Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 10, Pages 7268-7274Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am500542f
Keywords
photoresponsive hydrogel; spiropyran; N-isopropylacrylamide; ratchet; surface topography
Funding
- VICI grant of The Netherlands Foundation for Scientific Research
- Science Foundation Ireland under INSIGHT [SFI/12/RC/2289]
- EU Framework 7 project ATWARM (Marie Curie ITN) [238273]
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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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