Bio-inspired design of hierarchical PDMS microstructures with tunable adhesive superhydrophobicity

Nanoscale
Enshuang ZhangYuyan Liu

Abstract

In this paper, bio-inspired PDMS films with different hierarchical microstructures were designed and tunable adhesive super-hydrophobicity was achieved on these films. The adhesive forces between a water droplet and the PDMS film can be adjusted from extremely low (about 8.3 μN) to very high (about 57 μN), and the tunable effect can be ascribed to different wetting states for the water droplets that result from different microstructures on the films. Noticeably, the obtained super-hydrophobic surfaces are acid/alkali-resisting, and water droplets with different pH values have similar contact angles and adhesive forces on the same surface. Finally, the application of the obtained surfaces for microdroplet transportation and self-cleaning are also discussed. The results reported herein provide a new method to obtain super-hydrophobic surfaces with controlled adhesion, and significantly improve our understanding of the relationship between surface adhesion, surface microstructures and the fabrication principle of tunable adhesive super-hydrophobic surfaces.

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Citations

Sep 15, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Yizhou ShenTao Wang
Jun 23, 2015·Angewandte Chemie·Panos DatskosJaswinder Sharma
Jun 9, 2016·ACS Applied Materials & Interfaces·Hongmiao TianYucheng Ding
Oct 23, 2019·Soft Matter·Saumyadwip BandyopadhyaySuman Chakraborty
Aug 28, 2015·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Enshuang ZhangLi Li
Dec 17, 2020·Polymers·Duan-Yi GuoTsung-Hsien Lin
Feb 16, 2018·Journal of Agricultural and Food Chemistry·Yao LiMingqian Tan
Nov 3, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Shasha QiaoXi-Qiao Feng
Apr 17, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pei ChenQuan Xu

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