Design and characterization of hydrogen bonded ferroelectric liquid crystals: A study of light modulation in nematic and smectic orderings

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• 作者：V.N. Vijayakumar ; M.L.N. Madhu Mohan ; ^{mln.madhu@gmail.com}
• 关键词：Liquid crystals ; Chemical synthesis ; Dielectric response ; Field induced transition
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2012
• 期刊代码：13_00304026
• 类别：et
• 出版时间：June, 2012
• 卷：123
• 期：12
• 页码：1044-1050
• 文件大小：1318 K

摘要

A novel series of hydrogen bonded ferroelectric liquid crystals (HBFLC) have been isolated. Phase transition temperatures obtained by differential scanning calorimetry (DSC) and textural observations elicited by polarizing optical microscope (POM) studies are discussed. Phase diagram is constructed from the above data. Salient feature of the present work is observation of a light modulation due to field induced transitions (FiT) in nematic and smectic C* phases. Tilt angle measurements in various FiT of smectic C* phase are discussed. One of the mesogens in nematic phase behaves like an optical modulator; helical pitch measurements support the above observation.