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首页> 外文期刊>Crystal growth & design >Perfect Energetic Crystals with Improved Performances Obtained by Thermally Metastable Interfacial Self-Assembly of Corresponding Nanocrystals
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Perfect Energetic Crystals with Improved Performances Obtained by Thermally Metastable Interfacial Self-Assembly of Corresponding Nanocrystals

机译：完美的精力充沛的晶体，具有通过相应纳米晶体的热稳定性界面自组装获得的改进的性能

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摘要

The interfacial self-assembly of energetic nanocrystals was proposed and systematically studied in this work. Effects of the reaction temperature, grain size of nanocrystals, solvent system, and addition of surfactant on the self-assembled crystals were investigated. The morphologies and crystal structures of the self-assembled products were investigated by microscopy analysis and coherence strength tests. Furthermore, the energetic crystals prepared by a thermally metastable self-assembly method were systematically compared with the starting raw crystalline materials and the corresponding crystals prepared by recrystallization, in terms of polymorphic transition behaviors, impact sensitivity, and thermal properties. It has been shown that the energetic crystals synthesized by this novel self-assembly method were uniform with smooth surface and free of defects. These crystals also had very narrow size distribution, ordered crystallographic texture, and high compactness, with significant improvement in impact sensitivity. It is suggested that the polymorphic transition of energetic crystals can be favorable, but it is not essential to reach the thermally metastable state before nanocrystal assembly, resulting in higher thermal stability. The kinetics of the self-assembly process were found to follow the Avrami equation. The possible mechanism of this self-assembly process was also proposed, including, sequentially, solvent induction originated from surface solvation or localized dissolution, particle aggregation, and interfacial crystal growth.
机译：在这项工作中提出和系统地研究了能量纳米晶体的界面自组装。研究了反应温度，纳米晶体，溶剂体系的晶粒尺寸，以及在自组装晶体上添加表面活性剂的影响。通过显微镜分析和相干强度试验研究了自组装产品的形态和晶体结构。此外，通过热稳定的晶体材料和通过重结晶制备的相应晶体，在多态转换行为，冲击灵敏度和热性能方面，系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行系统地进行。已经表明，通过这种新型自组装方法合成的能量晶体具有光滑的表面和不含缺陷的均匀。这些晶体也具有非常窄的尺寸分布，有序的晶体纹理和高紧凑性，影响敏感性显着提高。建议能量晶体的多态转变可以有利，但是在纳米晶体组件之前到达热稳定状态是必需的，导致较高的热稳定性。发现自组装过程的动力学遵循Avrami方程。还提出了这种自组装过程的可能机制，包括依次，源于表面溶解或局部溶解，颗粒聚集和界面晶体生长的溶剂诱导。

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  • 来源
    《Crystal growth & design》 |2018年第3期|共9页
  • 作者

    Zhijian Yang; Feiyan Gong; Guansong He; Yubin Li; Ling Ding; Fude Nie; Fenglei Huang;

  • 作者单位

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China;

    Department of Engineering Mechanics State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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