Developing all-solid-state polymer electrolytes(SPEs) with high electrochemical performances and stability is of great importance for exploiting of high energy density and safe batteries. Herein, ether linkage and imi...Developing all-solid-state polymer electrolytes(SPEs) with high electrochemical performances and stability is of great importance for exploiting of high energy density and safe batteries. Herein, ether linkage and imidazolium ionic liquid(ILs) are incorporated into the multi-armed polymer backbone though the series and parallel way. The parallel polymeric ionic liquid(P-P(PEGMA-IM)) maximizes the synergistic effect of ILs and ether linkage, which endowed the material with low crystallinity and high flame retardancy. The P-P(PEGMA-IM) based P-SPE presents a high ionic conductivity of 0.489 m S/cm at 60°C, an excellent lithium-ion transference number of 0.46 and a wide electrochemical window of 4.87 V.The assembled lithium metal battery using P-SPE can deliver a capacity of 151 m Ah/g at 0.2 C, and the capacity retention ratio reaches 82% with a columbic efficiency beyond 99%. The overpotential of P-SPE based symmetric battery is 0.08 V, and there is no apparent magnifying even after 130 h cycling. This new design provides a new avenue for exploitation of advanced SPEs for the next-generation batteries.展开更多
In this study,a series of epoxy-based azo molecular glasses with four-arm architecture was synthesized based on an intermediate(MDGA-AN),which was obtained from ring-opening reaction between 4,4'-methylene-bis(N,N...In this study,a series of epoxy-based azo molecular glasses with four-arm architecture was synthesized based on an intermediate(MDGA-AN),which was obtained from ring-opening reaction between 4,4'-methylene-bis(N,N’-diglycidylaniline)and N-methylaniline.The azo compounds were then synthesized through azo-coupling reaction between MDGA-AN and diazonium salts of 4-nitroaniline,4-aminobenzonitrile,4-aminobenzoic acid,4-fluoroaniline and 4-methoxyaniline,respectively.The azo compounds were thoroughly characterized and the photoresponsive properties of their solid films were investigated at three different wavelengths(λex=488,532 and 589 nm).The results show that the electron-withdrawing groups on the azo chromophores can significantly affect the absorption band positions in visible light range,which shift to the longer wavelength with the enhanced push-pull effect.Both photoinduced birefringence and surface-relief-grating formation are closely related to the electronwithdrawing groups and excitation wavelengths of the actinic light,which show significant influences on the growth rates and saturated values of the photoinduced variations.In this series,the azo molecular glasses containing cyano and carboxyl groups as the electron-withdrawing groups show the significantly higher efficiency for both the photoinduced birefringence growth and the SRG formation compared with others under the same light irradiation conditions.The capability of the materials as a photo-storage medium is demonstrated by holographic recording.展开更多
【目的】韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang是韭菜生产中最主要的害虫。通过嗅觉趋性试验测定了3龄幼虫和雌虫对多种味源植物的寄主选择性及行为反应,为进一步研发绿色高效的生态防控技术提供理论依据。【方法】利用"...【目的】韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang是韭菜生产中最主要的害虫。通过嗅觉趋性试验测定了3龄幼虫和雌虫对多种味源植物的寄主选择性及行为反应,为进一步研发绿色高效的生态防控技术提供理论依据。【方法】利用"Y"型嗅觉仪测定幼虫对健康韭菜、灰霉菌侵染韭菜、平菇、大葱和小白菜等几种寄主植物的嗅觉趋性反应,利用四臂嗅觉仪测定雌虫对健康韭菜、机械损伤韭菜、腐殖质和浸泡大豆4种味源材料的行为反应。【结果】"Y"型嗅觉仪测定结果表明健康韭菜、平菇和大葱对3龄幼虫的引诱作用较强;四臂嗅觉仪测定结果表明韭菜迟眼蕈蚊雌虫对机械损伤韭菜和腐殖质表现出较强趋性。【结论】应用嗅觉仪观测了韭菜迟眼蕈蚊3龄幼虫、雌虫对不同味源材料在不同条件下的定向选择行为,此项工作可为韭菜迟眼蕈蚊植物源引诱剂或驱避剂的进一步研发奠定基础。展开更多
基金National Natural Science Foundation of China (No. 51303083)the Natural Science Foundation of Jiangsu Province (No. BK20191293)the Fundamental Research Funds for the Central Universities (No. 30920021123) for financial support。
文摘Developing all-solid-state polymer electrolytes(SPEs) with high electrochemical performances and stability is of great importance for exploiting of high energy density and safe batteries. Herein, ether linkage and imidazolium ionic liquid(ILs) are incorporated into the multi-armed polymer backbone though the series and parallel way. The parallel polymeric ionic liquid(P-P(PEGMA-IM)) maximizes the synergistic effect of ILs and ether linkage, which endowed the material with low crystallinity and high flame retardancy. The P-P(PEGMA-IM) based P-SPE presents a high ionic conductivity of 0.489 m S/cm at 60°C, an excellent lithium-ion transference number of 0.46 and a wide electrochemical window of 4.87 V.The assembled lithium metal battery using P-SPE can deliver a capacity of 151 m Ah/g at 0.2 C, and the capacity retention ratio reaches 82% with a columbic efficiency beyond 99%. The overpotential of P-SPE based symmetric battery is 0.08 V, and there is no apparent magnifying even after 130 h cycling. This new design provides a new avenue for exploitation of advanced SPEs for the next-generation batteries.
基金financial support from the National Natural Science Foundation of China(Nos.51773108 and 51233002)
文摘In this study,a series of epoxy-based azo molecular glasses with four-arm architecture was synthesized based on an intermediate(MDGA-AN),which was obtained from ring-opening reaction between 4,4'-methylene-bis(N,N’-diglycidylaniline)and N-methylaniline.The azo compounds were then synthesized through azo-coupling reaction between MDGA-AN and diazonium salts of 4-nitroaniline,4-aminobenzonitrile,4-aminobenzoic acid,4-fluoroaniline and 4-methoxyaniline,respectively.The azo compounds were thoroughly characterized and the photoresponsive properties of their solid films were investigated at three different wavelengths(λex=488,532 and 589 nm).The results show that the electron-withdrawing groups on the azo chromophores can significantly affect the absorption band positions in visible light range,which shift to the longer wavelength with the enhanced push-pull effect.Both photoinduced birefringence and surface-relief-grating formation are closely related to the electronwithdrawing groups and excitation wavelengths of the actinic light,which show significant influences on the growth rates and saturated values of the photoinduced variations.In this series,the azo molecular glasses containing cyano and carboxyl groups as the electron-withdrawing groups show the significantly higher efficiency for both the photoinduced birefringence growth and the SRG formation compared with others under the same light irradiation conditions.The capability of the materials as a photo-storage medium is demonstrated by holographic recording.
文摘【目的】韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang是韭菜生产中最主要的害虫。通过嗅觉趋性试验测定了3龄幼虫和雌虫对多种味源植物的寄主选择性及行为反应,为进一步研发绿色高效的生态防控技术提供理论依据。【方法】利用"Y"型嗅觉仪测定幼虫对健康韭菜、灰霉菌侵染韭菜、平菇、大葱和小白菜等几种寄主植物的嗅觉趋性反应,利用四臂嗅觉仪测定雌虫对健康韭菜、机械损伤韭菜、腐殖质和浸泡大豆4种味源材料的行为反应。【结果】"Y"型嗅觉仪测定结果表明健康韭菜、平菇和大葱对3龄幼虫的引诱作用较强;四臂嗅觉仪测定结果表明韭菜迟眼蕈蚊雌虫对机械损伤韭菜和腐殖质表现出较强趋性。【结论】应用嗅觉仪观测了韭菜迟眼蕈蚊3龄幼虫、雌虫对不同味源材料在不同条件下的定向选择行为,此项工作可为韭菜迟眼蕈蚊植物源引诱剂或驱避剂的进一步研发奠定基础。
