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Proceedings Paper

Optical and topographic changes in water-responsive patterned cholesteric liquid crystalline polymer coatings
Author(s): Jelle E. Stumpel; Dirk J. Broer; Cees W. M. Bastiaansen; Albert P. H. J. Schenning
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Paper Abstract

In this work, we present patterned water-responsive coatings, which alter both their topological and optical properties. The polymer coatings are based on a hydrogen-bonded cholesteric liquid crystalline polymer network. A two-step photopolymerization procedure leads to a patterned coating with repeating liquid crystalline and isotropic areas. The cholesteric liquid crystalline areas reflect green light, whilst the isotropic areas are transparent for visible light. Treatment with alkaline solution results in a hygroscopic polymer salt coating. When placed in demineralized water, the polymer films swells, leading to an enhancement of the surface topography structure in which the liquid crystalline areas swell more. Moreover, the pitch of the helical organization in the cholesteric areas increases due to this swelling leading to a color change from green to red.

Paper Details

Date Published: 1 May 2014
PDF: 7 pages
Proc. SPIE 9137, Organic Photonics VI, 91370U (1 May 2014); doi: 10.1117/12.2052678
Show Author Affiliations
Jelle E. Stumpel, Technische Univ. Eindhoven (Netherlands)
Dirk J. Broer, Technische Univ. Eindhoven (Netherlands)
Cees W. M. Bastiaansen, Technische Univ. Eindhoven (Netherlands)
Queen Mary Univ. of London (United Kingdom)
Albert P. H. J. Schenning, Technische Univ. Eindhoven (Netherlands)

Published in SPIE Proceedings Vol. 9137:
Organic Photonics VI
Barry P. Rand; Chihaya Adachi; David Cheyns; Volker van Elsbergen, Editor(s)

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