Abstract
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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Abbreviations
- F :
-
Compressive force acting on the plate
- h :
-
Thickness of the top layer
- w :
-
Width of the top layer
- λ :
-
Sinusoidal periodic deflection profile of the wrinkles
- E s, υ s, E f, and υ f :
-
Elastic moduli and the Poisson ratio of the skin and elastic foundation, respectively
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Acknowledgements
This work was supported by the “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), and was granted financial support from the Ministry of Trade, Industry and Energy, Republic of Korea. (Grant No. 20164010201000) and partially supported by the Ministry of Strategy and Finance, Republic of Korea (MOSF) under Grant EO170041.
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Li, X., Park, SH. Local Wrinkle Patterning with Controlled Morphologies on a Membrane. Int. J. Precis. Eng. Manuf. 20, 1415–1421 (2019). https://doi.org/10.1007/s12541-019-00146-5
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DOI: https://doi.org/10.1007/s12541-019-00146-5