Electrically induced storage effects in smectic A phase of dyed low molar mass siloxane liquid crystals |
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| Institution: | 1. Centre for Environment, Fisheries and Aquaculture Science (Cefas), Pakefield Road, Lowestoft, NR33 0HT, UK;2. Lighthouse Field Station, Institute of Biological and Environmental Sciences, University of Aberdeen, Cromarty IV11 8YL, UK;1. Department of Applied Biology, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500007, Telangana, India;2. Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India;3. COMET-NANO Group, Departamento de Biología y Geología, Física y Química Inorgánica, ESCET, Universidad Rey Juan Carlos, Calle Tulipán s/n, E-28933 Móstoles (Madrid), Spain;1. Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee Saharanpur Campus, Saharanpur, UP 247001, India;2. Department of Metallurgical Engineering & Materials Science, Indian Institute of Technology Bombay, Mumbai, Maharashtra 400076, India;3. Department of Electrical & Computer Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada;4. Department of Chemistry, Imperial College London, UK;1. Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China;2. Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China;3. College of Plant Protection, Southwest University, Chongqing 400715, China;4. The Connecticut Agricultural Experiment Station, New Haven, CT 06504, USA;5. Stockbridge School of Agriculture, University of Massachusetts Amherst, Amherst, MA 01003, USA |
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| Abstract: | A newly synthesized low molar mass liquid crystal having a flexible mesogenic group attached to methylene siloxane exhibiting smectic A phase has been used as a host for 2% (wt./wt.) dichroic dyes. The electro-optic properties of these guest–host mixtures have been studied as a function of temperature, frequency and the applied voltage. At low frequency (≲1 Hz), turbulent scattering texture was induced influenced by conduction mechanism. This texture was transformed to a clear homeotropic state due to dielectric reorientation of the smectic molecules at high frequency (>2 kHz). These materials have shown storage effects similar to monomeric and polymer smectogens. The effects of dichroic dyes on the electro-optic performances have been discussed. These systems are expected to prove functional materials for electronic displays. |
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