Manipulation of the superhydrophobicity of plasma-etched polymer nanostructures

Ke Du, Youhua Jiang, Yuyang Liu, Ishan Wathuthanthri, Chang Hwan Choi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The manipulation of droplet mobility on a nanotextured surface by oxygen plasma is demonstrated by modulating the modes of hydrophobic coatings and controlling the hierarchy of nanostructures. The spin-coating of polytetrafluoroethylene (PTFE) allows for heterogeneous hydrophobization of the high-aspect-ratio nanostructures and provides the nanostructured surface with "sticky hydrophobicity", whereas the self-assembledmonolayer coating of perfluorodecyltrichlorosilane (FDTS) results in homogeneous hydrophobization and "slippery superhydrophobicity". While the high droplet adhesion (stickiness) on a nanostructured surface with the spin-coating of PTFE is maintained, the droplet contact angle is enhanced by creating hierarchical nanostructures via the combination of oxygen plasma etching with laser interference lithography to achieve "sticky superhydrophobicity". Similarly, the droplet mobility on a slippery nanostructured surface with the self-assembled monolayer coating of FDTS is also enhanced by employing the hierarchical nanostructures to achieve "slippery superhydrophobicity" with modulated slipperiness.

Original languageEnglish
Article number304
JournalMicromachines
Volume9
Issue number6
DOIs
StatePublished - 18 Jun 2018
Externally publishedYes

Keywords

  • Droplet mobility
  • Nanostructures
  • Plasma etching
  • Polymer
  • Superhydrophobicity

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