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    Local Wrinkle Patterning with Controlled Morphologies on a Membrane

    Year: 2019

    Journal: Int. J. Precis. Eng. Manuf., Volume 20, AUG, page 1415–1421

    Authors: Li, Xin; Park, Sang-Hu

    Organizations: Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP); Ministry of Trade, Industry and Energy, Republic of Korea [20164010201000]; Ministry of Strategy and Finance, Republic of Korea (MOSF) [EO170041]

    Keywords: Local out-of-plane stretching; Pre-strain distribution; Tunable wrinkling patterns; UV-polymerization; Local surface modification

    Tailoring microscale wrinkle patterns is of great importance in diverse surface applications where wetting behavior, optical phenomena, adhesion control, and other factors need to be optimized. Here, we report a local-out-of-plane stretching (LOPS) method for simultaneously generating diverse wavy patterns like labyrinthine, wavy, and straight lines. Multi-step LOPS was introduced on a UV-curable thin-resin-layered membrane with various types of punches, realizing a designed pattern with microscale wrinkles based on elastic instabilities. We illustrate that the wrinkling morphologies can be controlled simply by changing the punch shape and number of strokes. Experiments and numerical simulations were done to understand the wrinkling mechanism of LOPS. The results provide insights into the control of local wettability using topographical, tunable wrinkling patterns applicable to biochips, microfluidic devices, and flexible electronics.
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