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Pitch Variations in Cholesteric Liquid Crystal Film by Molecular Diffusion  

Kwon Young-Jin (Materials Research Center for Information Display, Kyung Hee University)
Lee Won-Ju (Materials Research Center for Information Display, Kyung Hee University)
Kim Beom-Kyung (Materials Research Center for Information Display, Kyung Hee University)
Kim In-Sun (I-components)
Song Ki-Gook (Materials Research Center for Information Display, Kyung Hee University)
Publication Information
Polymer(Korea) / v.30, no.5, 2006 , pp. 422-425 More about this Journal
Abstract
Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layers through a diffusion of small molecules and through a thermal mixing of cyclic siloxane CLC molecules with different pitch lengths. Various pitch gradients in the CLC cell were observed using UV/Vis spectrometer and SEM technique.
Keywords
cholesteric liquid crystal; selective reflection; diffusion; pitch variation;
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