Controllable preparation of hexanitrostilbene (HNS) microspheres with multi-cavity structure to enhance safety and combustion performance

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-10-24 DOI:10.1016/j.powtec.2024.120397

Yi Liu, Yunyan Guo, Jiafei Li, Kai Han, Chongwei An, Zhongliang Ma, Bidong Wu

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Abstract

Controlling the structure to meet the demand for high-energy, low-sensitivity energetic materials in modern military and civilian applications is an effective method. In this study, hexanitrostilbene (HNS) microspheres with a multi-cavity structure were prepared using nitrocellulose (NC) and fluororubber (F₂₆₀₄) as binders via microjet droplet technology. The effects of flow rate, receiving liquid temperature, and suspension concentration on the morphology, particle size, and cavity of the HNS microspheres were investigated. Furthermore, the impact of the multi-cavity structure on the microspheres' specific surface area, dispersibility, thermal properties, safety performance, and combustion performance was studied. Results showed that the multi-cavity HNS microspheres retained the raw materials' crystal structure while exhibiting improved dispersibility, higher activation energy, and shorter ignition delay. Moreover, the multi-cavity structure outperformed the solid structure in terms of specific surface area, safety performance, and combustion performance. This study opens up a new direction for the preparation of multi-structured energetic microspheres.

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可控制备具有多腔结构的己酮二苯乙烯（HNS）微球，提高安全性和燃烧性能

控制结构以满足现代军事和民用领域对高能低敏高能材料的需求是一种有效的方法。本研究以硝化纤维素（NC）和氟橡胶（F2604）为粘合剂，通过微喷射液滴技术制备了具有多腔结构的己基二苯醚（HNS）微球。研究了流速、接收液温度和悬浮液浓度对 HNS 微球的形态、粒度和空腔的影响。此外，还研究了多腔结构对微球比表面积、分散性、热性能、安全性能和燃烧性能的影响。结果表明，多空腔 HNS 微球保留了原材料的晶体结构，同时具有更好的分散性、更高的活化能和更短的点火延迟。此外，多空腔结构在比表面积、安全性能和燃烧性能方面都优于固体结构。这项研究为制备多结构高能微球开辟了新的方向。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.

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