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Twist Grain Boundary Phases in the Binary Mixtures of Smectic and Cholesteryl Compounds |
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| Authors: | J. Mahadeva Nagappa K. Rajashekara Prasad P. R. Alapati |
| Affiliation: | 1. Department of Physics , PES College of Science , Mandya , INDIA;2. Department of Studies in Physics , University of Mysore , Manasagangotri, Mysore , 570 006 , INDIA;3. Department of Chemistry , University of Mysore , Manasagangotri, Mysore , 570 006 , INDIA;4. Department of Physics , N E R I S T , Itanagar , INDIA |
| Abstract: | Abstract The binary mixture of Terephthal-bis-p-n-hexadecylaniline (TB16A) and cholesteryl nonanoate (CN) exhibits I - N* - TGB A - TGB c*- Sm A - Sm I - Sm F - Sm G - K phases in the concentration region between 95 to 98% of TB16A at higher temperature range. The 90% of TB16A exhibits I - N* - TGB A - TGB c - Sm A - Sm I - Sm F - K phases. The mixtures of concentration between 50 to 80% of TB16A exhibits I - Sm A - Sm I - K phases. The frustrated blue phase is also observed in the mixtures of lower concentration of TB16A in CN at higher temperature. Optical, DSC and X-ray studies were carried out for the identification of the different phases. The phase diagram of the Chen-Lubensky model in this context is discussed. |
| Keywords: | TGB phase Binary Mixtures Smectic and Cholesteryl Compounds |