Photosensitization related to energy/electron transfer process is of great importance to natural photosynthesis.Herein,we proposed a promising strategy to improve the sensitizing ability of the typical photoactive MOF...Photosensitization related to energy/electron transfer process is of great importance to natural photosynthesis.Herein,we proposed a promising strategy to improve the sensitizing ability of the typical photoactive MOFs(UiO-Ir)by engineering its metal coordination center with NBI(1,8-naphthalenebenzimidizole)chromophore.The resulting MOFs(UiO-Ir-NBI)exhibited a strong sensitizing ability for significantly boosting photosynthesis.Impressively,the catalytic yield of 2-chloroethyl ethyl sulfoxide with UiO-Ir-NBI can reach 99%,over 6 times higher than that with UiO-Ir(16.4%).Moreover,UiO-Ir-NBI exhibited an excellent catalytic stability and a broad substrate tolerance,highlighting its great application prospect.Systematic investigations revealed that the strong visible light absorption,long excited state lifetime and efficient electron-hole separation of UiO-Ir-NBI greatly contributed to harvesting visible light and facilitating interface electron/energy transfer for efficient solar energy utilization.This work provides a new horizon to boost photosythesis of MOFs by engineering their metal sensitizing centers at a molecular level.展开更多
The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that...The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ℃ annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and 7 phase, which leads to the work-hardening state of 7 phase kept unchanged during annealing process, and therefore, the critical slip stress of y phase increased. Thus, the plastic deformation of ~ phase reduced during the compression process, and the SME increased.展开更多
基金supported by National Key R&D Program of China(No.2019YFA0705201)National Natural Science Foundation of China(No.22171209)。
文摘Photosensitization related to energy/electron transfer process is of great importance to natural photosynthesis.Herein,we proposed a promising strategy to improve the sensitizing ability of the typical photoactive MOFs(UiO-Ir)by engineering its metal coordination center with NBI(1,8-naphthalenebenzimidizole)chromophore.The resulting MOFs(UiO-Ir-NBI)exhibited a strong sensitizing ability for significantly boosting photosynthesis.Impressively,the catalytic yield of 2-chloroethyl ethyl sulfoxide with UiO-Ir-NBI can reach 99%,over 6 times higher than that with UiO-Ir(16.4%).Moreover,UiO-Ir-NBI exhibited an excellent catalytic stability and a broad substrate tolerance,highlighting its great application prospect.Systematic investigations revealed that the strong visible light absorption,long excited state lifetime and efficient electron-hole separation of UiO-Ir-NBI greatly contributed to harvesting visible light and facilitating interface electron/energy transfer for efficient solar energy utilization.This work provides a new horizon to boost photosythesis of MOFs by engineering their metal sensitizing centers at a molecular level.
基金financially supported by the China Postdoctoral Science Foundation Funded Project(No. 2015M571269)supported by the Natural Science Foundation of China(Nos.51271065,51271069 and 51201062)
文摘The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ℃ annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and 7 phase, which leads to the work-hardening state of 7 phase kept unchanged during annealing process, and therefore, the critical slip stress of y phase increased. Thus, the plastic deformation of ~ phase reduced during the compression process, and the SME increased.
