期刊
ADVANCED MATERIALS INTERFACES
卷 7, 期 10, 页码 -出版社
WILEY
DOI: 10.1002/admi.202000161
关键词
droplet-manipulating materials; droplet manipulation; ethanol-wetted nanofibrils wires; repellent effect; split droplets
A strategy of droplet manipulation is introduced, that is, an ethanol-wetted nanofibrils wire (ENW) that can smartly generate a repellent force to cut apart a spreading water droplet to split droplets (SDs) on a superhydrophilic surface without any contact. The repellent force is attributed to a unique Marangoni state inside droplet due to the interaction between vapor-liquid interfaces, along with the gradient surface tension formed between the ENW and spreading droplet. It is demonstrated that such an ENW makes an as-spreading water droplet with volume of 5-25 mu L to be accurately cut apart into tiny SDs in various proportions (e.g., 1/9-1/1) without loss, and the minimum SD can be 1.7 mu L in volume. A spreading droplet can be one-step cut apart into patterns and further some micro-reactors can be achieved by using ENW manipulations, respectively. This finding offers insights into the design of novel droplet-manipulating materials that can be extended into microfluidics, microreactors, and others.
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