“一步法”制备双重乳粒过程中乳粒的形成及尺寸调控  

The Formation and Size Control of Emulsion Droplets in the Preparation of Double Emulsion Droplets by One-step Microfluidic Device

作　　者：傅宥铱 张占文[2] 易勇[1] 付真金 FU Youyi;ZHANG Zhanwen;YI Yong;FU Zhenjin(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《西南科技大学学报》2022年第3期7-13,共7页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金(22002145,15703212)。

摘　　要：在惯性约束聚变(ICF)中,需精确控制目标微球前驱体W_(1)/O/W_(2)双重乳粒的几何尺寸。采用“一步法”同轴钢针微通道,研究了W_(1)/O/W_(2)双重乳粒的形成过程和尺寸变化。优化了无中间相液滴工况,得到了基于三相体积流量的流型图;利用高速摄像机研究了W_(1)/O/W_(2)双重乳粒的形成过程,分析了作用在双重乳粒上的受力情况;重点研究了外水相黏度对乳粒几何尺寸的影响:在某特定流速下,外水相黏度分别为1.900,4.952,7.020 mPa·s,乳粒形成时间分别为1.03,0.78,0.56 s,外径分别为3400,2830,2652μm,内径分别为2380,1960,1780μm。研究结果可供聚合物靶材的可控制备参考。In inertial confinement fusion(ICF),it is necessary to have a precise control on the geometric size of W_(1)/O/W_(2)double emulsion droplets which are the precursors for target microsphere.A one-step microfuildic device which was designed and constructed by using a coaxial steel needle to study the formation and the size change of W_(1)/O/W_(2)double emulsion droplets.The mesophase-free droplet condition was optimized,and the flow pattern diagram based on three phase volume flow rate was obtained;the formation process of W_(1)/O/W_(2)double emulsion droplets was studied with a high-speed camera,and the forces acting on the double emulsion droplets were analyzed.Particularly,the influence of the external-phase viscosity on the geometrical size of the emulsion droplets was studied:at a certain flow rate,the viscosity of external phase was 1.900,4.952,7.020 mPa·s,respectively;the formation time of emulsion droplets was 1.03,0.78,0.56 s,respectively;and the outer diameters were 3400,2830,and 2652μm,respectively;the inner diameters are 2380,1960,1780μm,respectively.The results can be used as reference for the controllable preparation of polymer targets.

关 键 词：双重乳粒 微流控技术 乳粒尺寸 外水相黏度 

分 类 号：TB383[一般工业技术—材料科学与工程] O6-339[理学—化学]