Photo-responsive surface topology in chiral nematic media

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Samenvatting

We report on the design and fabrication of 'smart surfaces' that exhibit dynamic changes in their surface topology in response to exposure to light. The principle is based on anisotropic geometric changes of a liquid crystal network upon a change of the molecular order parameter. The photomechanical property of the coating is induced by incorporating an azobenzene moiety into the liquid crystal network. The responsive surface topology consists of regions with two different types of molecular order: planar chiral-nematic areas and homeotropic. Under flood exposure with 365 nm light the surfaces deform from flat to one with a surface relief. The height of the relief structures is of the order of 1 um corresponding to strain difference of around 20%. Furthermore, we demonstrate surface reliefs can form either convex or concave structures upon exposure to UV light corresponding to the decrease or increase molecular order parameter, respectively, related to the isomeric state of the azobenzene crosslinker. The reversible deformation to the initial flat state occurs rapidly after removing the light source.
Originele taal-2Engels
TitelEmerging Liquid Crystal Technologies VII, January 21, 2012, San Francisco, California
RedacteurenL-C Chien
UitgeverijSPIE
DOI's
StatusGepubliceerd - 2012
Evenement7th Emerging Liquid Crystal Technologies Conference (ELCT 2012) - San Francisco, Verenigde Staten van Amerika
Duur: 22 jan 201225 jan 2012
Congresnummer: 7

Publicatie series

NaamProceedings of SPIE
Volume8279
ISSN van geprinte versie0277-786X

Congres

Congres7th Emerging Liquid Crystal Technologies Conference (ELCT 2012)
Verkorte titelELCT 2012
LandVerenigde Staten van Amerika
StadSan Francisco
Periode22/01/1225/01/12
AnderEmerging Liquid Crystal Technologies VII

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