Journal
SMALL
Volume 15, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201902360
Keywords
droplet manipulation; micropatterns; programmable liquid adhesion; re-entrant structures; superrepellent
Categories
Funding
- National Key Research and Development Program of China [2017YFA0700500]
- National Natural Science Foundation of China [21635001, 21327902, 51628102]
- 111 Project (Ministry of Education of China) [B17011]
- Natural Science Foundation of Jiangsu [BK20180408]
- Key Research and Development Plan of Jiangsu Province [BE2016002]
- Project of Special Funds of Jiangsu Province for the Transformation of Scientific and Technological Achievements [BA2015067]
- China Postdoctoral Science Foundation [BX20180061]
- Fundamental Research Funds for the Central Universities [2242019R20007]
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Surfaces combining antispreading and high adhesion can find wide applications in the manipulation of liquid droplets, generation of micropatterns and liquid enrichment. To fabricate such surfaces, almost all the traditional methods demand multi-step processes and chemical modification. And even so, most of them cannot be applied for some liquids with extremely low surface energy. In the past decade, multiply re-entrant structures have aroused much attention because of their universal and modification-independent antiadhesion or antipenetration ability. Unfortunately, theories and applications about their liquid adhesion behavior are still rare. In this work, inspired by the springtail skin and gecko feet in the adhered state, it is demonstrated that programmable liquid adhesion is realized on the 3D-printed micro doubly re-entrant arrays. By arranging the arrays reasonably, three different Cassie adhesion behaviors can be obtained: I) no residue adhesion, II) tunable adhesion, and III) absolute adhesion. Furthermore, various arrays are designed to tune macro/micro liquid droplet manipulation, which can find applications in the transportation of liquid droplets, liquid enrichment, generation of tiny droplets, and micropatterns.
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