Design parameters for "robust" superoleophobic surfaces

K. Y. Law*, H. Zhao, K. C. Park

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Earlier we reported the fabrication of a model superoleophobic surface comprising ∼3 μm diameter pillar arrays (height ∼7.8 μm, pitch 6 μm) on silicon wafer via the conventional photolithography and surface fluorosilanation techniques. Results showed that both surface fluorination and the re-entrant structure in the pillar are crucial in achieving superoleophobicity and superhydrophobicity with hexadecane and water contact angles exceeding 150° and sliding angles at ∼10°. In this work, we investigate design parameters for the fabrication of a superoleophobic surface that is robust against wetting breakthrough pressure and mechanical abrasion. By studying the effects of pillar height, size and spacing, we show that both static and advancing contact angles remain "super" (>150°) as the pillar size and spacing vary, the receding contact angle, sliding angle and contact angle hysteresis, on the other hand, are found to be sensitive to these structural changes. The receding angle decreases and both sliding angle and hysteresis increase as the solid area fraction increases. Interestingly, surface superoleophobicity remains as the height of the pillar decreases from ∼7.8 to 1 μm. Surface Evolver simulation was used to model the location of the contact line as well as the robustness in wetting against external pressure. The abrasion resistance of the pillar array surface was assessed by mechanical modeling and nanoindenter measurement. The design space for fabricating a mechanically robust superoleophobic surface is discussed.

Original languageEnglish (US)
Title of host publicationTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
Pages656-659
Number of pages4
StatePublished - 2012
EventNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 - Santa Clara, CA, United States
Duration: Jun 18 2012Jun 21 2012

Publication series

NameTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012

Other

OtherNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
CountryUnited States
CitySanta Clara, CA
Period6/18/126/21/12

Keywords

  • Breakthrough pressure
  • Design parameters
  • Robustness
  • Superoleophobicity
  • Surface texturing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Surfaces, Coatings and Films

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