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    Wyświetlanie 1-19 z 19
    Tytuł:
    Influence of Plastic Deformation on Devitrification of $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ Amorphous Alloy
    Autorzy:
    Csach, K.
    Miškuf, J.
    Juríková, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367306.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The method of thermogravimetry in external magnetic field was modified using square wave alternate magnetic field for an estimation of the temperature dependence of the magnetization. This method was used for the study of influence of plastic deformation of the amorphous alloy $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ on the structural changes.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 98-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428973.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The influence of the intensive plastic deformation on the structure of ferromagnetic amorphous alloys has been studied by means of thermoanalytical methods. It was shown that the work of plastic deformation led to the local heating in thin shear band layers and the dissipation of the energy caused structural changes in the region outside these bands. The plastic deformation influences the structure of the alloys and their structural sensitive magnetic properties.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1273-1275
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Plastic Deformation on Nanocrystallization of Finemet Alloy
    Autorzy:
    Csach, K.
    Miškuf, J.
    Juríková, A.
    Janák, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534051.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The Finemet alloy prepared by the crystallization of an amorphous precursor is a basic model material for study of magnetic nanoparticle structures. Intensive plastic deformation localized in adiabatic shear bands causes the intensive heating and structural changes in the amorphous alloy. These changes influence the magnetic properties of the amorphous precursor for the Finemet crystallization.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 820-822
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Relaxation of Ni-Si-B Amorphous Ribbon
    Autorzy:
    Juríková, A.
    Csach, K.
    Miškuf, J.
    Ocelík, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813536.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The structural relaxation of the Ni-Si-B amorphous ribbon was studied by means of differential scanning calorimetry and thermomechanical analysis. It was shown that considerable length changes associated with reversible structural relaxation were revealed after a previous creep applied at higher temperatures.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 99-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creep Behaviour of Co-Based Amorphous Alloys
    Autorzy:
    Csach, K.
    Miškuf, J.
    Juríková, A.
    Vojtaník, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813534.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The detailed study of the temperature dependence of the viscosity of (Co, Fe)-(Si, B) amorphous metallic alloys up to crystallization temperatures was carried out. The kinetics of the non-equilibrium viscosity was described using Vogel-Fulcher-Tammann law below the glass transition temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 91-94
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Changes in Deformed Soft Magnetic Ni-Based Metallic Glass
    Autorzy:
    Juríková, A.
    Csach, K.
    Miškuf, J.
    Ocelík, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810607.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The effects of intensive plastic deformation of the soft magnetic metallic glass Ni-Si-B on the structural relaxation were examined. The enthalpy changes studied by differential scanning calorimetry revealed that the intensive plastic deformation was associated with the partial structural relaxation of the amorphous structure.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 393-395
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanoscale Fracture Morphologies of Soft Magnetic CoFeTaB Amorphous Alloy
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Huráková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367300.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.25.Mn
    Opis:
    We analyzed the failure characteristics of the bulk metallic glass $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ (at.%) deformed by compression and by bending of the ribbons. Under the load the amorphous structure can store high elastic energy. The surface morphology of nanoscale fracture is in accord with the micromechanisms of the failure of the amorphous structure. The fracture surface consists of a smooth mirror cleavage zone and a river pattern zone with nanosized dimples, arranged in lines respecting the periodic corrugation zones, oriented perpendicular to the crack propagation direction. The presence of the failure initiation centers in the ribbon influences the dynamics of crack propagation and also the surface morphology of the fracture.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 96-97
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fragmentation of Co-Fe-Ta-B Soft Magnetic Amorphous Alloy
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Huráková, M.
    Tabachnikova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387048.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.25.Mn
    Opis:
    The main limitation of high-strength Co-based bulk metallic glasses for their application as structural materials is the large brittleness. Spontaneously emerging cracks in the alloy degrade the magnetic properties. We analyzed the failure characteristics of $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ bulk soft magnetic metallic glass deformed in the compression at room temperature and the low strain rate. Under loading the amorphous structure stores high elastic energy. During the failure this energy is released and the alloy breaks into small particles or powder exhibiting a fragmentation mode.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 558-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Encapsulated Magnetite in PLGA Nanospheres
    Autorzy:
    Koneracká, M.
    Závišová, V.
    Timko, M.
    Kopčanský, P.
    Tomašovičová, N.
    Csach, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813943.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Rv
    75.50.Mm
    87.83.+a
    Opis:
    In this study, the biocompatible magnetic fluid was encapsulated in biodegradable polymer PLGA (poly D, L/lactide-co-glycolide acid) by the nanoprecipitation method. We characterized these spheres in terms of morphology, magnetite content and magnetic properties. The results showed good encapsulation with magnetite content 22wt% and magnetization 3.4 mT. The transmission electron microscopy and scanning electron microscopy images showed that magnetic particles have almost a spherical shape with approximate size 250 nm. Infrared spectroscopy and thermogravimetric analysis measurements were used to confirm incorporation of magnetic particles into the PLGA polymer.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 595-598
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Analysis of Magnetic Polymer Nanospheres for Drug Targeting
    Autorzy:
    Juríková, A.
    Csach, K.
    Miškuf, J.
    Koneracká, M.
    Závišová, V.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535061.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    65.80.-g
    47.63.mh
    Opis:
    Poly(D,L-lactic-co-glycolic) acid (PLGA) polymer nanospheres loaded with different input amounts of anticancer drug taxol were prepared by the modified nanoprecipitation method. Magnetite was incorporated into the polymer nanospheres to impart them superparamagnetic properties. Thermal properties of the drug loaded magnetic polymer nanospheres were characterized using differential scanning calorimetry and thermogravimetric analysis. The solid state solubility of taxol in PLGA nanospheres and the influence of external magnetic field on their thermal stability were estimated. The investigations have revealed that the samples of dried taxol loaded magnetic PLGA nanospheres undergo mass loss at three stages during heating.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 990-992
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $(Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2$ · $zH_2O$ Complexes
    Autorzy:
    Vavra, M.
    Antoňák, M.
    Jagličić, Z.
    Mihalik, M.
    Csach, K.
    Zentková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535120.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.30.Cr
    Opis:
    Magnetization measurements were performed on the $(Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2$ · $zH_2O$ molecule-based magnets where x=0.0, 0.2, 0.25, 0.3, 0.35 0.4, 0.6, 0.8 and 1.0. Both the Curie temperature and saturated magnetization at first decrease with increasing value of x reaching the minimal value of $T_{C}$ = 49.7 K and 0.17 $μ_{B}$ for x=0.2 and then increase with substitution. The pronounced hysteretic behavior between zero-field cooled and field cooled regimes was observed for all samples. Magnetization changes the sign of magnetic polarization in zero-field cooled magnetization curve at the compensation temperature $T_\text{comp}$ = 16 K for sample with x = 0.4. Our results indicate that the system behaves as mixed-ferri-ferromagnetic system.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 998-999
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Janák, G.
    Švec, T.
    Konč, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813535.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.25.Mn
    Opis:
    Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. The estimated fracture toughness of these materials is closely associated with the scale of the local plastic zone.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 95-98
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermogravimetric Study of the Decomposition of BSA-Coated Magnetic Nanoparticles
    Autorzy:
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Koneracká, M.
    Závišová, V.
    Kubovčíková, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429064.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    65.80.-g
    Opis:
    Magnetic nanoparticles used in biomedicine have to be biocompatible, which can be achieved by the modification of the magnetic particle surface with an appropriate biocompatible substance. In the work protein bovine serum albumin (BSA) was chosen to modify the surface of magnetic nanoparticles. The BSA-coated magnetic nanoparticles with different input weight ratios of BSA to the magnetite $Fe_3O_4$ were prepared and thermally characterized using thermogravimetric and differential scanning calorimetric analysis. The adsorption of BSA on the magnetic nanoparticles in wide range of concentration was confirmed. The activation energies of the thermal decomposition of the complex system were estimated.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1293-1295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Analysis of Magnetic Nanoparticles Modified with Dextran
    Autorzy:
    Juríková, A.
    Csach, K.
    Miškuf, J.
    Koneracká, M.
    Závišová, V.
    Kubovčíková, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429065.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    65.80.-g
    Opis:
    In the work the thermal behaviour of the magnetic nanoparticles modified with polysaccharide dextran of different weight ratios to the magnetite $Fe_3O_4$ was investigated using thermoanalytical methods - differential scanning calorimetry and thermogravimetric analysis. The adsorption of dextran on the magnetic nanoparticles was confirmed and the influence of the dextran amount in the modified magnetic fluid on the thermal decomposition of the complex system was studied. The results showed that magnetite catalyzed the thermal decomposition of dextran, the adsorbed dextran showed lower initial decomposition temperatures in comparison with the free one.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1296-1298
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Stability of Amorphous Alloy of Modified Finemet Type
    Autorzy:
    Huráková, M.
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Rajňák, M.
    Ďurišin, M.
    Kvačkaj, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387067.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    62.20.de
    Opis:
    The Finemet type amorphous alloys are well known as high frequency soft magnetic materials. They have good soft magnetic properties which are characterized by low coercive force and high permeability because of the lack of crystalline anisotropy. The structural stability of the amorphous ribbon of Finemet type modified by Mn, Al and Cr prepared by melt-spinning process was studied using differential scanning calorimetry and dynamical mechanical analysis. With increase of the crystalline portion in the sample, the Curie transition is shifted to the higher temperatures. The magnetic relaxation processes at frequencies above 10⁴ Hz were detected by mass magnetic susceptibility measurement.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 564-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Failure of $Al_{90}Fe_7Ta_3$ Amorphous Alloys
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Bengus, V.
    Tabachnikova, E.
    Shumilin, S.
    Podolskiy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534053.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.mm
    Opis:
    The fractographic analysis was used for the interpretation of ultra-low temperature dependences of yield or fracture stress. Analysis of fracture morphology revealed that dominantly chevron morphology is present and that the failure of this amorphous material initiates at low temperatures at geometrical imperfections of ribbons and these failures are often presented as a premature failure.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 823-824
    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 $Fe_3O_4$ Magnetic Nanoparticles Modified with Dextran and Investigation of Their Interaction with Protein Amyloid Aggregates
    Autorzy:
    Koneracká, M.
    Antošová, A.
    Závišová, V.
    Lancz, G.
    Gažová, Z.
    Šipošová, K.
    Juríková, A.
    Csach, K.
    Kováč, J.
    Tomašovičová, N.
    Fabián, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535048.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    87.14.em
    87.19.xr
    Opis:
    Functionalised magnetic nanoparticles composed of $Fe_3O_4$ particles stabilised by sodium oleate and subsequently modified with dextran (MFDEX) were prepared by the co-precipitation method. Their morphology and particle size distribution were observed by scanning electron microscopy and photon cross correlation spectroscopy. In order to confirm the modification of magnetite surface with dextran physical techniques, including infrared spectroscopy, thermal analysis, and magnetic measurement, were used. Finally, the effect of MFDEX on amyloid fibrillar aggregates of human insulin and hen egg white lysozyme, typical amyloidogenic proteins, was investigated. In vitro interaction of MFDEX with protein amyloid fibrils resulted into destruction of amyloid aggregates. The anti-amyloid activity makes MFDEX of potential interest as therapeutic agent against amyloid-related diseases.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 983-985
    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
      Wyświetlanie 1-19 z 19

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