title: Dielectric technique to measure the twist elastic constant of liquid crystals: the case of a bent-core material.
abstract: The effect of director pretilt on the twist magnetic Fréedericksz transition of nematics was investigated in a planar cell. The director configuration was calculated as a function of magnetic inductance. The dielectric and optical response of the nematic liquid crystal was numerically modeled. A dielectric measurement method for determining the elastic constant K_{22} is presented. The influence of the conditions for the Mauguin effect is discussed. The theoretical predictions were confirmed by our experiments. Experimental data for all elastic constants of a bent-core nematic material are presented and discussed.
authors.affiliation: Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary.
authors.forename: P
authors.initials: P
authors.lastname: Salamon
authors.forename: N
authors.initials: N
authors.lastname: Eber
authors.forename: J
authors.initials: J
authors.lastname: Seltmann
authors.forename: M
authors.initials: M
authors.lastname: Lehmann
authors.forename: J T
authors.initials: JT
authors.lastname: Gleeson
authors.forename: S
authors.initials: S
authors.lastname: Sprunt
authors.forename: A
authors.initials: A
authors.lastname: Jákli
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D050866:Liquid Crystals / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular