Photoswitchable ratchet surface topographies based on self protonating spiropyran-NIPAAM hydrogels

J.E. Stumpel, B. Ziólkowski, L. Florea, D. Diamond, D.J. Broer, A.P.H.J. Schenning

Research output: Contribution to journalArticleAcademicpeer-review

36 Citations (Scopus)

Abstract

In this work, self-protonating spiropyran-based poly(N-isopropylacrylamide) polymer networks are prepared. These photoresponsive hydrogel coatings can change their surface topography upon exposure with visible light in a neutral environment. Photoresponsive surface-constrained films have been fabricated for which the swelling behavior can be controlled in a reversible manner. In a first step, symmetrical switchable surface topologies with varying cross-link density are obtained by polymerization-induced diffusion. Under light exposure, the areas with low cross-link density swell more than the areas with high cross-link density, thus forming a corrugated surface. Asymmetric ratchet-like photoresponsive surfaces have been prepared on prestructured asymmetric substrates. As a result of thickness variation of the surface-confined hydrogel layer, an asymmetric swelling behavior is obtained. Depending on the cross-link density of the hydrogel, it is possible to switch between a ratchet and flat surface topography or even an inverse ratchet surface by light.
LanguageEnglish
Pages7268-7274
Number of pages7
JournalACS Applied Materials & Interfaces
Volume6
Issue number10
DOIs
StatePublished - 2014

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Hydrogels
Surface topography
Hydrogel
Swelling
Telecommunication links
spiropyran
Polymers
Polymerization
Switches
Topology
Coatings
Substrates

Cite this

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title = "Photoswitchable ratchet surface topographies based on self protonating spiropyran-NIPAAM hydrogels",
abstract = "In this work, self-protonating spiropyran-based poly(N-isopropylacrylamide) polymer networks are prepared. These photoresponsive hydrogel coatings can change their surface topography upon exposure with visible light in a neutral environment. Photoresponsive surface-constrained films have been fabricated for which the swelling behavior can be controlled in a reversible manner. In a first step, symmetrical switchable surface topologies with varying cross-link density are obtained by polymerization-induced diffusion. Under light exposure, the areas with low cross-link density swell more than the areas with high cross-link density, thus forming a corrugated surface. Asymmetric ratchet-like photoresponsive surfaces have been prepared on prestructured asymmetric substrates. As a result of thickness variation of the surface-confined hydrogel layer, an asymmetric swelling behavior is obtained. Depending on the cross-link density of the hydrogel, it is possible to switch between a ratchet and flat surface topography or even an inverse ratchet surface by light.",
author = "J.E. Stumpel and B. Zi{\'o}lkowski and L. Florea and D. Diamond and D.J. Broer and A.P.H.J. Schenning",
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journal = "ACS Applied Materials & Interfaces",
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Photoswitchable ratchet surface topographies based on self protonating spiropyran-NIPAAM hydrogels. / Stumpel, J.E.; Ziólkowski, B.; Florea, L.; Diamond, D.; Broer, D.J.; Schenning, A.P.H.J.

In: ACS Applied Materials & Interfaces, Vol. 6, No. 10, 2014, p. 7268-7274.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Photoswitchable ratchet surface topographies based on self protonating spiropyran-NIPAAM hydrogels

AU - Stumpel,J.E.

AU - Ziólkowski,B.

AU - Florea,L.

AU - Diamond,D.

AU - Broer,D.J.

AU - Schenning,A.P.H.J.

PY - 2014

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N2 - In this work, self-protonating spiropyran-based poly(N-isopropylacrylamide) polymer networks are prepared. These photoresponsive hydrogel coatings can change their surface topography upon exposure with visible light in a neutral environment. Photoresponsive surface-constrained films have been fabricated for which the swelling behavior can be controlled in a reversible manner. In a first step, symmetrical switchable surface topologies with varying cross-link density are obtained by polymerization-induced diffusion. Under light exposure, the areas with low cross-link density swell more than the areas with high cross-link density, thus forming a corrugated surface. Asymmetric ratchet-like photoresponsive surfaces have been prepared on prestructured asymmetric substrates. As a result of thickness variation of the surface-confined hydrogel layer, an asymmetric swelling behavior is obtained. Depending on the cross-link density of the hydrogel, it is possible to switch between a ratchet and flat surface topography or even an inverse ratchet surface by light.

AB - In this work, self-protonating spiropyran-based poly(N-isopropylacrylamide) polymer networks are prepared. These photoresponsive hydrogel coatings can change their surface topography upon exposure with visible light in a neutral environment. Photoresponsive surface-constrained films have been fabricated for which the swelling behavior can be controlled in a reversible manner. In a first step, symmetrical switchable surface topologies with varying cross-link density are obtained by polymerization-induced diffusion. Under light exposure, the areas with low cross-link density swell more than the areas with high cross-link density, thus forming a corrugated surface. Asymmetric ratchet-like photoresponsive surfaces have been prepared on prestructured asymmetric substrates. As a result of thickness variation of the surface-confined hydrogel layer, an asymmetric swelling behavior is obtained. Depending on the cross-link density of the hydrogel, it is possible to switch between a ratchet and flat surface topography or even an inverse ratchet surface by light.

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