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

Stumpel, Jelle E. and Ziółkowski, Bartosz and Florea, Larisa and Diamond, Dermot and Broer, Dirk J. and Schenning, Albertus P.H.J. (2014) Photoswitchable ratchet surface topographies based on self-protonating spiropyran-NIPAAM hydrogels. ACS Applied Materials and Interfaces , 6 (10). pp. 7268-7274. ISSN 1944-8244

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in this work, self-protonating spiropryan based poly(N-isopropylacrylamide) polymer networks are prepared. These photoresponsive hydrogel coatings can change their surface topography upon exposure with visible light in neutral environment. Photoresponsive surface constrained films have been fabricated of which the swelling behaviour 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 crosslink density thus forming a corrugated surface. Asymmetric ratchet-like photoresponsive surfaces have been prepared on pre-structured asymmetric substrates. Due to thickness variations of the surface confined hydrogel layer as 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.

Item Type:Article (Published)
Uncontrolled Keywords:Spiropyran; Hydrogels
Subjects:Physical Sciences > Thin films
Physical Sciences > Photochemistry
Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > INSIGHT Centre for Data Analytics
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:American Chemical Society
Official URL:
Copyright Information:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Applied Materials and Interfaces , copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:VICI grant of The Netherlands Foundation for Scientific Research (NWO), Science Foundation Ireland under INSIGHT award SFI/12/RC/2289 , EU Framework 7 project “ATWARM” (Marie Curie ITN, No. 238273)
ID Code:19985
Deposited On:17 Jun 2014 14:36 by Larisa Florea. Last Modified 14 Oct 2016 13:16

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