Showing papers by "Jan Jadżyn published in 2017"
TL;DR: It results from the presented experimental data that among all the diversity of intermolecular hydrogen-bonded structures existing in liquid water, predominant are the polar entities, i.e. the structures which more or less resemble the chains.
Abstract: The main objective of this paper is to find a source of anomalously high value of the equilibrium permittivity of water. The source is identified to be the unusually high deformation polarizability. The conclusion follows from the analysis of the behavior of the orientational entropy increment induced by an external electric field applied to the liquids belonging to the homologous series of hydroxyl compounds H(CH2)nOH at the end of which water is located. The finding reflects the "indecision" of water about its dielectric relationship with the alcohol family: the value of the permittivity of water absolutely does not fit into alcohols (is too high), while the dipolar orientation effects (which normally determine the permittivity level) fit into alcohols quite well. It results from the presented experimental data that among all the diversity of intermolecular hydrogen-bonded structures existing in liquid water, predominant are the polar entities, i.e. the structures which more or less resemble the chains. Otherwise, the dipolar orientational effects would behave in a quite different way than what is observed in the experiment. The result is convergent with the conclusion of Wernet et al., based on the high-performance X-ray studies of water (Science, 2004).
13 citations
TL;DR: In this article, the structural transitions in ferronematic samples were observed by capacitance measurements in a capacitor made of indium-tin-oxide-coated glass electrodes in combined electric and magnetic fields.
Abstract: This work is devoted to the study of composite systems of the liquid crystal 4-n-hexyl-4-cyanobiphenyl (6CB) doped with differently shaped magnetite nanoparticles. The ferronematic samples were prepared with the volume concentration of φ =10-5 of spherical, as well as of rod-like magnetic particles. The structural transitions in ferronematic samples were observed by capacitance measurements in a capacitor made of indium-tin-oxide-coated glass electrodes in combined electric and magnetic fields.
5 citations
TL;DR: In this paper, it was shown that the alternation of the melting points of 3 n -crown- n retains its amplitude within a large range of the number of oxygen atoms (n ǫ = 4-8) in the crown's ring.
4 citations
TL;DR: It is demonstrated that by doubling the concentration of the magnetic nanoparticles, the range of the dc bias magnetic field to which the ferronematic is sensitive without saturation can be increased by about two orders of magnitude.
Abstract: We report on experimental studies focusing on the dynamic ac magnetic susceptibility of a ferronematic. It has been shown recently, that in the isotropic phase of a ferronematic, a weak dc bias magnetic field of a few oersteds increases the ac magnetic susceptibility. This increment vanishes irreversibly if the substance is cooled down to the nematic phase, but can be reinduced by applying the dc bias field again in the isotropic phase [Tomasovicova, N. et al. Soft Matter 2016, 12, 5780–5786]. The effect has no analogue in the neat host liquid crystal. Here, we demonstrate that by doubling the concentration of the magnetic nanoparticles, the range of the dc bias magnetic field to which the ferronematic is sensitive without saturation can be increased by about two orders of magnitude. This finding paves a way to application possibilities, such as low magnetic field sensors, or basic logical elements for information storage.
4 citations
TL;DR: In this article, it was shown that the replacement of the hydrogen atom in CH3 group of ethanol by hydroxyl ( OH) or amino ( NH2) moieties, leads to an opposite change in molar volume of the formed new compounds (1,2-ethanediol and 2-aminoethanol), in comparison to the molar volumetric volume of ethanol.
4 citations
TL;DR: Low Magnetic Field Response in Ferronematics V. Gdovinováa,∗, N. Tomašovičová, V. Závišová as mentioned in this paper, Tóth-Katona, F. Jamon, Jadzyn and P. Smoluchowskiego 17, 60-179 Poznań, Poland
Abstract: Low Magnetic Field Response in Ferronematics V. Gdovinováa,∗, N. Tomašovičová, V. Závišová, N. Éber, T. Tóth-Katona, F. Royer, D. Jamon, J. Jadzyn and P. Kopčanský Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary Université de Saint Etienne, Saint Etienne, France Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
1 citations
TL;DR: In this paper, a thermotropic nematic liquid crystal 4-trans-4′-n-hexyl-cyclohexyl hexyl-isothiocyanato-benzene (6CHBT) was dissolved in phenylisothIocyanate and doped with spherical magnetic particles with volume concentration φ1 = 10 −4 and φ2 = 10−3.
Abstract: In this work the thermotropic nematic liquid crystal 4-trans-4′-n-hexyl-cyclohexyl-isothiocyanato-benzene (6CHBT) was dissolved in phenyl-isothiocyanate and doped with spherical magnetic particles with volume concentration φ1 = 10−4 and φ2 = 10−3. The influence of the volume concentration on the phase transitions from isotropic to nematic phase was studied by three experimental methods: optical microscopy, differential scanning calorimetry, and dielectric measurements. The obtained results confirmed the coexistence of isotropic and nematic phase, i.e. nematic or ferronematic droplets in isotropic phase in a wide temperature range between nematic and isotropic phase.