Microfluidic Fabrication of Core-Shell Structured Microspheres for Encapsulation of Energetic Materials Simulant

LIU Jing,LYU Ying-di,LIU Jian-hang,YANG Wen-bo,TAO Sheng-yang

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    Published By: Chinese Journal of Explosives & Propellants

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Chinese Journal of Explosives & Propellants ›› 2024, Vol. 47 ›› Issue (6) : 506-512. DOI: 10.14077/j.issn.1007-7812.202403009

Microfluidic Fabrication of Core-Shell Structured Microspheres for Encapsulation of Energetic Materials Simulant

  • LIU Jing1,LYU Ying-di2,3,LIU Jian-hang1,YANG Wen-bo1,TAO Sheng-yang1
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Abstract

Based on a simple droplet microfluidic technology to produce a single emulsion, the core-shell microspheres with 4-nitrobenzaldehyde(p-NBA)as nuclear layer and polystyrene(PS)as shell layer were prepared, combined with phase separation and crystallization solidification. The p-NBA was coated in one step as the analog of 3,4-dinitrotrifluorotoluene(DNTF). The microspheres with different structures and morphologies were obtained by adjusting the ratio of p-NBA, PS and the shaping agent ethyl cellulose(EC). The influence of above factors on the structures of core-shell microspheres was studied. Based on the double conditions of coating passivation effect and coating amount of high energy explosive DNTF, the optimal experimental conditions were obtained when using PS with large molecular weight(Mr=300000—350000): the mass ratio of EC and p-NBA is 1:10, and the mass fraction of PS is 8%. The results show that the addition of excipients can promote the crystallization of p-NBA and allow it to form spherical particles when the droplet phase is separated, then it can be completely coated. The larger the initial mass fraction of PS in the microdroplet, the thicker the shell layer and the higher the sphericity. However, the thicker the shell encapsulated with DNTF, the lower the detonation power.

Key words

physical chemistry / microfluidic / core-shell structure / microspheres / 4-nitrobenzaldehyde(p-NBA) / ethyl cellulose(EC) / DNTF / excipient

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LIU Jing,LYU Ying-di,LIU Jian-hang,YANG Wen-bo,TAO Sheng-yang. Microfluidic Fabrication of Core-Shell Structured Microspheres for Encapsulation of Energetic Materials Simulant. Chinese Journal of Explosives & Propellants. 2024, 47(6): 506-512 https://doi.org/10.14077/j.issn.1007-7812.202403009

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