4.7 Article

Hierarchical Nested Wrinkles on Silica-Polymer Hybrid Films: Stimuli-Responsive Micro Periodic Surface Architectures

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SCIENTIFIC REPORTS
卷 2, 期 -, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/srep00683

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  1. Ministry of Education, Culture, Sports, Science and Technology (MEXT) [22655071, 22360276, 24750206]
  2. Murata Scientific Foundation
  3. Grants-in-Aid for Scientific Research [22360276, 22655071, 24750206] Funding Source: KAKEN

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Stimuli-response on hierarchically-structured surface wrinkles is required for advanced filtration, catalysis and sensing applications. Although conventional processes can form hierarchical surface wrinkles, incorporation of stimuli-responsive features has not been achieved, limiting the potential multi-scale functionality of wrinkles. Here, we demonstrate a novel process that can fabricate stimuli-responsive surface hierarchical structures on silica-polymer hybrid films through precisely controlled UV-polymerization and sol-gel condensation. Starting from uniform hybrid films, UV excitation of the film surface triggers the formation of micrometre-scale wrinkles with dual periodicity. Hierarchical nested wrinkle (NW) structures with controllable periodic lengths at discrete size scales of < 10 mu m and > 23 mu m show a shape-memory effect with changes in the surrounding humidity. Moreover, the individual responses of wrinkles with different periodicities can be controlled independently. As a proof-of-concept application, we demonstrate that the NW structures are an active size-selective adsorption/release surface for micrometre-sized particles.

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