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Increasing the magnetic sensitivity of liquid crystals by rod-like magnetic nanoparticles

P. Kopċanský1 - N. Tomašoviċová1 - T. Tóth-Katona2 - N. Éber2 - M. Timko1 - V. Závišová1 - J. Majorošová1 - M. Rajňak1 - J. Jadzyn3 - X. Chaud4

1 Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia
2 Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
3 Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznan, Poland
4 High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, Grenoble, France

Magnetic Fréedericksz transition was studied in ferronematics based on the nematic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT). 6CHBT was doped with rod-like magnetic particles of different size and volume concentration. The volume concentrations of magnetic particles in the prepared ferronematics were φ1=10−4 and φ2=10−3. Structural changes were observed by capacitance measurements, which evidenced of a significant influence of the concentration, shape anisotropy and/or the size of the magnetic particles on the magnetic response of these ferronematics. Tables 1, Figs 3, Refs 14.

Magnetohydrodynamics 49, No. 3/4, 586-591, 2013 [PDF, 0.53 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X