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Hierarchical nested wrinkles on silica-polymer hybrid films: stimuli-responsive micro periodic surface architectures.


ABSTRACT: 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 µm and > 23 µm 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.

SUBMITTER: Tokudome Y 

PROVIDER: S-EPMC3448069 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Hierarchical nested wrinkles on silica-polymer hybrid films: stimuli-responsive micro periodic surface architectures.

Tokudome Yasuaki Y   Suzuki Kazumasa K   Kitanaga Takuya T   Takahashi Masahide M  

Scientific reports 20120921


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 contro  ...[more]

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