微流控技术中双重乳粒尺寸调控规律的研究

发布时间：2018-03-29 22:21

本文选题：双重同轴三孔发生器　切入点：两步法　出处：《物理学报》2017年04期

【摘要】：在采用乳液微封装技术制备惯性聚变用聚-α-甲基苯乙烯(PAMS)靶丸芯轴过程中,以氟苯为油相溶剂,水溶性聚合物水溶液为外水相制备水包油包水(W1/O/W2)双重复合乳粒,对复合乳粒进行固化干燥得到PAMS靶丸芯轴.本文设计搭建了一套双重同轴乳粒发生器,用微流控技术产生PAMS靶丸复合乳粒,该乳粒发生器采用两种不同结构:"两步法"通道与"一步法"通道.研究了利用此乳粒发生器制备复合乳粒过程中,乳粒形成机理及三相流速对乳粒尺寸调控规律.实验结果显示,乳粒发生器结构上的细小差异会极大地影响乳粒形成机理以及尺寸变化规律.在"两步法"通道结构中,内水相流速对复合乳粒的形成及外径无明显影响,而外径随外水相流速的变化规律与单乳粒实心液滴(O/W2)尺寸变化规律相同;在固定体系中,乳粒尺寸取决于内水相与油相流速之和及外水相流速,而与内水相和油相流速之比无关.然而在"一步法"通道中,由于W1-O界面的存在,内水相流速对复合乳粒外径的影响非常大;复合乳粒外径不仅与内层相界面的界面张力大小有关,还与内水相与油相流速之比有关.最后,将实验中的双重复合乳粒置于水溶性聚合物水溶液中进行固化,得到毫米级空心聚合物微球.
[Abstract]:In the process of preparing the core axis of poly- 伪 -methylstyrene (PAMS) target for inertial fusion by using emulsion microencapsulation technology, water / oil / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water / water. The core axis of PAMS target was obtained by curing and drying the composite emulsion. In this paper, a set of double coaxial emulsion generator was designed and constructed. The PAMS target compound emulsion was produced by microfluidic technique. There are two different structures used in the emulsion generator: "two-step" channel and "one-step" channel. The mechanism of grain formation and the regulation of three-phase flow rate on the grain size. The experimental results show that the small differences in the structure of the particle generator greatly affect the mechanism of grain formation and the regularity of size change. In the "two-step method" channel structure, The internal water phase flow rate had no significant effect on the formation and outer diameter of the composite emulsion, but the variation of the external diameter with the external water phase velocity was the same as that of the single emulsion solid droplet O / W _ 2. The size of emulsion depends on the sum of the flow rate of internal water phase and oil phase and the flow rate of external water phase, but not on the ratio of internal water phase and oil phase flow rate. However, in the "one-step" channel, due to the existence of W1-O interface, The external diameter of composite emulsion is related not only to the interfacial tension of the inner phase, but also to the ratio of internal water phase to oil phase velocity. The double composite emulsion particles in the experiment were solidified in water soluble polymer aqueous solution to obtain millimeter hollow polymer microspheres.
【作者单位】：中国工程物理研究院激光聚变研究中心;
【基金】：NSAF基金(批准号:U1530260)资助的课题~~
【分类号】：O632.13;O648.2

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