Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles

• Authors: K. Csach , A. Juríková , J. Miškuf , N. Tomašovičová , V. Gdovinová , V. Závišová , P. Kopčanský , N. Éber , K. Fodor-Csorba , A. Vajda
• Languages of publication: EN

Abstracts

EN

A binary mixture of bent-core and rod-shaped liquid crystals was chosen as a model substance combining the properties of both types of liquid crystals. The mixture was doped with a small amount of spherical and rod-like magnetic nanoparticles. Differential scanning calorimetry experiments were performed for the pure as well as for the doped mixture at different heating rates ranging from 1 to 16°C/min. The addition of the magnetic nanoparticles lowered the phase transition temperature. This effect is more intensive in the case of the rod-like magnetic nanoparticles. The kinetics of the nematic to isotropic phase transition was evaluated in the framework of the differential isoconversional method. The calculated apparent activation energy showed non-monotonic behaviour and a sensitivity on the shape of added magnetic nanoparticles.

Keywords

EN

61.30.-v; 64.70.mj; 65.80.-g

Discipline

• 61.30.-v: Liquid crystals(for phase transitions in liquid crystals, see 64.70.M-; for liquid crystals as dielectric materials, see 77.84.Nh; for liquid crystals as optical materials, see 42.70.Df; for liquid crystal devices, see 42.79.Kr)
• 65.80.-g: Thermal properties of small particles, nanocrystals, nanotubes, and other related systems
• 64.70.mj: Experimental studies of liquid crystal transitions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 949-951

Dates

published

2017-04

Contributors

author

K. Csach

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

author

A. Juríková

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

author

J. Miškuf

• 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

V. Gdovinová

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

author

V. Závišová

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

author

P. Kopčanský

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

author

N. Éber

• Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary

author

K. Fodor-Csorba

• Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary

author

A. Vajda

• Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary

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Identifiers

DOI

10.12693/APhysPolA.131.949