• Title/Summary/Keyword: Barium chromate

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The Combustion Mechanism of Tungsten-potassium Perchlorate-barium Chromate Delay power ($W/KClO_4/BaCrO_4$ 지연제의 연소 메카니즘)

  • Nakamura, Hidesugu;Akiyoshi, Miyako;Hara, Yasutake
    • Explosives and Blasting
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    • v.18 no.1
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    • pp.53-58
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    • 2000
  • Thermal analysis, analysis of combustion residue and combustion characteristics measure ment such as burning rate or temperature were carried out to clarify the combustion mechanism of a tungsten- potassium perchlorate-barium chromate chromate delay powder. The results obtained are as follows. The main reaction of the delay powder of tungsten-potassium perchlorate-barium chromate is the oxidation of tungsten by potassium perchlorate. Barium chromate acts as a burning rate modifier, and the smaller the larger is the burning rate. Three types of delay composition used in this study show characteristic burning behavior. A stoichiomertric or a oxidizer-rich composition has a small linear burning rate. although it is has a large heat of combustion. On the other hand, a tungsten-excess or a fuel-rich composition with a small heat of combustion has a larger linear burning rate than the former, showing a small fractional oxidation of tungeten (below 10%) contained in the delay powder. From these results, a surface combustion mechanism is proposed for the combustion mechanism of this delay powder.

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Assembling Synthesis of Barium Chromate Nano-superstructures Using Eggshell Membrane as Template

  • Liu, Jin-Ku;Wu, Qing-Sheng;Ding, Ya-Ping;Yi, Yu
    • Bulletin of the Korean Chemical Society
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    • v.25 no.12
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    • pp.1775-1778
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    • 2004
  • The branch-like, feather-like $BaCrO_4$ nano-superstructures were synthesized with bioactive eggshell membrane as directing and assembly template. Studies on the two products revealed that they formed through the self-assembly of nanoparticles, and that the optical properties of the products were different from $BaCrO_4$ bulk materials.

Determination of sulfur containing organic drugs by means of thin layer chromatography and flask combustion method (Thinlayer chromatography및 oxygen combustion flask method에 의한 유기유황약품의 분리정량)

  • 백남호;김박광
    • YAKHAK HOEJI
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    • v.13 no.2_3
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    • pp.84-87
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    • 1969
  • Microanalysis of organic sulfur compounds by means of combining thin layer chromatography and oxygen combustion flask method was attempted. The following procedure was found to be very simple and to give accurate results. The mixture of sulfa drugs was separated with T.L.C., and it was burned in a flask filled with oxygen, and the gas formed was absorbed in a dilute solution of sodium hydroxide. The solution was neuralized with hydrochloric acid and heated in a water bath. The sulfate ion formed was then treated with barium chromate solution and its absorbancy at 370 m.mu. was measured.

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