|
|||||
|
|
Electro-optical features of antiferroelectric liquid crystal material (S)-(+)-4-(1-methylheptyloxycarbonyl) phenyl 4′-(6-octanoyloxyhex-1-oxy) biphenyl-4-carboxylate in its ferro and antiferroelectric phases |
|
| Authors: | Sandeep Singh Aanchal DwivediR Dabrowski R Dhar |
| Institution: | a Materials Research Laboratory, Physics Department, Ewing Christian College, University of Allahabad, Allahabad 211003, India b Physics Department, University of Allahabad, Allahabad 211002, India c Institute of Chemistry, Military University of Technology, Warsaw 00-908, Poland d Centre of Materials Sciences, Institute of Inter Disciplinary Studies, University of Allahabad, Allahabad 211002, India |
| Abstract: | A detailed investigation of the electro-optical switching parameters of an antiferroelectric liquid crystal (S)-(+)-4-(1-methylheptyloxycarbonyl) phenyl 4′-(6-octanoyloxyhex-1-oxy) biphenyl-4-carboxylate (abbreviated as S-7H6Bi) has been carried out. S-7H6Bi has paraelectric (SmA?) and ferroelectric (SmC?) phases in addition to antiferroelectric (SmC?A) phase. Switching parameters viz. spontaneous polarization and switching time were determined by polarization reversal method. The spontaneous polarization (Ps) is found to be highly temperature dependent and decreases with temperature. The maximum value of Ps is found to be ∼90 nC/cm2 whereas the switching time (ts) is found to be of the order 1-2 ms. The temperature dependent torsional viscosity (γt) is of the order 10 Pa sec. It increases with decrease in temperature. |
| Keywords: | Antiferroelectric liquid crystals Spontaneous polarization Torsional viscosity Switching time |
| 本文献已被 ScienceDirect 等数据库收录！ | |