NF3 decomposition over transition metal oxides coated MgO reagents in the absence of water is investigated. The results show that NF3 can be decomposed completely over pure MgO but the time of NF3 steady full conversi...NF3 decomposition over transition metal oxides coated MgO reagents in the absence of water is investigated. The results show that NF3 can be decomposed completely over pure MgO but the time of NF3 steady full conversion kept as short as 80 min, while the reactivities of coated MgO reagents were remarkably enhanced by transition metal oxides, for example the time of NF3 complete conversion over 12%Fe/MgO extended to 380 min. It is suggested that not only an increase in surface area but also a significant enhancement in the fluorination of MgO substrate caused by the surface transition metal oxides result in an improved reactivity of coated MgO reagents for NF3 decomposition.展开更多
The mechanical properties and corrosion resistance of magnesium alloy composites were improved bythe addition of MgO surface modified tricalcium phosphate ceramic nanoparticles (m-β-TCP). Mg-3Zn-0.8Zr composites with...The mechanical properties and corrosion resistance of magnesium alloy composites were improved bythe addition of MgO surface modified tricalcium phosphate ceramic nanoparticles (m-β-TCP). Mg-3Zn-0.8Zr composites with unmodified (MZZT) and modified (MZZMT) nanoparticles were produced byhigh shear mixing technology. Effects of MgO m-β-TCP nanoparticles on the microstructure, mechanicalproperties, electrochemical corrosion properties and cytocompatibility of Mg-Zn-Zr/β-TCP compositeswere investigated. After hot extrusion deformation and dynamic recrystallization, the grain size ofMZZMT was the half size of MZZT and the distribution of m-β-TCP particles in the matrix was moreuniform than β-TCP particles. The yield tensile strength (YTS), ultimate tensile strength (UTS), andcorrosion potential (Ecorr) of MZZMT were higher than MZZT;the corrosion current density (Icorr) ofMZZMT was lower than MZZT. Cell proliferation of co-cultured MZZMT and MZZT composite sampleswere roughly the same and the cell number at each time point is higher for MZZMT than for MZZTsamples.展开更多
基金financially supported by the National Natural Science Foundation of China(No.20976149)
文摘NF3 decomposition over transition metal oxides coated MgO reagents in the absence of water is investigated. The results show that NF3 can be decomposed completely over pure MgO but the time of NF3 steady full conversion kept as short as 80 min, while the reactivities of coated MgO reagents were remarkably enhanced by transition metal oxides, for example the time of NF3 complete conversion over 12%Fe/MgO extended to 380 min. It is suggested that not only an increase in surface area but also a significant enhancement in the fluorination of MgO substrate caused by the surface transition metal oxides result in an improved reactivity of coated MgO reagents for NF3 decomposition.
基金The authors acknowledge the financial support for this work from the National Nature Science Foundation of China(No.51371126 and No.51271131)Science and Technology supporting program in Tianjin(No.14ZCZDGX00007)Major science and technology projects in Tianjin(No.15ZXQXSY00080).
文摘The mechanical properties and corrosion resistance of magnesium alloy composites were improved bythe addition of MgO surface modified tricalcium phosphate ceramic nanoparticles (m-β-TCP). Mg-3Zn-0.8Zr composites with unmodified (MZZT) and modified (MZZMT) nanoparticles were produced byhigh shear mixing technology. Effects of MgO m-β-TCP nanoparticles on the microstructure, mechanicalproperties, electrochemical corrosion properties and cytocompatibility of Mg-Zn-Zr/β-TCP compositeswere investigated. After hot extrusion deformation and dynamic recrystallization, the grain size ofMZZMT was the half size of MZZT and the distribution of m-β-TCP particles in the matrix was moreuniform than β-TCP particles. The yield tensile strength (YTS), ultimate tensile strength (UTS), andcorrosion potential (Ecorr) of MZZMT were higher than MZZT;the corrosion current density (Icorr) ofMZZMT was lower than MZZT. Cell proliferation of co-cultured MZZMT and MZZT composite sampleswere roughly the same and the cell number at each time point is higher for MZZMT than for MZZTsamples.
