alexa Azo Substituted Achiral Bent-core Liquid Crystals: Photo-induced Studies In B7 And B2 Mesophases | 63655
ISSN: 2169-0022

Journal of Material Sciences & Engineering
Open Access

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3rd International Conference on Smart Materials & Structures

Veena Prasad
Centre for Nano and Soft Matter Sciences, India
Posters & Accepted Abstracts: J Material Sci Eng
DOI: 10.4172/2169-0022.C1.062
Abstract
A new surge of activity in the field of ferro-/antiferro-electric liquid crystals was prompted in 1996 by the observation of ferroelectric switching in achiral bent-core compounds. Later, several such compounds exhibiting electro-optically switchable mesophases were reported. The first photochromic azo functionalized bent-core liquid crystals were reported by us in 2001. The reversible photo-induced effects observed, in transition temperatures and electro-optical switching properties of the mesophases exhibited by these compounds have added a new dimension to the exciting field of bent-core liquid crystals. Thus, we continued our investigations on such azo functionalized compounds from various aspects. In this presentation, I will be describing three structural variants of azo substituted achiral bent-core compounds constituting of symmetrical and non-symmetrical molecules. It was found that the non-symmetrical molecules are more conducive to mesomorphism than the symmetrical ones. We observed B1 (Colr), B2 (SmCAPA) and B7 mesophases in these compounds. The B7 mesophase was found to have a modulated layer structure. We also report for the first time, the photo-induced studies in the B7 mesophase and make a comparison of these results with those obtained in a B2 mesophase. From our studies, we observed that these effects are more profound in the case of B7 mesophase when compared to the B2 mesophase in such systems.
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