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Magnetic Field Induced Structural Transitions in 6CHBT-Based Ferronematics

100%

Tomašovičová N., Timko M., Koneracká M., Závišová V., Jadżyn J., Beaugnon E., Chaud X., Kopčanský P.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1276-1278

Ferronematics are stable colloidal suspensions of magnetic particles in nematic liquid crystals. The presence of the magnetic particles enhances the magnetic susceptibility of ferronematics, in comparison with pure liquid crystals. In this work the thermotropic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanato-benzene (6CHBT) and 6CHBT dissolved in phenyl isothiocyanate were doped with spherical magnetic nanoparticles with aim to increase the sensitivity of the liquid crystal on an external magnetic field. The volume concentration of the magnetic particles was 5 × 10^{-4}. The phase transition temperature from isotropic to nematic phase in the external magnetic field up to 12 T was monitored by precise capacitance measurements in the capacitance cells filled with nematic sample as well as with the prepared ferronematic sample. There was no observable shift in the transition temperature in the case of pure 6CHBT, 6CHBT doped with spherical particles and 6CHBT dissolved in phenyl isothiocyanate while in the case of 6CHBT dissolved in phenyl isothiocyanate doped with spherical magnetic particles the shift in the temperature about 9C of the phase transition from isotropic to droplet state at the external magnetic field 12 T was observed.

Structural Phase Transition in Liquid Crystal Doped with Gold Nanoparticles

81%

Kopčanský P., Tomašovičová N., Koneracká M., Timko M., Mitróová Z., Závišová V., Éber N., Fodor-Csorba K., Tóth-Katona T., Vajda A., Jadzyn J., Beaugnon E., Chaud X.

issue 5

988-989

The influence of the inclusion of the dodecanethiol functionalized gold particles (with diameter 3-5 nm) on the structural transitions was investigated. The studied samples were based on the nematic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT). The volume concentration of the gold particles was ϕ_1 = 2 × 10^{-4} and ϕ_2 = 10^{-3}. The obtained results showed that the inclusion of the gold particles in the 6CHBT liquid crystal increases the sensitivity of such system on the external magnetic field.

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2 Acta Physica Polonica A

1 2012

1 2010

2 Beaugnon E.

2 Chaud X.

2 Koneracká M.

2 Kopčanský P.

2 Timko M.

2 Tomašovičová N.

2 Závišová V.

1 Fodor-Csorba K.

1 Jadzyn J.

1 Jadżyn J.

1 Mitróová Z.

1 Tóth-Katona T.

1 Vajda A.

1 Éber N.

Search results

Magnetic Field Induced Structural Transitions in 6CHBT-Based Ferronematics

Structural Phase Transition in Liquid Crystal Doped with Gold Nanoparticles