Showing papers by "Jan Jadżyn published in 1997"
TL;DR: In this article, a dielectric relaxation study for the liquid crystal 4-isothiocyanatophenyl 4-hexylbicyclo[2, 2,2,2] octane-1carboxylate in the nematic and isotropic phases has been carried out in the frequency range from 1 kHz to 1 GHz.
7 citations
TL;DR: In this article, the magnetic Fredericksz transition in ferronematics (thermotropic nematic liquid crystals 7CB and MBBA combined with fine magnetic particles of size 10 nm) was studied by using simple dielectric measurements.
Abstract: The magnetic Fredericksz transition in ferronematics (thermotropic nematic liquid crystals 7CB and MBBA combined with fine magnetic particles of size 10 nm) as a function of concentration of magnetic particles was studied by using simple dielectric measurements. The increase of the threshold magnetic field is observed in 7CB based ferronematic while the decrease of threshold field in MBBA based ferronematic is observed when the concentration of magnetic particles is increased. Experimental results are disscussed in framework of Brochard, de Gennes and Burylov, Raikher theories.
5 citations
TL;DR: In this paper, the magnetic Fredericksz trannsition in ferronematics (thermotropic nematic liquid crystals 7CΒ and MBBA combined with fnie magnetic particles of a size 10 nm) as a function of concentration of magnetic particles was studied by using simple dielectric measurements.
Abstract: The magnetic Fredericksz trannsition in ferronematics (thermotropic nematic liquid crystals 7CΒ and MBBA combined with fnie magnetic particles of a size 10 nm) as a function of concentration of magnetic particles was studied by using simple dielectric measurements. The increase of the threshold magnetic field is observed in 7CΒ based ferronematic while the decrease of threshold field in MBBA based ferronematic is observed when the concentration of magnetic particles is increased. Experimental results are discussed in the framework of Brochard, de Gennes and Burylov, Raikher theories. PACS numbers: 64.70.Md, 61.30.Gd
3 citations
TL;DR: In this paper, the high pressure phase behavior of a new liquid crystal, belonging to the series l-[4-«-alkylbiphenyl]-2]-4-isothio-cyanato-phenyl] ethane (nTPEB), n = 6, has been studied with differential thermal analysis.
Abstract: Abstract The high pressure phase behaviour of a new liquid crystal, belonging to the series l-[4-«-alkylbiphenyl]-2-[4-isothio-cyanato-phenyl] ethane (nTPEB), n = 6, has been studied with differential thermal analysis. The pressure dependence of the phase transitions has been determined up to 300 MPa. No pressure-induced or pressure-limited phases are observed in this pressure range, the phase behaviour, however, depends on the thermal treatment. Enthalpy and volume changes accompanying the phase transitions have been calculated using the Clausius-Clapeyron equation.