Bio-inspired hierarchical micro- and nano-wrinkles obtained via mechanically directed self-assembly on shape-memory polymers

Soft Matter
Senta SchauerHendrik Hölscher

Abstract

Inspired by complex multi-functional leaf and petal surfaces, we introduce a mechanically directed self-assembly process to create linearly oriented micro- and nanosized surface wrinkles in an all-polymer bi-layer system based on a shape-memory polymer substrate. By systematically investigating the influence of coating thickness and substrate programming strain on wrinkle period and height, we reveal how to control the structure size from a few hundred nanometers up to several microns. As a parameter unique to shape memory polymers, we demonstrate that the temperature during the recovery process can also be utilized to tailor the structure dimensions. Furthermore, we advance the method with a second structuring step to mimic the hierarchically structured petal surfaces of tulips and daisies. The presented structuring method provides a large-scale, mold-free, and very cost-effective way for the full-polymer fabrication of micro and sub-microstructures with adjustable structure size and intrinsic irregularity.

References

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Sep 28, 2007·Proceedings of the National Academy of Sciences of the United States of America·Hanqing JiangJohn A Rogers
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Jul 26, 2013·Journal of the Royal Society, Interface·Silvia VignoliniUllrich Steiner
Mar 22, 2016·ACS Applied Materials & Interfaces·Senta SchauerHendrik Hölscher
Aug 14, 2007·Soft Matter·Jun Young ChungChristopher M Stafford

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Citations

Sep 13, 2018·Macromolecular Rapid Communications·Senta SchauerStoyan K Smoukov
Oct 19, 2017·Nature·Edwige MoyroudBeverley J Glover
Oct 9, 2019·Proceedings of the National Academy of Sciences of the United States of America·Yu WangFiorenzo G Omenetto
May 6, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·C B LinSanboh Lee
Jun 13, 2019·ACS Applied Materials & Interfaces·Xichao LiangLina Zhang

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