https://doi.org/10.1140/epje/s10189-023-00326-2
Regular Article - Soft Matter
Collective modes, relaxations, de Vries behavior and field influence in SmA and SmC*deVr phases of chiral liquid crystal dimer C-10Bms with siloxy spacer
1
Department of Physics, University College of Engineering, Jawaharlal Nehru Technological University:Kakinada, 533003, Kakinada, India
2
Department of Chemistry, College of Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Oman
3
Department of Chemistry, Manipal Institute of technology, Manipal Academy of Higher Education, 576104, Manipal, India
4
Department of Physics, Vignan Foundation for Science, Technology and Research, 522213, Vadlamudi, India
g
dakshinamurthy_potukuchi@yahoo.com
Received:
2
May
2023
Accepted:
18
July
2023
Published online:
2
October
2023
Investigations in chiral liquid crystal dimer with trisiloxy unit on spacer unit, viz. C-10Bms, are reported with respect to its resolved dipole moment. Occurrence of SmA and SmC*deVr LC phases was characterized by POM and DSC. Relatively enhanced thermal range of LC phases in dimer configuration was detailed. Tilt angle, hysteresis, polarization, collective modes and other low-frequency relaxations were investigated. Primary order parameter revealed validity of critical field model. Moderate tilt for viewing angle and electro-clinic response for switch speed in dimer were addressed. Hysteresis in SmC*deVr ensued storage capability for memories. Slightly higher activation energy Ea was attributed to siloxy chain on spacer. Goldstone and Soft modes were identified in SmC*deVr phase. Field influence on Goldstone mode was analyzed. Equivalence of thermal/Arrhenius and field activation energies was observed. Curie–Weiss law for SM revealed strong collective ferroelectric response. Temperature and field trends of dielectric relaxation parameters were addressed in terms of chiral center-based out-of-phase dipole moment. Figure of merit parameters in SmC*deVr estimated by dielectric loss revealed its relative performance far below the SmA-SmC*deVr phase transition.
T.I. : Novel Molecular Materials and Devices from Functional Soft Matter. Guest editors: Jean-Marc Di Meglio, Aritra Ghosh, Orlando Guzmán, P. Lakshmi Praveen.
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