Wrapping with a splash: High-speed encapsulation with ultrathin sheets
Wrapping with a splash: High-speed encapsulation with ultrathin sheets
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DOI：
10.1126/science.aao1290
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发表时间：
2018-02-16
期刊：
影响因子：
56.9
通讯作者：
Menon, Narayanan
中科院分区：
文献类型：
--
作者：
Kumar, Deepak;Paulsen, Joseph D.;Menon, Narayanan
许多复杂流体依赖于表面活性剂来容纳、保护或隔离不混溶连续相中的液滴。薄弹性片可以在毛细力驱动的自发过程中包裹液滴。为了使薄片封装切实可行，快速、连续且可扩展的工艺至关重要。我们利用液滴撞击的快速动力学来实现在水相中通过聚合物膜包裹油滴。尽管飞溅事件的暴力，该过程稳健地产生最佳形状的包装，以最大化封闭的流体体积，并具有近乎完美的接缝。我们实现了目标的三维（3D）形状的包装，通过裁剪的2D边界的电影和显示的一般性的技术，通过生产水包油和油包水包装。
Many complex fluids rely on surfactants to contain, protect, or isolate liquid drops in an immiscible continuous phase. Thin elastic sheets can wrap liquid drops in a spontaneous process driven by capillary forces. For encapsulation by sheets to be practically viable, a rapid, continuous, and scalable process is essential. We exploit the fast dynamics of droplet impact to achieve wrapping of oil droplets by ultrathin polymer films in a water phase. Despite the violence of splashing events, the process robustly yields wrappings that are optimally shaped to maximize the enclosed fluid volume and have near-perfect seams. We achieve wrappings of targeted three-dimensional (3D) shapes by tailoring the 2D boundary of the films and show the generality of the technique by producing both oil-in-water and water-in-oil wrappings.