title: Structural changes in the 6CHBT liquid crystal doped with spherical, rodlike, and chainlike magnetic particles.
abstract: In this work the 4-(trans- 4'-n -hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements and showed significant influence of the shape and size of the magnetic particles on the magnetic Fréedericksz transition. For the volume concentration phi= 2 x 10(-4) of the magnetic particles, the critical magnetic field was established for the pure liquid crystal, and for liquid crystals doped with spherical, chainlike, and rodlike magnetic particles. The influence of the magnetic field depends on the type of anchoring, which is characterized by the density of anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. The experimental results indicated soft anchoring in the case of spherical magnetic particles and rigid anchoring in the case of rodlike and chainlike magnetic particles, with parallel initial orientation between the magnetic moments of the magnetic particles and director.
authors.affiliation: Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 04001 Kosice, Slovakia.
authors.forename: Peter
authors.initials: P
authors.lastname: Kopcanský
authors.forename: Natália
authors.initials: N
authors.lastname: Tomasovicová
authors.forename: Martina
authors.initials: M
authors.lastname: Koneracká
authors.forename: Vlasta
authors.initials: V
authors.lastname: Závisová
authors.forename: Milan
authors.initials: M
authors.lastname: Timko
authors.forename: Anezka
authors.initials: A
authors.lastname: Dzarová
authors.forename: Adriana
authors.initials: A
authors.lastname: Sprincová
authors.forename: Nándor
authors.initials: N
authors.lastname: Eber
authors.forename: Katalin
authors.initials: K
authors.lastname: Fodor-Csorba
authors.forename: Tibor
authors.initials: T
authors.lastname: Tóth-Katona
authors.forename: Aniko
authors.initials: A
authors.lastname: Vajda
authors.forename: Jan
authors.initials: J
authors.lastname: Jadzyn