Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Anisotropic Wetting on Tunable Micro-Wrinkled Surfaces

Published

Author(s)

Jun Y. Chung, Jeffrey Youngblood, Christopher M. Stafford

Abstract

We demostrate that the buckling instability technique is promising for studying wettability because key elements of surface topography such as surface roughness can be precisely controlled by simple changes in experimental conditions. For demonstration, we investigate the anisotropic wetting on tunable micro-wrinkled surfaces, whose roughness aspect ratios (amplitude versus wavelength of the wrinkles) are well-defined and reversibly adjusted. In addition to confirming the effectiveness of this technique, our results provide new insights into the wetting behavior on a rough surface. We find that the wetting anisotropy is affected primarily by the roughness aspect ratio. We apply our experimental results to existing theoretical models and successfully demonstate that the anistotropy of the droplet distortion and contact angle with a strong anisotropic texture is attributed to the difference in the energy barrier of wetting in two orthogonal directions.
Citation
Soft Matter
Volume
3

Keywords

buckling, contact angle, instabilities, patterning, topography, wettability, wrinkling

Citation

Chung, J. , Youngblood, J. and Stafford, C. (2007), Anisotropic Wetting on Tunable Micro-Wrinkled Surfaces, Soft Matter, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852743 (Accessed April 17, 2024)
Created January 1, 2007, Updated February 19, 2017