期刊
ADVANCED MATERIALS
卷 30, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706657
关键词
Cassie-Baxter state; Cassie-impregnating state; nanoridges; polyolefins; Wenzel state; wetting transitions
类别
资金
- Office of Naval Research [N00014-17-1-2482]
- National Science Foundation [CMMI-1462633]
- State of Illinois
- NSF-MRSEC
- MRSEC [DMR-1121262]
- BK-21 Plus program
- Ryan Fellowship
- Northwestern University International Institute for Nanotechnology
- Northwestern University
This paper describes polymeric nanostructures with dynamically tunable wetting properties. Centimeter-scale areas of monolithic nanoridges can be generated by strain relief of thermoplastic polyolefin films with fluoropolymer skin layers. Changing the amount of strain results in polyolefin ridges with aspect ratios greater than four with controlled feature densities. Surface chemistry and topography are demonstrated to be able to be tailored by SF6-plasma etching to access multiple wetting states: Wenzel, Cassie-Baxter, and Cassie-impregnating states. Reversible transitions among the wetting states can be realized in a programmable manner by cyclic stretching and reshrinking the patterned substrates without delamination and cracking.
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