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Wyświetlanie 1-15 z 16
Tytuł:
How to Enhance Sensitivity of Liquid Crystals to External Magnetic Field?
Autorzy:
Kopčanský, P.
Tomašovičová, N.
Gdovinová, V.
Timko, M.
Éber, N.
Tóth-Katona, T.
Jadzyn, J.
Honkonen, J.
Chaud, X.
Powiązania:
https://bibliotekanauki.pl/articles/1383988.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
Liquid crystals, due to their large dielectric anisotropy, respond very sensitively to application of an external electric field, whereas they are only weakly sensitive to the magnetic field. A possible way of improving that sensitivity is doping liquid crystals with magnetic nanoparticles. As a result, stable colloidal suspensions of liquid crystals with relatively low concentrations of magnetic nanoparticles (called ferronematics, ferrocholesterics, ferrosmectics, etc.) can be produced. We illustrate some examples of the influence of the magnetic field, as well as of a superposition of magnetic and electric fields on the structural transitions (e.g. on the Fréedericksz transition) in ferronematics based on the calamitic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT). It is shown that the samples respond to the applied magnetic field of low strength. The effects of the magnetic particles and magnetic field on the nematic to isotropic phase transition temperature are discussed as well.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 157-162
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Magnetic Particles on the Nematic Droplets Formation in Liquid Crystal
Autorzy:
Majorošová, J.
Gdovinová, V.
Tomašovičová, N.
Juríková, A.
Závišová, V.
Jadzyn, J.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032205.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
67.30.Hm
Opis:
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.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 955-957
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Magnetic Field Response in Ferronematics
Autorzy:
Gdovinová, V.
Tomašovičová, N.
Závišová, V.
Éber, N.
Tóth-Katona, T.
Royer, F.
Jamon, D.
Jadzyn, J.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1031035.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
In this work the 4-n-hexyl-4'-cyanobiphenyl liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements. Influence of the shape of magnetic particles on magnetic Fréedericksz transition depends on the type of anchoring, which is characterized by the density of the anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. It was observed that in the case of doping with spherical particles, the critical magnetic field is shifted to higher values with increase of volume concentration of the magnetic nanoparticles but decreases with increase of biasing voltage. In the case of doping with rod-like particles, the critical magnetic field is almost independent of the volume concentration of the magnetic nanoparticles.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 934-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lysozyme Amyloid Fibrils Doped by Carbon Nanotubes
Autorzy:
Majorošová, J.
Tomašovičová, N.
Mitróová, Z.
Rajňák, M.
Girman, V.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030498.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
68.37.Lp
68.37.-d
75.60.Ej
87.14.Ee
Opis:
Production of new composites for the creation of modern materials with desired properties is the key feature of nanotechnology. Despite the well known advantages of magnetic nanoparticles, the aim of the present study was to synthesize lysozyme amyloid fibrils from hen egg white and subsequently doped this solution with single walled carbon nanotubes and with the magnetite Fe₃O₄ labelled single walled carbon nanotubes. Transmission electron microscopy and polarization optical microscopy were used to obtain the structural and dimensional information about samples. Measurements of magnetic properties indicate the considerable increase of the saturation magnetization for solutions included the magnetite nanoparticles.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 588-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles
Autorzy:
Csach, K.
Juríková, A.
Miškuf, J.
Tomašovičová, N.
Gdovinová, V.
Závišová, V.
Kopčanský, P.
Éber, N.
Fodor-Csorba, K.
Vajda, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032719.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.mj
65.80.-g
Opis:
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.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 949-951
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Carbon Nanotubes
Autorzy:
Jeníková, M.
Zakuťanská, K.
Kováč, J.
Girman, V.
Kopčanský, P.
Tomašovičová, N.
Powiązania:
https://bibliotekanauki.pl/articles/1032760.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
74.25.nd
68.37.Lp
75.75.-c
Opis:
The aim of the presented work was to characterize single-walled carbon nanotubes as well as multi-walled carbon nanotubes by transmission electron microscopy, the Raman spectroscopy and magnetization measurements to obtain information about their size, structure, and magnetic properties. We show that having different carbon nanotubes one can easily distinguish the single-wall or multi-wall carbon nanotubes and determine their quality. The obtained results show that carbon nanotubes can be diamagnetic or ferromagnetic depending on their structural parameters.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 952-954
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of 6CHBT Liquid Crystal Doped with Ferroelectric or Magnetic Particles to Electric and Magnetic Fields
Autorzy:
Majorošová, J.
Tomašovičová, N.
Timko, M.
Koneracká, M.
Studenyak, I.
Kovalchuk, O.
Kovalchuk, S.
Jadżyn, J.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1368661.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
64.70.Md
Opis:
Introduction of ferroelectric or magnetic nanoparticles into nematic liquid crystal is a promising method for the improvement of the electro-optic or magneto-optic properties of different nematic liquid crystals by non-chemical way. This work is devoted to the study of composite systems of liquid crystal with spherical ferroelectric or magnetic particles with the aim to study their sensitivity to electric and magnetic fields. The nematic 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) liquid crystal was doped with SbSI ferroelectric particles or with $Fe_{3}O_{4}$ magnetic particles. The structural transitions in ferronematic samples were indicated by capacitance measurements in a capacitor made of ITO-coated glass electrodes in combined electric and magnetic fields. The obtained results showed the increase of the shift in critical voltage with increasing magnetic field in both kinds of samples.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 260-261
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Anchoring Energy of Liquid Crystal Molecules to Magnetic Particles in HAB-Based Ferronematics
Autorzy:
Tomašovičová, N.
Koneracká, M.
Kopčanský, P.
Timko, M.
Závišová, V.
Vajda, A.
Fodor-Csorba, K.
Éber, N.
Tóth-Katona, T.
Jadzyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813941.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
In this work we describe the magnetic Freedericksz transition in HAB-based (4, 4'-di-n-heptylazoxybenzene) ferronematics. The ferronematic samples were prepared with two different volume concentrations of magnetic particles $φ_1 = 2×10^{-5}$ and $φ_2 = 2×10^{-4}$. The liquid crystal HAB is nematic at the temperatures from ≈53°C to 70°C and smectic A at the temperatures under 53°C. The anisotropy of dielectric permitivity of HAB liquid crystal is positive in nematic phase and negative in smectic A phase. The magnetic Fredericksz transition was studied in nematic phase at temperature 60°C.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 591-594
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structural Phase Transitions in 6CB-Based Ferronematics
Autorzy:
Tomašovičová, N.
Koneracká, M.
Kopčanský, P.
Timko, M.
Závišová, V.
Tomčo, L.
Jadżyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1810567.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
The structural transitions in ferronematics based on the thermotropic nematic liquid crystal 4-cyano-4'-hexylbiphenyl were studied. The ferronematic samples were prepared by doping with magnetic suspension consisting of $Fe_3O_4$ particles (10 nm in diameter) coated with oleic acid as a surfactant with different volume concentrations of magnetic particles (from $10^{-5}$ to $10^{-3}$). Freedericksz transitions were studied in combined electric and magnetic fields. The experimental results indicated soft anchoring with perpendicular initial orientation between the magnetic moment of the magnetic particles and director.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 336-338
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Induced Structural Transitions in 6CHBT-Based Ferronematics
Autorzy:
Tomašovičová, N.
Timko, M.
Koneracká, M.
Závišová, V.
Jadżyn, J.
Beaugnon, E.
Chaud, X.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1428990.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
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.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1276-1278
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stability of Bent-Core Liquid Crystals Doped with Magnetic Nanoparticles
Autorzy:
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.
Powiązania:
https://bibliotekanauki.pl/articles/1387994.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.mj
65.80.-g
Opis:
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.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 638-640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Phase Transition in Liquid Crystal Doped with Gold Nanoparticles
Autorzy:
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.
Powiązania:
https://bibliotekanauki.pl/articles/1535052.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
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.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 988-989
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic-Field Induced Isotropic-Nematic Phase Transition in PDLC Doped with Magnetic Nanoparticles
Autorzy:
Mitróová, Z.
Tomašovičová, N.
Timko, M.
Koneracká, M.
Tomčo, L.
Jadżyn, J.
Palewski,, T.
Kopčanský, P.
Kovalchuk, O.
Powiązania:
https://bibliotekanauki.pl/articles/1429068.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Gd
75.30.Hx
75.75.Fk
77.84.Nh
Opis:
The paper presents a study of the polymer dispersed liquid crystals that consist of liquid crystal 4-trans-4'-n-hexyl-cyclohexyl-isothiocyanatobenzene (6CHBT) microdroplets dispersed in polyvinyl alcohol and doped with various kinds of magnetic particles. As magnetic nanoparticles there were used single walled carbon nanotubes and magnetite labeled single walled carbon nanotubes. The volume concentration of the particles was 2 × $10^{-3}$. Magnetic properties were investigated by a SQUID magnetometer. The higher saturation magnetization has been achieved in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes. The phase transition temperature from isotropic to nematic phase at the external magnetic field 0 T and 12 T was monitored by precise capacitance measurements in the capacitance cell filled with prepared sample. The significant shift of the phase transition temperature (0.2°C) at the external magnetic field 12 T has been observed in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1299-1301
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Stability of the BSA Modified Biocompatible Magnetic Fluid
Autorzy:
Tomašovičová, N.
Haysak, I.
Kováč, J.
Kubovčíková, M.
Závišová, V.
Timko, M.
Okunev, A.
Zorkovská, A.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1368667.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
64.70.Md
Opis:
The aim of the presented work was to investigate the stability of biocompatible magnetic fluid, i.e. water-based magnetic fluid containing magnetite nanoparticles stabilized by surfactant sodium oleate and modified by bovine serum albumin (BSA) after electron irradiation. Samples with the same concentration of $Fe_{3}O_{4}$ but different mass ratio BSA/$Fe_{3}O_{4}$ (w/w=0.25, 1.0 and 2.5) were studied. The electron irradiation caused about 10% reduction of the saturation magnetization in the samples with w/w BSA/$Fe_{3}O_{4}$ ratio of 0.25 and less than 5% in the samples with w/w BSA/$Fe_{3}O_{4}$ ratio of 1 and 2.5.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 262-263
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Biocompatible Magnetic Fluid after Electron Irradiation
Autorzy:
Tomašovičová, N.
Haysak, I.
Koneracká, M.
Kováč, J.
Timko, M.
Závišová, V.
Okunev, A.
Parlag, A.
Fradkin, A.
Sakhno, V.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429089.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.80.Fe
61.82.Rx
Opis:
The magnetic particles in the water-based magnetic fluids were sterically stabilized by natrium oleate to prevent their agglomeration and consequently the adsorption of poly-ethylene-glycol (PEG) was carried out to improve the biocompatibility of the magnetic particles. Two sets of samples were prepared. The first set of the samples was with different molar weight of PEG (Mw = 400, 1000, 10000 and 20000) at the constant weight ratio of PEG/$Fe_3O_4$ = 0.25 and the second one was with different weight ratio of PEG/$Fe_3O_4$ and constant molar weight of PEG (Mw = 1000). The samples were irradiated with 20 Gy. The same reduction of saturated magnetization (about 10%) after electron irradiation with 20 Gy was observed for all prepared samples.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1302-1304
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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