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Anisotropic Wetting on Tunable Micro-Wrinkled Surfaces



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


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.
Soft Matter


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


Chung, J. , Youngblood, J. and Stafford, C. (2007), Anisotropic Wetting on Tunable Micro-Wrinkled Surfaces, Soft Matter, [online], (Accessed April 17, 2024)
Created January 1, 2007, Updated February 19, 2017