Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 11, Pages 7362-7371Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01869
Keywords
underwater superpolymphobicity; femtosecond laser; polymer repellence; three-level microstructure; superhydrophilicity
Funding
- Bill & Melinda Gates Foundation [OPP1119542]
- US Army Research Office [W911NF1810204]
- National Key Research and Development Program of China [2017YFB1104700, 2018YFB1107202]
- U.S. Department of Defense (DOD) [W911NF1810204] Funding Source: U.S. Department of Defense (DOD)
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A femtosecond (fs)-laser-processed surface that repels liquid polymer in water is reported in this paper. We define this phenomenon as the superpolymphobicity. Three-level microstructures (including microgrooves, micromountains/microholes between the microgrooves, and nanoripples on the whole surface) were directly created on the stainless steel surface via fs laser processing. A liquid polydimethylsiloxane (PDMS) droplet on the textured surface had the contact angle of 156 +/- 3 degrees and contact angle hysteresis less than 4 degrees in water, indicating excellent underwater superpolymphobicity of the fs-laser-induced hierarchical microstructures. The contact between the resultant superhydrophilic hierarchical microstructures and the submerged liquid PDMS droplet is verified at the underwater Cassie state. The underwater superpolymphobicity enables to design the shape of cured PDMS and selectively avoid the adhesion at the PDMS/substrate interface, different from the previously reported superwettabilities. As the examples, the microlens array and microfluidics system were prepared based on the laser-induced underwater superpolymphobic microstructures.
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