Given their unique and excellent properties,metal-organic frameworks(MOFs)materials have been used in many scientific fields.EMOFs use energetic materials as ligands,which can provide part of the energy for the system...Given their unique and excellent properties,metal-organic frameworks(MOFs)materials have been used in many scientific fields.EMOFs use energetic materials as ligands,which can provide part of the energy for the system while catalyzing ammonium perchlorate.The energetic material 1.1'-dihydroxyazotetrazole(H_(2)AzTO),as a high-energy nitrogen-rich material,was selected as a ligand.Five kinds of La^(3+),Ce^(3+),Pr^(3+),Nd^(3+),and Sm^(3+)lanthanide EMOFs were synthesized and obtained.Single crystal X-ray diffraction tests were conducted to obtain the crystal structures of EMOFs 1-5,which indicate that they have similar crystal structures.The thermal stabilities of EMOFs 1-5,which are obtained by differential scanning calorimetry(DSC)tests,are improved compa red with that of the ligand.The results of thermicdecomposition of ammonium perchlorate(AP)and AP mixtures with 10 wt%EMOFs 1-5 show that except for AP mixed with 10 wt%co mpound 2,the high-temperature decomposition peak tempe rature of AP mixed with other compounds is significantly advanced(up to 59.3-88.3 K),and the decomposition of AP is continuous and violent.EMOFs 3-5 have good application prospects for the catalytic thermicdecomposition of AP.展开更多
Laser-sensitive primary explosives(LSPEs)are crucial material bases of advanced laser initiation technology.Copper azide(CA),a primary explosive with excellent detonation properties,is limited in preparation and appli...Laser-sensitive primary explosives(LSPEs)are crucial material bases of advanced laser initiation technology.Copper azide(CA),a primary explosive with excellent detonation properties,is limited in preparation and application owing to its extremely high sensitivity.Thus,incorporating CA into LSPEs relies on precise desensitisation strategies.This study successfully implemented a strategy involving sensitive-unit molecular-scale encapsulation.A 2D energetic metal–organic framework(EMOF)[Cu(ATRZ)(N_(3))_(2)]_(n)(CA-ATRZ)(ATRZ=4,4′-azo-1,2,4-triazole)was designed and synthesized via a safe and facile single-crystal-to-single-crystal(SCSC)transformation from a 3D EMOF[Cu(ATRZ)_(3)(NO_(3))_(2)]_(n).Leveraging its distinctive structural attributes of encapsulated confinement,CA-ATRZ is substantially improved in terms of safety compared to CA,while maintaining its superior detonation performance.Furthermore,CA-ATRZ obtained by combining MOFs with CA has outstanding ultrafast direct laser initiation characteristics,is free of toxic metals and perchlorate,has high initiating ability,and has decent thermal stability.This strategy could pave the way for developing advanced high-energy LSPEs.展开更多
基金Project supported by the National Natural Science Foundation of China(21875192)the Basic Research Project of Sichuan Province for Science and Technology Development(2019YJ0355)+1 种基金Outstanding Youth Science and Technology Talents Program of Sichuan(19JCQN0085)the Project of State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology(20fksy04)。
文摘Given their unique and excellent properties,metal-organic frameworks(MOFs)materials have been used in many scientific fields.EMOFs use energetic materials as ligands,which can provide part of the energy for the system while catalyzing ammonium perchlorate.The energetic material 1.1'-dihydroxyazotetrazole(H_(2)AzTO),as a high-energy nitrogen-rich material,was selected as a ligand.Five kinds of La^(3+),Ce^(3+),Pr^(3+),Nd^(3+),and Sm^(3+)lanthanide EMOFs were synthesized and obtained.Single crystal X-ray diffraction tests were conducted to obtain the crystal structures of EMOFs 1-5,which indicate that they have similar crystal structures.The thermal stabilities of EMOFs 1-5,which are obtained by differential scanning calorimetry(DSC)tests,are improved compa red with that of the ligand.The results of thermicdecomposition of ammonium perchlorate(AP)and AP mixtures with 10 wt%EMOFs 1-5 show that except for AP mixed with 10 wt%co mpound 2,the high-temperature decomposition peak tempe rature of AP mixed with other compounds is significantly advanced(up to 59.3-88.3 K),and the decomposition of AP is continuous and violent.EMOFs 3-5 have good application prospects for the catalytic thermicdecomposition of AP.
基金support by the National Natural Science Foundation of China 21975232 is acknowledged(Q.Z.).
文摘Laser-sensitive primary explosives(LSPEs)are crucial material bases of advanced laser initiation technology.Copper azide(CA),a primary explosive with excellent detonation properties,is limited in preparation and application owing to its extremely high sensitivity.Thus,incorporating CA into LSPEs relies on precise desensitisation strategies.This study successfully implemented a strategy involving sensitive-unit molecular-scale encapsulation.A 2D energetic metal–organic framework(EMOF)[Cu(ATRZ)(N_(3))_(2)]_(n)(CA-ATRZ)(ATRZ=4,4′-azo-1,2,4-triazole)was designed and synthesized via a safe and facile single-crystal-to-single-crystal(SCSC)transformation from a 3D EMOF[Cu(ATRZ)_(3)(NO_(3))_(2)]_(n).Leveraging its distinctive structural attributes of encapsulated confinement,CA-ATRZ is substantially improved in terms of safety compared to CA,while maintaining its superior detonation performance.Furthermore,CA-ATRZ obtained by combining MOFs with CA has outstanding ultrafast direct laser initiation characteristics,is free of toxic metals and perchlorate,has high initiating ability,and has decent thermal stability.This strategy could pave the way for developing advanced high-energy LSPEs.
