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Measurement of Solubility, Metastable Zone and Induction Period of ADN
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1.State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2.Xi′an Modern Chemistry Research Institute, Xi′an 710065, China;3.School of Chemistry and Chemical Engineering, Qinghai Nationalities University, Xining 810007, China

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    Abstract:

    Solubility, metastable zone width and induction period are important parameters in the crystallization process of ammonium dinitramide(ADN). The solubilities of ADN in n-butanol, isopropanol and mixed solvent of water and isopropanol (volume ratio as 1∶10 and 1∶6) were measured by dynamic method and the solubility data were fitted by Apelblat equation and λh equation, respectively. The effects of stirring speed and cooling rate on the metastable zone width of ADN in n-butanol and isopropanol and the effects of different supersaturation on the induction period were investigated, respectively. Results show that the Apelblat equation and the λh equation can well fit the solubility of ADN. With the decrease of the cooling rate and the increase of the stirring speed, the width of the crystalline metastable zone narrows. The crystallization induction period shortens with the increase of supersaturation. Using the self-consistent Nývlt equation and 3D nucleation theory, combined with the metastable zone width and induction period data, the nucleation order m is calculated to be about 4, and the solid-liquid interfacial tension of ADN in n-butanol and isopropanol are 0.235 mJ·m-2 and 0.191 mJ·m-2 for homogeneous nucleation, 0.070 mJ·m-2 and 0.067 mJ·m-2 for heterogeneous nucleation, respectively.

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刘欣玉,孙杰,罗义芬,等. ADN的溶解度、结晶介稳区及诱导期的测定[J].含能材料,2019,27(9):766-772.
LIU Xin-yu, SUN Jie, LUO Yi-fen, et al. Measurement of Solubility, Metastable Zone and Induction Period of ADN[J]. Chinese Journal of Energetic Materials,2019,27(9):766-772.

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History
  • Received:September 19,2018
  • Revised:March 17,2019
  • Adopted:December 24,2018
  • Online: March 04,2019
  • Published: September 27,2019