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 |
| Full Text PDF |
| 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 |