Controlled Three-Dimensional Hierarchical Structuring by Memory-Based, Sequential Wrinkling

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• 作者：Won-Kyu Lee ; Clifford J. Engel ; Mark D. Huntington ; Jingtian Hu ; Teri W. Odom
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：5624-5629
• 全文大小：473K
• ISSN：1530-6992

文摘

This paper describes how a memory-based, sequential wrinkling process can transform flat polystyrene sheets into multiscale, three-dimensional hierarchical textures. Multiple cycles of plasma-mediated skin growth followed by directional strain relief of the substrate resulted in hierarchical architectures with characteristic generational (G) features. Independent control over wrinkle wavelength and wrinkle orientation for each G was achieved by tuning plasma treatment time and strain-relief direction for each cycle. Lotus-type superhydrophobicity was demonstrated on three-dimensional G1鈥揋2鈥揋3 hierarchical wrinkles as well as tunable superhydrophilicity on these same substrates after oxygen plasma. This materials system provides a general approach for nanomanufacturing based on bottom-up sequential wrinkling that will benefit a diverse range of applications and especially those that require large area (>cm²), multiscale, three-dimensional patterns.