期刊
ADVANCED SCIENCE
卷 9, 期 33, 页码 -出版社
WILEY
DOI: 10.1002/advs.202204382
关键词
droplet manipulation; electrostatic induction; superhydrophobic; surface charge
资金
- National Natural Science Foundation of China [22105161]
- Fundamental Research Funds for the Central Universities [2682021CX104]
This study reports a method of manipulating droplet motion and functionalization using an invisible charge wall. The invisible charge wall can trap droplets and polarize them into charged states. Furthermore, the enrichment of proteins and nanomaterials in the manipulated charged droplets is demonstrated. This strategy provides a potential microfluidic platform with orthogonal functionalities.
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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