In this letter, we report the fabrication of robust and mechanically tunable superhydrophobic surfaces based on elastic wrinkles having bi-modal distribution of roughness. Contrary to most superhydrophobic surfaces, where different nano- and/or micro-scale materials are used to create hierarchical roughness, we create them in the same material as of the substrate. Primary roughness is due to the micron-sized one-dimensional wrinkles while a nanoscale secondary roughness is created on top of the wrinkles using replica molding through a nano-master. Due to the elastic nature of the underneath polymer, polydimethylsiloxane (PDMS), the fabricated superhydrophobic wrinkles demonstrate mechanically tunable wetting behavior between superhydrophobic and hydrophobic states. Water drops depict sticky superhydrophobic behavior on the fabricated samples as they show the Cassie impregnated state corresponding to the Petal effect.
|Journal||Applied Physics A: Materials Science and Processing|
|State||Published - 1 Aug 2019|
Bibliographical noteFunding Information:
Funding was provided by Science and Engineering Research Board (NanoMission).
This research work was supported by DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.