Thermogravimetric analysis and differential scanning calorimetry for investigating the stability of yellow smoke powders

Tabacof, Adam; Calado, Verônica

doi:10.1007/s10973-016-5876-x

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…According to Table 6, the thermal weight loss ratio M L1 corresponding to P1 at this stage is the largest. In combination with the previous research results of this kind of mixed agent [34], it can be considered that the redox reaction between the combustible agent and the oxidant has occurred in this stage. The peak value of P1 s curve is the largest, and the thermal weight loss ratio is the largest, which is caused by the violent reaction between the combustible C 12 H 22 O 11 and the oxidant KClO 3 at this stage.…”

Section: Tg-dtg Analysis Of the Samplessupporting

confidence: 60%

Effect of 5-Amino-1H-Tetrazole on Combustion Pyrolysis Characteristics and Kinetics of a Combustion Tear Gas Mixture

2022

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Taking the combustion tear gas mixture as the research object, the system formula was optimized by adding a different mass fraction of 5-amino-1H-tetrazole(5AT). TG-DSC, a thermocouple, and a laser smoke test system were used to characterize the characteristic combustion parameters such as combustion temperature and velocity, as well as the end-point effects such as smoke concentration and particle size. Starink’s method, the Flynn–Wall–Ozawa method, and the Coats–Redfern method were used to evaluate the pyrolysis kinetic parameters of the samples. The results show that when the mass fraction of 5-amino-1H-tetrazole in the system is 10%, the maximum combustion temperature of the sample decreases by nearly 70 °C and the smoke concentration increases by 12.81%. The kinetic study also found that with a different mass fraction of 5-amino-1H-tetrazole in the system, the main reaction model of the mixed agent in the first, third, and fourth stages of pyrolysis changed significantly, but for the second stage of sample pyrolysis, the main reaction model (the A4 model) showed a high degree of consistency, which can be considered as the thermal diffusion stage of the tear agent capsicum oleoresin (OC) (the temperature range is 220~350 °C), which is highly consistent with the results of the TG-DSC analysis. It was also confirmed that OC’s thermal diffusion is mainly concentrated in this stage. The results of this study show that adding an appropriate amount of the combustible agent 5-amino-1H-tetrazole to the combustion tear gas mixture can improve its combustion performance and smoking performance, which provides an important, new idea for the development of a new generation of safe, efficient, and environmentally friendly tear gas mixtures.

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Section: Tg-dtg Analysis Of the Samplessupporting

confidence: 60%

Effect of 5-Amino-1H-Tetrazole on Combustion Pyrolysis Characteristics and Kinetics of a Combustion Tear Gas Mixture

2022

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“…Thermal gravimetric analysis (TGA) was performed using a TGA Q50 Thermo-gravimetric analyzer (TA Instruments, USA) to evaluate sample’s thermal stability and physico-sorbed water evolution. Approximately 5 mg of sample was scanned from ambient (approximately 30 °C) to 800 °C at 10 °C min −1 with Al 2 O 3 as a reference 32 for TGA.…”

Section: Methodsmentioning

confidence: 99%

Effect of storage age and containers on the physicochemical degradation of guggul oleo-resin

Thomas,

Tripathi,

Eappen

et al. 2023

Sci Rep

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Guggul is a gum oleo-resin, tapped from a data deficient plant- Commiphora wightii (Arnott.) Bhandari in India. It is extensively used in ayurvedic drugs and formulations since ages. Natural plant-based products; especially aromatic ones like guggul gum oleo-resin deteriorates, qualitatively during its storage and transits before reaching the industry for its value addition. This economical and ecological loss can be avoided if it is stored in proper containers. Physico-chemical degradation of guggul samples stored were analysed by scanned electron microscopy, fourier transformed infra red, thermogravimatric, Powdered X-ray diffraction and elemental analysis for carbon, hydrogen, nitrogen and sulphur. Physico-chemical degradation of guggul oleo-resin occurs with the age of storage and the type of storage containers used. Among the four storage containers (earthen pot, plastic jar, polythene bag, jute bag) evaluated, earthen pot was found to be the best in checking the qualitative loss of guggul even upto 24 months. The qualitative information generated in the study on guggul storage may be useful to the drug industry and guggul traders. It may encourage them practice storing guggul in earthen pots against current practice of using jute bags and polythene bags, to store it.

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“…Thermogravimetric analysis is efficiently used in all numerous studies [1][2][3][4][5][6][7][8]. Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) of NC raw materials and mixtures used in the production of pyrotechnical firecrackers, guns, and other units were monitored under different conditions and in various processes of mixing in air [20]. It was found by TG and DSC that the temperature of the environment used for drying the initial mixture, the high relative moisture content, and granulation did not induce self-ignition.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of denitration of nitrocellulose by microbiological treatment for industrial waste effluents using calorimetry analysis

Саратовских

Авдеева

Yarullin

et al. 2018

J Therm Anal Calorim

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The problem of utilization of the compounds present in the effluents of the production of cellulose nitrates (NC) is very important and complicated, and its decision is inextricably related to the environment. The process of heat release in the samples of nitrocellulose subjected to biological processing of different types was studied. Biological processing was conducted by incubation with sulfate-reducing bacteria Desulfovibrio desulfuricans BRMB-1388, microscopic fungi Fusarium solani BKM F-819, and their mixed culture. The studies were carried out on the native NC (13.38% nitrogen) and the NC processed (NC proc ) using ultraviolet radiation and ozone (UV ? ozone). It has been shown that the pretreatment of the NC by UV ? ozone significantly increases the degree of decomposition of the NC during its subsequent biodegradation assisted by symbiotic microorganisms of D. desulfuricans and F. solani. A substantial result was achieved on the fifth day of NC proc incubation, which is promising from the viewpoint of practical applications.

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Thermogravimetric analysis and differential scanning calorimetry for investigating the stability of yellow smoke powders

Cited by 8 publications

References 26 publications

Effect of 5-Amino-1H-Tetrazole on Combustion Pyrolysis Characteristics and Kinetics of a Combustion Tear Gas Mixture

Effect of 5-Amino-1H-Tetrazole on Combustion Pyrolysis Characteristics and Kinetics of a Combustion Tear Gas Mixture

Effect of storage age and containers on the physicochemical degradation of guggul oleo-resin

Evaluation of denitration of nitrocellulose by microbiological treatment for industrial waste effluents using calorimetry analysis

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