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Issue 10, 2014
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Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording

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Abstract

A cholesteric ester dimer – dicholesteryl icosanedioate – was examined for color imaging. Cholesterol was introduced as one of the dopants which performed an important role reducing phase transition temperatures. The other dopants, 4,4′-dialkoxyazobenzene and 4,4′-dialkoxybiphenyl promoted formation of smectic domains in cholesteric phases which resulted in the expansion of the reflective band shift over the whole visible region. In particular, the photo-responsive dopant 4,4′-dialkoxyazobenzene allowed us to realize reversible RGB color tuning of the cholesteric film by both photon and thermal modes. The transcis photoisomerization led to a cholesteric pitch change which resulted in reflective color change, and recorded optical images that have been stable for more than 8 months in a glassy solid film state.

Graphical abstract: Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording

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Publication details

The article was received on 05 Nov 2013, accepted on 10 Dec 2013 and first published on 29 Jan 2014


Article type: Paper
DOI: 10.1039/C3TC32179G
Citation: J. Mater. Chem. C, 2014,2, 1921-1926
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    Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording

    Y. Kim, M. Wada and N. Tamaoki, J. Mater. Chem. C, 2014, 2, 1921
    DOI: 10.1039/C3TC32179G

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