Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles
K. Csacha, A. Juríková a, J. Miškuf a, N. Tomašovičová a, V. Gdovinová a, V. Závišová a, P. Kopčanský a, N. Éber b, K. Fodor-Csorba b and A. Vajda b
aInstitute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
bInstitute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
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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.

DOI: 10.12693/APhysPolA.131.949
PACS numbers: 61.30.-v, 64.70.mj, 65.80.-g