Abstract
The hydrophobicity of film surfaces can be enhanced by introducing wrinkling and buckling, and the wrinkling method in this study is a facile way to induce various microstructures including wrinkles and buckles in film surfaces. When buckles formed, the water contact angle parallel to the wrinkled direction (θ//) changed dramatically with strain, but the contact angle perpendicular to the wrinkled direction did not change much. It was found that the buckle structural feature was the key characteristics affecting the change in contact angle, θ//. A dimensionless number, the ratio of buckle height to spacing (Hb/Sb) was introduced to determine the relationship between the structural feature and the contact angle, θ//. The contact angle, θ// strongly depended on Hb/Sb. The thickest film (hf = 605 nm) at the highest strain (ɛ = 30%) and the highest Hb/Sb formed many large buckles, and exhibited super-hydrophobicity (θ// = 169 ± 10°).
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Acknowledgments: This research was supported by the Ministry of Trade, Industry and Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT) through the Encouragement Program for The Industries of Economic Cooperation Region (R0004136) and was also supported by the Core Research Project at Korea Research Institute of Chemical Technology (KRICT) (KK-1806-C00) funded by the Ministry of Science and ICT, Korea.
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Byeon, M., Cho, S.K., Um, M.S. et al. Enhancing Hydrophobicity of Polymer Thin Film-Coated Surface by Wrinkling Method. Macromol. Res. 28, 1104–1110 (2020). https://doi.org/10.1007/s13233-020-8158-1
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DOI: https://doi.org/10.1007/s13233-020-8158-1