期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 2, 页码 3454-3462出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20546
关键词
vapor effect; Marangoni effect; superlyophilic substrate; self-shrinkage; liquid collection; microfluidics
资金
- National Key R&D Program of China [2018YFA0208501]
- National Nature Science Foundation of China [51803217, 51773206, 91963212, 51961145102, 22002171]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-202005, 2019BMS20003]
- K. C. Wong Education Foundation
- China Postdoctoral Science Foundation [2020M670466]
This study demonstrates a new method of self-shrinkage of droplets induced by specific vapors for efficient liquid collection and flexible droplet reactions. The research findings show that under specific vapor environments, self-shrinking droplets exhibit reversible responsiveness, high mobility, and autocoalescence, which can be used for liquid collection on superlyophilic substrates.
Liquid manipulation on solid surfaces has attracted a lot of attention for liquid collection and droplet-based microfluidics. However, manipulation strategies mainly depend on chemical modification and artificial structures. Here, we demonstrate a feasible and general strategy based on the self-shrinkage of the droplet induced via specific vapors to efficiently collect liquids and flexibly carry out droplet-based reactions. The vapor-induced self-shrinkage is driven by Marangoni flow originating from molecular adsorption and diffusion. Under a specific vapor environment, the self-shrinking droplet exhibits unique features including reversible responsiveness, high mobility, and autocoalescence. Accordingly, by building a specific vapor environment, the thin liquid films and random liquid films on superlyophilic substrates can be recovered with a collection rate of more than 95%. Moreover, the vapor system can be used to construct a high-efficiency chemical reaction device. The findings and profound understandings are significant for the development of the liquid collection and droplet-based microfluidics.
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