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首页> 外文期刊>Advanced Materials >Controllable Microfluidic Production of Microbubbles in Water-in-Oil Emulsions and the Formation of Porous Microparticles
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Controllable Microfluidic Production of Microbubbles in Water-in-Oil Emulsions and the Formation of Porous Microparticles

机译：油包水型乳液中微泡的可控微流产和多孔微粒的形成

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We report the formation of micrometer-diameter water droplets, in a continuous oil phase, where each droplet encapsulates a discrete number of gas bubbles. The approach combines two different microfluidic geometries: flow-focusing and a T-junction (Fig. 1). In particular, monodisperse microbubbles were first generated in a continuous water phase using a flow-focusing geometry, after which the gas-water system was dispersed into a continuous oil phase either by a flow-focusing or a T-junction element so as to obtain water drops that contain individual gas bubbles. The generation of water-encapsulated microbubbles in both geometries is dependent on the flow rates of the two liquids, and it is less sensitive to the gas pressure in the double flow-focusing geometry (DFF; Fig. 1c and d) than in the geometry with flow-focusing followed by a T-junction (FFT; Fig. la and b). Moreover, the DFF was able to form a relatively thin water layer encapsulating individual microbubbles while the FFT, on the other hand, had the advantage of controlling of the number of bubbles per water droplet. We illustrated this characteristic feature of FFT using an aqueous photopolymer-izable acrylamide solution and fabricated monodisperse porous polyacrylamide particles with relatively low elastic moduli compared with solid polyacrylamide particles. These ideas provide an avenue for systematically controlling gas-liquid microstructures of double-emulsion type and offer a new fabrication method for polymer-covered microbubbles and porous microparticles.
机译：我们报告了在连续油相中形成直径为微米的水滴，其中每个水滴封装了离散数量的气泡。该方法结合了两种不同的微流体几何形状：流动聚焦和T型结（图1）。特别地，首先使用流动聚焦几何结构在连续水相中产生单分散微泡，然后通过流动聚焦或T形结元件将气-水体系分散成连续油相，从而获得包含单个气泡的水滴。在两种几何形状中，水包裹的微气泡的产生都取决于两种液体的流速，并且在双流聚焦几何形状（DFF；图1c和d）中，它对气体压力的敏感性低于几何形状流动聚焦之后是T型结（FFT；图1a和b）​​。此外，DFF能够形成一个相对较薄的水层，将单个微气泡包裹起来，而FFT的另一优势是可以控制每个水滴的气泡数。我们举例说明了使用可光聚合的丙烯酰胺水溶液的FFT的这一特征，并制造了与固态聚丙烯酰胺颗粒相比具有较低弹性模量的单分散多孔聚丙烯酰胺颗粒。这些想法为系统地控制双乳液型气液微结构提供了途径，并为聚合物覆盖的微泡和多孔微粒提供了一种新的制备方法。

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