Mechanism of Microfluidic Properties on Nano-Hexanitrostilbene Droplet Generation
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摘要:为探究微流体特性对纳米六硝基茋（Hexanitrostilbene，HNS）液滴生成过程的影响及其对微球粒径分布的作用机制，采用共轴聚焦流液滴制备技术，并结合实时动态监测手段，通过控制变量法深入分析了微流体特性对纳米六硝基茋液滴生成模式、频率及尺寸的影响，进而揭示了滴流、射流及不稳定射流的微观特征对HNS微球粒径分布的作用。研究发现，相较于不稳定射流模式，在滴流和射流模式下制备的纳米HNS微球具有更优的单分散性。基于两相流量、连续相粘度以及分散相固含量对液滴生成特性的定量影响规律，本研究实现了对微球制备粒径（233.0 ~515.8 μm）和生成频率（5.8 ~ 188.7 Hz）的精确控制，为含能微球的制备提供了实验基础和理论支持。
Abstract:Aimed to explore the influence of microfluidic properties on the droplet generation process of nano- hexanitrostilbene (HNS) and its mechanism in regulating the particle size distribution of microspheres, using coaxial flow - focusing droplet generation technology combined with real - time monitoring, the influence of microfluidic properties on HNS droplet formation modes, frequency, and size was analyzed by controlled - variable experiments. Furthermore, the microscopic characteristics of dripping, jetting, and unstable jetting modes influencing on the particle size distribution of HNS microspheres were revealed. Experimental results demonstrate that nano-HNS microspheres prepared under dripping and jetting modes exhibite superior monodispersity compared to those generated under unstable jetting conditions. Based on quantitative analyses of the impact of two-phase flow rates, continuous-phase viscosity, and dispersed-phase solid content on droplet generation dynamics, precise control over the microsphere size range (233.0~515.8 μm) and generation frequency (5.8~188.7 Hz) is achieved, which provides experimental evidence and theoretical support for the fabrication of energetic microspheres.
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