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Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases

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Kolek Ł., Massalska-Arodź M., Majda D., Suchodolska B., Zalewski S.

Acta Physica Polonica A

2013

vol. 124

issue 6

909-912

Based on the results of the differential scanning calorimetry, of transmitted light intensity measurements and of texture observations the phase diagram of 4-(6-heptafluorobutanoiloxyhexyloxy)biphenyl-4'-carboxylate(S)-4-(methyloheptyloxy-1-carbonyl)-phenyl (4H6) was obtained. The following phases were identified on cooling: isotropic, smectic A, smectic C*, smectic C*_{A} phases and a highly ordered phase called SmX and its glass. During heating transformation from glass of SmX to SmX phase and then transition to a metastable Cr2 phase, evolving to the more stable Cr1 phase, were observed. On further heating SmC*_{A}, SmC* and Sm phases were identified. When Cr2 was cooled, a glass transition was also observed.

Thermal Stability of Bent-Core Liquid Crystals Doped with Magnetic Nanoparticles

100%

Juríková A., Csach K., Miškuf J., Tomašovičová N., Mitróová Z., Závišová V., Koneracká M., Kopčanský P., Timko M., Éber N., Fodor-Csorba K., Vajda A.

Acta Physica Polonica A

2015

vol. 127

issue 2

638-640

In the work phase transitions in bent-core liquid crystals were studied using differential scanning calorimetry. For the binary mixture of bent-core molecules with 50 wt% of rod-shaped compound, the nematic to smectic transition occured below 40°C and the crystallization temperature shifted to sub-ambient temperatures. The influence of doping of the bent-core liquid crystals with magnetic nanoparticles on the kinetics of observed phase transitions was studied. The phase transition temperatures were shifted depending on the nanoparticle type and changed with varying cooling rate for all studied liquid crystal samples.

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

100%

Csach K., Juríková A., Miškuf J., Tomašovičová N., Gdovinová V., Závišová V., Kopčanský P., Éber N., Fodor-Csorba K., Vajda A.

Acta Physica Polonica A

2017

vol. 131

issue 4

949-951

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.

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3 Acta Physica Polonica A

1 2017

1 2015

1 2013

2 Csach K.

2 Fodor-Csorba K.

2 Juríková A.

2 Kopčanský P.

2 Miškuf J.

2 Tomašovičová N.

2 Vajda A.

2 Závišová V.

2 Éber N.

1 Gdovinová V.

1 Kolek Ł.

1 Koneracká M.

1 Majda D.

1 Massalska-Arodź M.

1 Mitróová Z.

1 Suchodolska B.

1 Timko M.

1 Zalewski S.

Search results

Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases

Thermal Stability of Bent-Core Liquid Crystals Doped with Magnetic Nanoparticles

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