Effect of Jet Instability on the Preparation of Nitrocellulose Microspheres by Flow Focusing
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摘要:为通过微流控技术获得良好形貌特性的硝化棉微球，以硝化棉的乙酸乙酯溶液为研究对象，探究了流动聚焦微流控芯片中硝化棉/乙酸乙酯水包油液滴的生成机制，详细研究了在滴流、稳定射流、不稳定射流3种流动模式下，连续相、分散相流量以及界面张力等对微液滴生成的影响，并在3种流动模式下制备硝化棉微球。结果表明：滴流和稳定射流模式下制备的微球呈单分散、高度球形化、窄粒径分布特性；不稳定射流模式下制备的微球高度球形化，粒径分布较滴流和稳定射流下的宽。
Abstract:To obtain nitrocellulose microspheres with good morphology features by microfluidic technology, taking the ethyl acetate solution of nitrocellulose as the research object, the formation mechanism of nitrocellulose / ethyl acetate water-in-oil droplets in flow focusing microfluidic chip was investigated. The effects of continuous phase flow, dispersion phase flow and interfacial tension on the formation of microdroplets were studied in detail under three flow regimes, including dripping flow, stable jetting, unstable jetting . And nitrocellulose microspheres were prepared by the three flow regimes. The results show that the microspheres prepared by dripping flow and stable jetting modes have characteristics of monodisperse, highly spheroidal and narrow particle size distribution, while the microspheres prepared by unstable jetting regime are highly spherical and the particle size distribution is wider than that in dripping flow and stable jetting regime.
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