Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/5397
Title: | Investigations on photo and electrically switchable asymmetric bent-core liquid crystals |
Authors: | Srinivasan, Murugesen Vijay Kannan, Palaninathan Roy, Arun |
Issue Date: | Mar-2013 |
Publisher: | Springer Sciences |
Citation: | Journal of Materials Science, 2013, Vol.48, p2433 |
Abstract: | New series of bent-core liquid crystals (8a–8d) synthesized and their photo and electrical switching properties were investigated. The homologous series of liquid crystals was constructed with five-ring system using structurally non-symmetrical rod-like mesogens connected with 1, 3-phenylene unit. The synthesized precursor and bent-core liquid crystals were characterized by FT-IR, 1H-NMR, and 13C-NMR spectroscopy. The mesophase characterization of the asymmetric bent-core liquid crystals was carried out using polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction studies. The significance of tail length (alkyl chain) and nature of mesogen was explored; shorter alkyl chains bent-core compounds exhibited non-switchable rectangular columnar B1 phase. Whereas longer alkyl chain induces switchable lamellar B2 phase, which was further confirmed by electro-optical methods. This lamellar B2 phase exhibits antiferroelectric–anticlinic organization (SmCAPA) of the molecules in the layers. The photo-switching properties of bent-core azo molecules were investigated using UV–Vis spectroscopy, the trans to cis photoisomerization was observed at 30 s, whereas reverse processes take place in 40 s in chloroform. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/5397 |
ISSN: | 0022-2461 1573-4803- (Online) |
Alternative Location: | http://dx.doi.org/10.1007/s10853-012-7030-x |
Copyright: | 2013 Springer Science |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2013_JMatSci_48_2433.pdf Restricted Access | Restricted Access | 1.07 MB | Adobe PDF | View/Open Request a copy |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.