative ability to achieve the regenerative repair of infected bone defects has been the focus of the clinical treatment of osteomyelitis.The present study introduced a novel one-step route to realizing the co-doping of zinc oxide(ZnO)and zinc ion(Zn^(2+))in biphasic calcium phosphate(BCP)ceramics to utilize their synergistic antibacterial.Compared with the conventional BCP ceramics(BCP-Ca),the ZnO/Zn^(2+)co-doping ones(BCP-Zn)possessed strong antibacterial ability on E.coli and S.aureus as well as stimulated the osteogenic differentiation of bone marrow mesenchymal stem cells(BMSCs)effectively.The synergistic antibacterial mechanism of ZnO and Zn^(2+)was also investigated.BCP-Zn showed excellent osteoinductivity and angiogenesis at three months postoperatively in the canine intramuscular implantation model.Moreover,BCP-Zn exhibited excellent anti-infective ability and bone regenerative repair compared to BCP-Ca and control groups in the infected bone defect model of rat femur.Collectively,these findings suggest that the simultaneous introduction of ZnO/Zn^(2+)could have immense potential to expand the application of osteoinductive BCP ceramics in the regenerative repair of infected bone defects.展开更多
采用水热法一步合成载银羟基磷灰石抗菌粉体(Ag-HA),并将其应用于抗菌陶瓷的制备。研究结果表明水热条件下HA实际载银量与AgNO3加入量存在较好的线性关系。XRD和TEM分析结果显示Ag-HA与HA具有相同的晶体结构,水热条件下Ag+取代Ca2+在HA...采用水热法一步合成载银羟基磷灰石抗菌粉体(Ag-HA),并将其应用于抗菌陶瓷的制备。研究结果表明水热条件下HA实际载银量与AgNO3加入量存在较好的线性关系。XRD和TEM分析结果显示Ag-HA与HA具有相同的晶体结构,水热条件下Ag+取代Ca2+在HA晶体中的位置,生成Ag x Ca10-x(PO4)6(OH)2。Ag-HA长度随Ag+掺入量的增加而增大,当Ag+掺入量增加至1.50%时,Ag-HA由棒状生长为晶须状。选择4.50%Ag-HA作为抗菌粉体,其掺入量为9wt%时,陶瓷的抗菌率>99.9%,此时釉料中Ag3PO4含量为0.56%,低于目前研究中釉料中Ag3PO4添加量(2wt%～4wt%),不但在一定程度上解决了抗菌陶瓷产品成本较高的问题,而且满足JC/T 897-2002(抗菌陶瓷制品抗菌性能)对抗菌陶瓷抗菌性能的要求。展开更多
文摘Antibacterial ceramic was prepared by doping enamel slurry with composite phosphate inorganic antibacterial materials containing rare earth (inorganic antibacterial additives), and then the mechanisms for activating water and improving seed germinative property were tested by nuclear magnetic resonance (NMR) and the method of testing oxygen dissolved in activated water. Results show that the half peak width of (()^(17)O-NMR) for tap water activated by the antibacterial ceramic drops from 115.36 to 99.15 Hz, and oxygen concentrations of activated water increase by 20%, germinate rate of horsebean and earthnut seeds increases by 12.5% and 7.5%, respectively. Therefore antibacterial ceramic doped enamel slurry with inorganic antibacterial additives containing rare earth can reduce the volume of clusters of water molecules, improve activation of tap water, and promote plant seeds germinate.
基金Funded by the Natural Science Foundation of Hubei Province(No.2009CHB006)the China Postdoctoal Science Foundation(No.20060400679)Funds of the Chinese Academy of Key Topics in Innovation Engineering(No.KGCX2-YW-207)
文摘Four kinds of pure silicate ceramic particles,CaSiO3,Ca3SiO5,bredigite and akermanite were prepared and their bactericidal effects were systematically investigated.The phase compositions of these silicate ceramics were characterized by XRD.The ionic concentration measurement revealed that the Calcium （Ca） ion concentration were relatively higher in Ca3SiO5 and bredigite,and much lower in CaSiO3 and akermanite.Accordingly,the pH values of the four silicate ceramics extracts showed a positive correlation with the particle concentrations.Meanwhile,by decreasing the particle size,higher Ca ion concentrations can be achieved,leading to the increase of aqueous pH value as well.In summary,all of the four silicate ceramics tested in our study showed antibacterial effect in a dose-dependent manner.Generally,the order of their antibacterial activity against E.coli from strong to weak is Ca3SiO5,bredigite,CaSiO3 and akermanite.
文摘Recently, some famous-brand ceramics produced by over 10 domestic best ceramics manufacturers were grandly promoted by China Ceramics Association, and were placed on noticeable positions of the Ceramics Exhibit Areas in Chinese Gifts Expo 2002, which was just closed before long. It was said that during the first half
基金Funded by the Applied Basis Research from Sichuan Province, the Research of Photo Purification to Environment with Nano TiO2 (No. 05YJ029-010)
文摘Titanium dioxide （TiO2） porous ceramic pellets with three dimension nano-structure were prepared using nano TiO2 powder. The TiO2 porous ceramic pellets were composed of TiO2 nanoparticles with 14-16 nm in diameter and had porosity of 74.85%. The mean pore size of the TiO2 porous ceramic pellets was 20.73 nm and the main pore size ranged from 3 to 16 nm. The mass loss of the TiO2 ceramic pellets was less than 5% after 20 d immersion in water. The antibacterial properties of the TiO2 pellets were studied. The sterilization rate of Colibacillus （hospital polluted water with bacterium） can reach 99% after 3 h photocatalytic process and these TiO2 pellets are easy to be re-activated and cyclically be used. The shaping mechanism and photocatalysis sterilization mechanism of the TiO2 pellets were discussed.
文摘Fracture surface and surface of two kind of films of antibacterial bone china with 3% and 5% composite phosphate containing rare earth were characterized by SEM and nanoindenter, respectively, and the hardness and elastic modulus were measured by nanoindenter at different load conditions. The results show that hardness and elastic modulus of the two kinds of films have obvious change. Elastic modulus versus maximal depth of indentation curves are almost linear. Hardness versus maximal depth of indentation of film with 5% rare earth content curve is nearly linear, while that of 3% increases at first, then decreases. Obvious pile-up of indentation impression of ceramic film with 3% rare earth content is observed with h_f/h_ max<0.7 and different loads, however indentation impression of 5% has no this kind of phenomenon. Special properties of two kinds of ceramic films are because that films are the mixture of crystal and non-crystal materials.
基金the National Key Research and Development Program of China(Grant No.2022YFC2401801)National Science Foundation of China(Grant No.52002256)+1 种基金Major Project of Sichuan Science and Technology Department(Grant Nos.2022ZDZX0029 and 2021YFS0032)Sichuan University“Zero to one”Innovation Research Project(Grant No.2022SCUH0044).
文摘How to endow bone grafts with long-term antibacterial activity and good bone regenerative ability to achieve the regenerative repair of infected bone defects has been the focus of the clinical treatment of osteomyelitis.The present study introduced a novel one-step route to realizing the co-doping of zinc oxide(ZnO)and zinc ion(Zn^(2+))in biphasic calcium phosphate(BCP)ceramics to utilize their synergistic antibacterial.Compared with the conventional BCP ceramics(BCP-Ca),the ZnO/Zn^(2+)co-doping ones(BCP-Zn)possessed strong antibacterial ability on E.coli and S.aureus as well as stimulated the osteogenic differentiation of bone marrow mesenchymal stem cells(BMSCs)effectively.The synergistic antibacterial mechanism of ZnO and Zn^(2+)was also investigated.BCP-Zn showed excellent osteoinductivity and angiogenesis at three months postoperatively in the canine intramuscular implantation model.Moreover,BCP-Zn exhibited excellent anti-infective ability and bone regenerative repair compared to BCP-Ca and control groups in the infected bone defect model of rat femur.Collectively,these findings suggest that the simultaneous introduction of ZnO/Zn^(2+)could have immense potential to expand the application of osteoinductive BCP ceramics in the regenerative repair of infected bone defects.
文摘采用水热法一步合成载银羟基磷灰石抗菌粉体(Ag-HA),并将其应用于抗菌陶瓷的制备。研究结果表明水热条件下HA实际载银量与AgNO3加入量存在较好的线性关系。XRD和TEM分析结果显示Ag-HA与HA具有相同的晶体结构,水热条件下Ag+取代Ca2+在HA晶体中的位置,生成Ag x Ca10-x(PO4)6(OH)2。Ag-HA长度随Ag+掺入量的增加而增大,当Ag+掺入量增加至1.50%时,Ag-HA由棒状生长为晶须状。选择4.50%Ag-HA作为抗菌粉体,其掺入量为9wt%时,陶瓷的抗菌率>99.9%,此时釉料中Ag3PO4含量为0.56%,低于目前研究中釉料中Ag3PO4添加量(2wt%～4wt%),不但在一定程度上解决了抗菌陶瓷产品成本较高的问题,而且满足JC/T 897-2002(抗菌陶瓷制品抗菌性能)对抗菌陶瓷抗菌性能的要求。
