Due to its extremely low electrostatic sensitivity,copper azide primary explosive is greatly limited in practical applications.In this study,a composite film with Cu-MOF in-situ growth on carbon nanofilm was prepared ...Due to its extremely low electrostatic sensitivity,copper azide primary explosive is greatly limited in practical applications.In this study,a composite film with Cu-MOF in-situ growth on carbon nanofilm was prepared by electrospinning and solvothermal methods,and CNF@Cu-N3film with electrostatic safety was obtained by carbonization and azide later.Its electrostatic sensitivity(E50)was greatly increased from 0.05 mJ of raw materials to 4.06 mJ,and still maintained a good detonation performance which could successfully detonate the CL-20 secondary explosive.This is mainly due to the synergistic effect of the carbon film and the MOF structure,which greatly improves the conductivity of the entire system and the uniform distribution of copper particles,providing a new preparation strategy for metal azide film that is suitable for the micro-initiator device.展开更多
Copper azide(CA), as a primary explosive with high energy density, has not been practically used so far because of its high electrostatic sensitivity. The Cu2O@HKUST-1 core-shell structure hybrid material was synthesi...Copper azide(CA), as a primary explosive with high energy density, has not been practically used so far because of its high electrostatic sensitivity. The Cu2O@HKUST-1 core-shell structure hybrid material was synthesized by the “bottle around ship” methodology in this research by regulating the dissolution rate of Cu2O and the generation rate of metal-organic framework(MOF) materials. Cu2O@HKUST-1 was carbonized to form a Cu O@porous carbon(CuO@PC) composite material. CuO@PC was synthesized into a copper azide(CA) @PC composite energetic material through a gas-solid phase in-situ azidation reaction.CA is encapsulated in PC framework, which acts as a nanoscale Faraday cage, and its excellent electrical conductivity prevents electrostatic charges from accumulating on the energetic material’s surface. The CA@PC composite energetic material has a CA content of 89.6%, and its electrostatic safety is nearly 30times that of pure CA(1.47 mJ compared to 0.05 mJ). CA@PC delivers an outstanding balance of safety and energy density compared to similar materials.展开更多
The development trend of miniaturization, chipization, integration, and intelligence of new energetic devices has put forward higher requirements for primary explosives, and the toxicity of lead-containing initiating ...The development trend of miniaturization, chipization, integration, and intelligence of new energetic devices has put forward higher requirements for primary explosives, and the toxicity of lead-containing initiating explosives has also caused increasing concerns. Nano copper azide, due to its green and high-energy characteristics, has attracted increasing interest from researchers in recent years. The research progress of Nano copper azide energetic materials is summarized from the design and preparation of composite energetic materials, and the analysis of sensitivity changes. On this basis, the key points to realize its application prospects are discussed: Develop the preparation method of carbon material modification and the combination of processing and forming to prepare new composite materials to make up for their overly sensitive defects, while giving full play to their advantages of high energy density. By comparing the existing research progress of Nano copper azide, we can understand its performance parameters more systematically, and guide the further application of Nano copper azide. .展开更多
A novel cuprous azide complex with the formula of [Cu2（dmpz）（N3）2]n（1, dmpz： 2,6-dimethylpyrazine） has been synthesized through hydrothermal synthesis with the reducibility of H3PO3 and structurally characteriz...A novel cuprous azide complex with the formula of [Cu2（dmpz）（N3）2]n（1, dmpz： 2,6-dimethylpyrazine） has been synthesized through hydrothermal synthesis with the reducibility of H3PO3 and structurally characterized by single-crystal X-ray diffraction method. Single-crystal X-ray diffraction analysis reveals the title complex represents a three-dimensional network structure featuring 2D [Cu N3]n plane units bridged by bridging dmpz ligands to form a 3D network. Research results reveal that 1 has lower impact sensitivity and friction sensitivity, which may be expected to become insensitive energetic material and have potential applications. Crystal data： monoclinic, space group C2/c, a = 17.8599（15）, b = 8.2889（5）, c = 14.8076（14） A, β = 113.2580（10）o, V = 2014.0（3） A3, Z = 8, S = 1.025, the final R = 0.0303, w R = 0.0825 for 1460 observed reflections with I 2σ（I） and R = 0.0386, wR = 0.0870 for all reflections. In addition, elemental analysis, IR, and sensitivity characterization are presented.展开更多
Copper azide with high density was successfully synthesized by in-situ reaction of nanoporous copper(NPC)precursor with HN_(3) gaseous.NPC with pore size of about 529 nm has been prepared by electroless plating using ...Copper azide with high density was successfully synthesized by in-situ reaction of nanoporous copper(NPC)precursor with HN_(3) gaseous.NPC with pore size of about 529 nm has been prepared by electroless plating using polystyrene(PS)as templates.The copper shells thickness of NPC was controlled by adjusting the PS loading amount.The effects of copper shell on the morphology,structure and density of copper azide were investigated.The conversion increased from 87.12%to 95.31%when copper shell thickness decrease from 100 to 50 nm.Meanwhile,the density of copper azide prepared by 529 nm NPC for 24 h was up to 2.38 g/cm^(3).The hollow structure of this NPC was filled by swelling of copper azide which guaranteed enough filling volume for keeping the same shape as well as improving the charge density.Moreover,HNS-IV explosive was successfully initiated by copper azide with minimum charge thickness of 0.55 mm,showing that copper azide prepared has excellent initiation performance,which has more advantages in the application of miniaturized explosive systems.展开更多
A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The c...A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pbcn with a = 24.588（5）, b = 10.377（2）, c = 13.022（3） A, V= 3322.6（12） A^3, Z = 8, Dc = 1.874 g/cm^3, Mr = 468.65, λ（MoKa） = 0.71073 A,μ = 6.130 mm^-1, F（000） = 1832, R = 0.0637 and wR = 0.1176. The Cu atom in the complex is five-coordinated in a square pyramidal geometry by three donor atoms of the Schiff-base ligand, and two N atoms from two bridging azide ligands. The [2,4-dibromo-6-[（3-dimethylaminopropylimino）methyl]phenolato]copper（II） units are linked by the bridging azide ligands, giving zigzag polymeric chains with backbones of the [--Cu-N-N-N--Cu]n type running along the b axis.展开更多
The title compound formulated as Cu2（C13H11N6OF2）（N3）3CH3OH was synthesized and structurally characterized by elemental analysis,IR and single-crystal X-ray diffraction.In the structure of the complex,the deproton...The title compound formulated as Cu2（C13H11N6OF2）（N3）3CH3OH was synthesized and structurally characterized by elemental analysis,IR and single-crystal X-ray diffraction.In the structure of the complex,the deprotonated fluconazole and azide anion link two copper centers to construct a binuclear SBU and the azide anion exhibits a μ1,1-coordination mode.Each triazole group of fluconazole links two SBUs and the compound exhibits a chain-like architecture with strong antiferromagnetism.展开更多
Main observation and conclusion A copper-catalyzed radical cyclization of cyclobutanone oxime esters and vinyl azide is described.This method provides facile access to cyanoalkyl-substituted phenanthridines and quinox...Main observation and conclusion A copper-catalyzed radical cyclization of cyclobutanone oxime esters and vinyl azide is described.This method provides facile access to cyanoalkyl-substituted phenanthridines and quinoxalines with excellent isolated yields.Moreover,these reactions proceed under mild conditions with a board substrate scope and excellent functional group tolerance.展开更多
基金financial support from the National Natural Science Foundation of China(Grant No.12102051)the State Key Laboratory of Explosion Science and Technology(Grant No.QNKT2022-04)。
文摘Due to its extremely low electrostatic sensitivity,copper azide primary explosive is greatly limited in practical applications.In this study,a composite film with Cu-MOF in-situ growth on carbon nanofilm was prepared by electrospinning and solvothermal methods,and CNF@Cu-N3film with electrostatic safety was obtained by carbonization and azide later.Its electrostatic sensitivity(E50)was greatly increased from 0.05 mJ of raw materials to 4.06 mJ,and still maintained a good detonation performance which could successfully detonate the CL-20 secondary explosive.This is mainly due to the synergistic effect of the carbon film and the MOF structure,which greatly improves the conductivity of the entire system and the uniform distribution of copper particles,providing a new preparation strategy for metal azide film that is suitable for the micro-initiator device.
基金the financial support by Postgraduate Research & Practice Innovation Program from Jiangsu Science and Technology Department under Grant number KYCX19_0320。
文摘Copper azide(CA), as a primary explosive with high energy density, has not been practically used so far because of its high electrostatic sensitivity. The Cu2O@HKUST-1 core-shell structure hybrid material was synthesized by the “bottle around ship” methodology in this research by regulating the dissolution rate of Cu2O and the generation rate of metal-organic framework(MOF) materials. Cu2O@HKUST-1 was carbonized to form a Cu O@porous carbon(CuO@PC) composite material. CuO@PC was synthesized into a copper azide(CA) @PC composite energetic material through a gas-solid phase in-situ azidation reaction.CA is encapsulated in PC framework, which acts as a nanoscale Faraday cage, and its excellent electrical conductivity prevents electrostatic charges from accumulating on the energetic material’s surface. The CA@PC composite energetic material has a CA content of 89.6%, and its electrostatic safety is nearly 30times that of pure CA(1.47 mJ compared to 0.05 mJ). CA@PC delivers an outstanding balance of safety and energy density compared to similar materials.
文摘The development trend of miniaturization, chipization, integration, and intelligence of new energetic devices has put forward higher requirements for primary explosives, and the toxicity of lead-containing initiating explosives has also caused increasing concerns. Nano copper azide, due to its green and high-energy characteristics, has attracted increasing interest from researchers in recent years. The research progress of Nano copper azide energetic materials is summarized from the design and preparation of composite energetic materials, and the analysis of sensitivity changes. On this basis, the key points to realize its application prospects are discussed: Develop the preparation method of carbon material modification and the combination of processing and forming to prepare new composite materials to make up for their overly sensitive defects, while giving full play to their advantages of high energy density. By comparing the existing research progress of Nano copper azide, we can understand its performance parameters more systematically, and guide the further application of Nano copper azide. .
基金Supported by the National Natural Science Foundation of China(No.21203160)Education Department Foundation of Shaanxi Province(No.12JK0631)+1 种基金Natural Science Foundation of Shaanxi Province(No.2013JM2013)Special Research Fund of Xianyang Normal University(No.11XSYK204,11XSYK205,12XSYK023)
文摘A novel cuprous azide complex with the formula of [Cu2（dmpz）（N3）2]n（1, dmpz： 2,6-dimethylpyrazine） has been synthesized through hydrothermal synthesis with the reducibility of H3PO3 and structurally characterized by single-crystal X-ray diffraction method. Single-crystal X-ray diffraction analysis reveals the title complex represents a three-dimensional network structure featuring 2D [Cu N3]n plane units bridged by bridging dmpz ligands to form a 3D network. Research results reveal that 1 has lower impact sensitivity and friction sensitivity, which may be expected to become insensitive energetic material and have potential applications. Crystal data： monoclinic, space group C2/c, a = 17.8599（15）, b = 8.2889（5）, c = 14.8076（14） A, β = 113.2580（10）o, V = 2014.0（3） A3, Z = 8, S = 1.025, the final R = 0.0303, w R = 0.0825 for 1460 observed reflections with I 2σ（I） and R = 0.0386, wR = 0.0870 for all reflections. In addition, elemental analysis, IR, and sensitivity characterization are presented.
基金the financial support provided by the National Natural Science Foundation of China(No.11872013)。
文摘Copper azide with high density was successfully synthesized by in-situ reaction of nanoporous copper(NPC)precursor with HN_(3) gaseous.NPC with pore size of about 529 nm has been prepared by electroless plating using polystyrene(PS)as templates.The copper shells thickness of NPC was controlled by adjusting the PS loading amount.The effects of copper shell on the morphology,structure and density of copper azide were investigated.The conversion increased from 87.12%to 95.31%when copper shell thickness decrease from 100 to 50 nm.Meanwhile,the density of copper azide prepared by 529 nm NPC for 24 h was up to 2.38 g/cm^(3).The hollow structure of this NPC was filled by swelling of copper azide which guaranteed enough filling volume for keeping the same shape as well as improving the charge density.Moreover,HNS-IV explosive was successfully initiated by copper azide with minimum charge thickness of 0.55 mm,showing that copper azide prepared has excellent initiation performance,which has more advantages in the application of miniaturized explosive systems.
文摘A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pbcn with a = 24.588（5）, b = 10.377（2）, c = 13.022（3） A, V= 3322.6（12） A^3, Z = 8, Dc = 1.874 g/cm^3, Mr = 468.65, λ（MoKa） = 0.71073 A,μ = 6.130 mm^-1, F（000） = 1832, R = 0.0637 and wR = 0.1176. The Cu atom in the complex is five-coordinated in a square pyramidal geometry by three donor atoms of the Schiff-base ligand, and two N atoms from two bridging azide ligands. The [2,4-dibromo-6-[（3-dimethylaminopropylimino）methyl]phenolato]copper（II） units are linked by the bridging azide ligands, giving zigzag polymeric chains with backbones of the [--Cu-N-N-N--Cu]n type running along the b axis.
基金Supported by the Chongqing University Postgraduate Science (No.200911A1B0010317)Innovation Fund and Innovative Talent Training Projects of the Third Stage of "211 Project"of Chongqing University(No.S-09103)+1 种基金the Natural Science Young Scholars Foundation of Chongqing University,Large-scale Instrument and Equipment Open Foundation of Chongqing UniversityScientific Research Start-up Foundation of Chongqing University
文摘The title compound formulated as Cu2（C13H11N6OF2）（N3）3CH3OH was synthesized and structurally characterized by elemental analysis,IR and single-crystal X-ray diffraction.In the structure of the complex,the deprotonated fluconazole and azide anion link two copper centers to construct a binuclear SBU and the azide anion exhibits a μ1,1-coordination mode.Each triazole group of fluconazole links two SBUs and the compound exhibits a chain-like architecture with strong antiferromagnetism.
基金We are grateful to the National Natural Science Foundation of China(No.NSFC-21871046).
文摘Main observation and conclusion A copper-catalyzed radical cyclization of cyclobutanone oxime esters and vinyl azide is described.This method provides facile access to cyanoalkyl-substituted phenanthridines and quinoxalines with excellent isolated yields.Moreover,these reactions proceed under mild conditions with a board substrate scope and excellent functional group tolerance.
