Magnetic-Field Induced Isotropic-Nematic Phase Transition in PDLC Doped with Magnetic Nanoparticles

• Authors: Z. Mitróová , N. Tomašovičová , M. Timko , M. Koneracká , L. Tomčo , J. Jadżyn , T. Palewski , P. Kopčanský , O. Kovalchuk
• Languages of publication: EN

Abstracts

EN

The paper presents a study of the polymer dispersed liquid crystals that consist of liquid crystal 4-trans-4'-n-hexyl-cyclohexyl-isothiocyanatobenzene (6CHBT) microdroplets dispersed in polyvinyl alcohol and doped with various kinds of magnetic particles. As magnetic nanoparticles there were used single walled carbon nanotubes and magnetite labeled single walled carbon nanotubes. The volume concentration of the particles was 2 × 10^{-3}. Magnetic properties were investigated by a SQUID magnetometer. The higher saturation magnetization has been achieved in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes. The phase transition temperature from isotropic to nematic phase at the external magnetic field 0 T and 12 T was monitored by precise capacitance measurements in the capacitance cell filled with prepared sample. The significant shift of the phase transition temperature (0.2°C) at the external magnetic field 12 T has been observed in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes.

Keywords

EN

61.30.Gd; 75.30.Hx; 75.75.Fk; 77.84.Nh

Discipline

• 61.30.Gd: Orientational order of liquid crystals; electric and magnetic field effects on order
• 77.84.Nh: Liquids, emulsions, and suspensions; liquid crystals(for structure of liquid crystals, see 61.30.-v)
• 75.75.Fk: Domain structures in nanoparticles
• 75.30.Hx: Magnetic impurity interactions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1299-1301

Dates

published

2012-05

Contributors

author

Z. Mitróová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

N. Tomašovičová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Koneracká

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

L. Tomčo

• Faculty of Aeronautics, Technical University, Rampová 7, 041 21, Košice, Slovakia

author

J. Jadżyn

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

author

T. Palewski

• International Laboratory of High Magnetic Fields and Low Temperatures, Polish Academy of Sciences, Gajowicka 95, 53-421 Wrocław, Poland

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

O. Kovalchuk

• Institut of Physics, NASU, Kyiv, Ukraine

References

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Identifiers

DOI

10.12693/APhysPolA.121.1299