4.7 Article

Energetic nanoarray structures by confined crystallization for enhanced energy-release efficiency

期刊

CHEMICAL ENGINEERING JOURNAL
卷 403, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126408

关键词

Nanoarrays; Energetic materials; Confined crystallization; Combustion; Energy release

资金

  1. National Natural Science Foundation of China [21875229, 21875232, 51703211, 11702267]

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The study investigates novel nanoarray-structured energetic materials prepared via freeze-drying confined crystallization method, showing improved performance, reduced sensitivity, and higher combustion efficiency compared to conventional energetic crystals.
For energetic materials (EMs), the crystal morphology, particle size and surface state have significant effects on their properties. Nano-sized EMs have attracted considerable research interests during the past decades because of their improved performances in ignition, combustion, and energy-release rate. In this work, several novel nanoarray-structured EMs have been prepared by a facile freeze-drying confined crystallization method, which is based on the self-assembly of materials during rapid recrystallization. The effects of reaction conditions on the morphology and structure of these EMs have been comprehensively studied using state-of-the-art techniques. Thermal decomposition kinetics was obtained from DSC data by Kissinger method. The mechanical sensitivity, ignition and combustion in a chamber with fixed volume were conducted. Such energetic crystal nanoarrays show typical one-dimensional morphology, with long aspect ratio and large specific surface area, some of which also have a distinctive fractal structure. Sensitivity results confirmed the visibly reduced impact and friction sensitivity of the energetic nanoarrays. Compared with normal energetic crystals, these as-prepared nanoarrays exhibited lower onset thermal decomposition temperature, higher ignition efficiency, and better combustion performance, particularly for the nanoarray of two-component composites containing both fuel and oxidizer.

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