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127 results on '"Xu, Kang-Zhen"'

16. Preparation of Amorphous Nano-NiO and Its Catalytic Performance on AP and GAP Based Propellant.

Author

SONG Yuan-hang, QU Wen-gang, ZHAO Feng-qi, NIU Shi-yao, CHEN Yong, and XU Kang-zhen

Subjects
PROPELLANTS, X-ray photoelectron spectroscopy, DIFFERENTIAL scanning calorimetry, TRANSMISSION electron microscopy, AMMONIUM perchlorate, SCANNING electron microscopy
Abstract

To investigate the catalytic decomposition performance of amorphous nano-sized oxides with short-range ordered and long-range disordered for energetic materials, amorphous nano-NiO was prepared by high-temperature calcination using nickel acetylacetonate as the raw material. The composition, structure and its catalytic decomposition properties on ammonium perchlorate (AP) and GAP-based propellant were investigated by X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N2 adsorption-desorption (BET) and differential scanning calorimetry (DSC). The results show that the amorphous nano-NiO can reduce the thermal decomposition peak temperature of AP from 406. 4°C to 309. 5°C, the apparent activation energy can be reduced from 158. 17 kj/mol to 129. 82 kj/mol, and the heat release increased from 747. 7 J/g to 1 780 J/g. Compared with crystalline nano-NiO nanoparticles, amorphous NiO increases the burning rate of GAP-based propellant by about 10% and reduces the pressure index by about 9. 7 %% . [ABSTRACT FROM AUTHOR]

Published
2022
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19. Synthesis, Structure Characteristic and Thermal Behavior of Two New Metal-organic Azo-triazole Compounds: [Zn(phen)3] ZTO 6H2O and [Cu(phen)3] ZTO 6H2O

Author

Cao Wenli, Zheng Hui, Ding Zimei, Huang Jie, XU Kang-zhen, and Song Jirong

Subjects
Materials science, 010405 organic chemistry, Thermal decomposition, Triazole, Infrared spectroscopy, General Chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Metal, Crystallography, chemistry.chemical_compound, chemistry, Octahedron, visual_art, visual_art.visual_art_medium, Thermal stability, Single crystal, Coordination geometry
Abstract

[Zn(phen)3] ZTO 6H2O(1) and [Cu(phen)3] ZTO 6H2O(2) were synthesized by the reaction of Zn(NO3)2 6H2O/Cu(NO3)2 3H2O with 4,4-azo-1H-1,2,4-triazol-5-one(ZTO) and 1,10-phenanthroline(phen). The two compounds were characterized by elemental analysis and IR spectrum analysis, respectively. Compound 1 was also characterized by single crystal X-ray diffraction analysis. For compound 1, the coordination geometry around the Zn2+ is a distorted octahedron, with the bite angles of 76.7(3)°―77.6(4)° for all three phen ligands. Moreover, the thermal behaviors and thermal decomposition kinetics were studied and analyzed. Besides, thermal stability and safety parameters(TSADT, Tb) are 164.7 and 166.4 °C for compound 1, and 149.6 and 150.8 °C for compound 2, respectively.

Published
2018

28. Synthesis, crystal structure, and thermal properties of Ni(NH3)4(AFT)2.

Author

Wei, Shu-han, Ma, Xiao, Ding, Zi-mei, Xu, Kang-zhen, Gao, Hong-xu, Huang, Jie, and Zhao, Feng-qi

Subjects
THERMAL properties, ORTHORHOMBIC crystal system, CRYSTAL structure, ELEMENTAL analysis, X-ray diffraction measurement, CRYSTALLIZATION kinetics
Abstract

Ni(NH3)4(AFT)2 [NiC6H16N18O2, AFT = 4-amino-3-(5-tetrazolate)furazan] is synthesized and characterized by elemental analysis and Fourier-transform infrared spectroscopy for the first time. X-ray diffraction measurements are used to determine the crystal structure of compound 1. The results demonstrate that compound 1 crystallized in the orthorhombic crystal system. The nickel(II) ion is six-coordinated by N atoms from two AFT-ligands and four NH3 molecules. Its thermal properties are investigated by differential scanning calorimetry and thermogravimetry-derivative thermogravimetry methods, with the results demonstrating that the differential scanning calorimetry curve exhibits two endothermic and one exothermic processes. The endothermic processes are in the range of 130–510 °C with a peak temperature of 188 °C. The temperature from 230 to 400 °C is the exothermic process in which the peak temperature is 314.58 °C. In addition, Kissinger's and Ozawa-Doyle's methods are used for calculating the non-isothermal kinetics parameters. Moreover, the apparent activation energy (E), safety, and thermal stability parameters (T SADT, T TIT, T b) for Ni(NH3)4(AFT)2 are calculated. In addition, the calculated thermodynamic functions (∆S ≠, ∆H ≠, and ∆G ≠) for the exothermic decomposition process of Ni(NH3)4(AFT)2 are 55.07 J mol−1 K−1, 196.18 kJ mol−1, and 164.90 kJ mol−1, respectively. [ABSTRACT FROM AUTHOR]

Published
2021
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29. A new coordination compound based on 4-amino-3-(tetrazol-5-yl)-furazan (HAFT): preparation, crystal structure, and thermal properties

Author

Ding, Zi-Mei, Cao, Wen-Li, Hang, Xiao-Jing, Ma, Xiao, Zheng, Hui, Xu, Kang-Zhen, and Huang, Jie

Abstract

The green nitrogen-rich coordination compound Cd(SCZ)2(AFT)2 (1) (AFT =4-amino-3-(5-tetrazolate)-furazan and SCZ = semicarbazide) was first synthesized and characterized by EA and Fourier Transform Infrared (FT-IR). The single crystal was cultivated and determined with X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P21/c. A Cd2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, two nitrogen atoms are from the two AFT ions and the other four atoms are from two SCZ molecules. The thermal decomposition behavior of 1 was studied with DSC and TG-DTG methods. The apparent activation energy (E), thermal stability, and safety parameters (T SADT, T TIT, and T b) were calculated for 1. Moreover, entropy of activation (ΔS ≠), enthalpy of activation (ΔH ≠), free energy of activation (ΔG ≠), specific heat capacity (C p), and impact sensitivity were also discussed in detail.

Published
2018
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