杰纳斯
电荷(物理)
微流控
表面电荷
杰纳斯粒子
纳米技术
材料科学
表面改性
化学物理
俘获
电荷密度
联轴节(管道)
曲面(拓扑)
化学
物理
复合材料
几何学
数学
物理化学
生物
生态学
量子力学
作者
Qiangqiang Sun,Xuanming Hu,Boran Xu,Shiji Lin,Xu Deng,Shaobing Zhou
标识
DOI:10.1002/advs.202204382
摘要
The ability to control the mobility and function of droplets is fundamental to developing open surface microfluidics. Despite notable progress in the manipulation of droplets, the existing strategies are still limited in functionalizing droplets. Herein, the coupling of droplet motion and functionalization elicited by an invisible charge wall is reported. The charged superamphiphobic surface is overlapped with a conductor to induce free charge, creating the invisible charge wall at the overlapping boundary. The charge wall can trap droplets and polarize them into Janus charged state. It is found that the trapping degree and the charge distribution in the Janus charged droplet depend on the original surface charge on the superamphiphobic surface. The invisible charge wall can also be established at diverse boundary curvatures, allowing to design pathways for droplet manipulations. Furthermore, the enrichment of protein and nanomaterial in the manipulated Janus charged droplet is demonstrated. The strategy provides a potential microfluidic platform with orthogonal functionalities.
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