Abstract
We report an extensive set of results for the contact angles of wetting fluids at striped nanopatterned surfaces. We consider the contact angle perpendicular and parallel to the stripe pattern as a function of coverage, wavelength and energy contrast. The contact angle perpendicular to the stripe, where a hemicylindrical region of liquid is in effect pinned at or close to the pattern edge, is determined by the coverage and pattern geometry but is unrelated to the Youngs or Cassie law contact angle. It can be predicted by minimal models of the surface free energy. Above a given surface energy and coverage, the surface coverage unbends to a planar wetting film. The contact angle parallel to the stripe in contact with the vapour liquid boundary varies across the pattern as a function of wavelength (at fixed coverage) tending to a Cassie law value at low wavelength for low contrast patterns. However Cassie's law breaks down for high contrast patterns.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
