Magnetic Field Induced Structural Transitions in 6CHBT-Based Ferronematics

• Authors: N. Tomašovičová , M. Timko , M. Koneracká , V. Závišová , J. Jadżyn , E. Beaugnon , X. Chaud , P. Kopčanský
• Languages of publication: EN

Abstracts

EN

Ferronematics are stable colloidal suspensions of magnetic particles in nematic liquid crystals. The presence of the magnetic particles enhances the magnetic susceptibility of ferronematics, in comparison with pure liquid crystals. In this work the thermotropic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanato-benzene (6CHBT) and 6CHBT dissolved in phenyl isothiocyanate were doped with spherical magnetic nanoparticles with aim to increase the sensitivity of the liquid crystal on an external magnetic field. The volume concentration of the magnetic particles was 5 × 10^{-4}. The phase transition temperature from isotropic to nematic phase in the external magnetic field up to 12 T was monitored by precise capacitance measurements in the capacitance cells filled with nematic sample as well as with the prepared ferronematic sample. There was no observable shift in the transition temperature in the case of pure 6CHBT, 6CHBT doped with spherical particles and 6CHBT dissolved in phenyl isothiocyanate while in the case of 6CHBT dissolved in phenyl isothiocyanate doped with spherical magnetic particles the shift in the temperature about 9C of the phase transition from isotropic to droplet state at the external magnetic field 12 T was observed.

Keywords

EN

75.50.Mm; 61.30.Gd; 61.30.Hn

Discipline

• 61.30.Hn: Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
• 61.30.Gd: Orientational order of liquid crystals; electric and magnetic field effects on order
• 75.50.Mm: Magnetic liquids

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1276-1278

Dates

published

2012-05

Contributors

author

N. Tomašovičová

• Institute of Experimental Physics, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia

author

M. Koneracká

• Institute of Experimental Physics, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia

author

V. Závišová

• Institute of Experimental Physics, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia

author

J. Jadżyn

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

E. Beaugnon

• High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, Grenoble, France

author

X. Chaud

• High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, Grenoble, France

author

P. Kopčanský

• Institute of Experimental Physics, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.121.1276