scholarly journals Investigating the Kinetics of the Thermolysis of 3-nitro-2,4-dihydro-3H-1,2,4-triazol-5-one (NTO) and Reduced Size NTO the Presence of Cobalt Ferrite Additive

2021 ◽  
Author(s):  
pragnesh N Dave ◽  
Ruksana Sirach ◽  
Riddhi Thakkar ◽  
M P Deshpande
Keyword(s):  
Thermal Decomposition ◽  
Energetic Materials ◽  
Cobalt Ferrite ◽  
Simultaneous Thermal Analysis ◽  
Isoconversional Methods ◽  
Decomposition Temperature ◽  
Precipitation Method ◽  
Thermal Decomposition Temperature ◽  
Highly Sensitive ◽  
Co Precipitation

Abstract Less sensitive high energetic materials (HEMs) are explored as a potential replacement of highly sensitive HEMs in propellants, and explosive applications. More research have been devoted to improve the thermal decomposition of such a less sensitive HEMs. Nanosize Cobalt ferrite (CoF) has been successfully synthesized using the co-precipitation method. Synthesis of less sensitive HEM 3-nitro-2,4-dihydro-3H-1,2,4-triazol-5-one(NTO) and its size reduction using solvent-antisolvent method is successfully achieved. Effect of 5 % by weight CoF on the thermolysis of NTO and NTO with reduced size (r-NTO) has been studied using the simultaneous thermal analysis. Three isoconversional methods namely Flynn Ozawa Wall, Kissinger-Akahira-Sunose (KAS), and Starink are employed to evaluate the kinetic parameter of NTO, and r-NTO in the presence of CoF additive. It was found that both the addition of CoF as well as reducing size of NTO can decrease the thermal decomposition temperature of NTO, the later decreasing the thermal decomposition temperature to a good extent compared to former. However, the kinetic study using isoconversional methods suggested that in the presence of CoF additive, the activation energy of both NTO as well as n-NTO is increased.

Effect of Nano-CuO on Luminous Intensity of Pyrotechnics Composite Containing KClO4 and Al

2012 ◽  
Vol 217-219 ◽  
pp. 669-672
Author(s):  
Shu Hong Ba ◽  
Zhe Zhang ◽  
Ming Hui Yan ◽  
Zhe Xing Sun ◽  
Xin Peng Teng
Keyword(s):  
Thermal Decomposition ◽  
Spherical Shape ◽  
Decomposition Temperature ◽  
Luminous Intensity ◽  
Precipitation Method ◽  
Thermal Decomposition Temperature ◽  
Direct Precipitation ◽  
Analysis Instrument ◽  
Average Size ◽  
Direct Precipitation Method

Nano-CuO had been successfully synthesized by using direct precipitation method. The prepared sample was characterized by XRD. The luminous intensities of pyrotechnics composite containing KClO4, Mg and nano-CuO were measured. The catalysis of CuO nanocrystal on KClO4 was investigated by thermal analysis instrument. The results show that the average size of nano-CuO is 19 nm and has spherical-shape. When nano-CuO is added into the pyrotechnics composites containing KClO4 and Al, it can improve the igniting and burning performance. The luminous intensity of trinary pyrotechnics composite is also greatly increased. On the other hand, nano-CuO can make thermal decomposition temperature of KClO4 to decrease 97.7 °C, the decalescence amount also reduced to 79.07 J/g. It is obviously that nano-CuO has strong catalysis to KClO4 thermal decomposition. The conclusion is consistent with the measure results of luminous intensity.

Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method

2010 ◽  
Vol 322 (21) ◽  
pp. 3470-3475 ◽  
Author(s):  
Yue Zhang ◽  
Zhi Yang ◽  
Di Yin ◽  
Yong Liu ◽  
ChunLong Fei ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cobalt Ferrite ◽  
Nano Particles ◽  
Precipitation Method ◽  
Co Precipitation

Preparation of Magnesium Carbonate Whisker by Using Magnesite Tailings

2010 ◽  
Vol 654-656 ◽  
pp. 2022-2024
Author(s):  
Nan Wang ◽  
Yue Yuan Li ◽  
Hong Wei Ni
Keyword(s):  
Thermal Decomposition ◽  
Aspect Ratio ◽  
Magnesium Carbonate ◽  
Decomposition Temperature ◽  
Magnesium Salt ◽  
Thermal Decomposition Temperature ◽  
Stirring Intensity

Magnesium carbonate whisker was prepared by thermal decomposition of Mg(HCO3)2 solution that was prepared through hydration and carbonation of light burnt magnesia derived from magnesite tailings. The effects of thermal decomposition conditions on the morphology of magnesium carbonate crystal were investigated. Magnesium carbonate whiskers were successfully prepared when a kind of soluble magnesium salt was added, and magnesium carbonate whiskers with the length of 20 to 60μm and aspect ratio of 10~20 were obtained under the condition of 50 °C thermal decomposition temperature and 200 rpm stirring intensity.

Measurement of Thermal Decomposition Temperature and Rate of Sodium Hydride

2020 ◽  
Author(s):  
Munemichi Kawaguchi
Keyword(s):  
Thermal Decomposition ◽  
Mass Loss ◽  
Heating Temperature ◽  
Fission Products ◽  
Sodium Hydride ◽  
Decomposition Temperature ◽  
Cold Trap ◽  
Thermal Decomposition Temperature ◽  
Heating Rates ◽  
Fundamental Research

Abstract In decommissioning sodium-cooled fast reactors, the operators can be exposed to radiation during dismantling of cold trap equipment (C/T). The C/T is higher dose equipment because the C/T trapped tritium of fission products during the operation to purify the sodium coolant. In this study, thermal decomposition temperature and rate of sodium hydride (NaH) were measured as a fundamental research for development of “thermolysis” process prior to the dismantling. We measured the thermal decomposition temperature and rate using NaH powder (95.3%, Sigma-Aldrich) in alumina pan with ThermoGravimetry-Differential Thermal Analysis (TG-DTA) instrument (STA2500 Regulus, NETZSCH Japan). The heating rates of TG-DTA were set to β = 2.0, 5.0, 10.0 and 20.0 K/min. The DTA showed endothermic reaction and the TG showed two-steps mass-loss over 580K. This first-step mass-loss was consistent with change of chemical composition of the NaH with heating (NaH → Na+1/2H2). The thermal decomposition temperature and rate were obtained from the onset temperature of the mass-loss and the simplified Kissinger plots, respectively. Furthermore, we set to the thermal decomposition temperature of around 590K, and the mass-loss rates were measured. As a result, over 590K, the thermal decomposition occurred actively, and showed good agreement with the estimation curves obtained by the simplified Kissinger plots. The thermal decomposition rate strongly depended on the heating temperature.

Effect of Co(NO3)2·6H2O thermal decomposition temperature on the nano-Co3O4 product morphology and electrocatalysis of water oxidation

2019 ◽  
Vol 49 (3) ◽  
pp. 251-259 ◽  
Author(s):  
Mohammed Ameen Ahmed Qasem ◽  
Abuzar Khan ◽  
Sagheer A. Onaizi ◽  
Hatim Dafalla Mohamed ◽  
Aasif Helal ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Water Oxidation ◽  
Decomposition Temperature ◽  
Thermal Decomposition Temperature ◽  
Product Morphology
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