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1
Content available remote

Structural Changes in Deformed Soft Magnetic Ni-Based Metallic Glass

100%
Juríková A., Csach K., Miškuf J., Ocelík V.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
393-395
EN
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.
2
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Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

100%
Miškuf J., Csach K., Juríková A.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1273-1275
EN
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.
3
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Influence of Plastic Deformation on Nanocrystallization of Finemet Alloy

100%
Csach K., Miškuf J., Juríková A., Janák G.
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issue 5
820-822
EN
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.
4
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Creep Behaviour of Co-Based Amorphous Alloys

100%
Csach K., Miškuf J., Juríková A., Vojtaník P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
91-94
EN
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.
5
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Structural Relaxation of Ni-Si-B Amorphous Ribbon

100%
Juríková A., Csach K., Miškuf J., Ocelík V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
99-102
EN
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.
6
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Nanoscale Fracture Morphologies of Soft Magnetic CoFeTaB Amorphous Alloy

100%
Miškuf J., Csach K., Juríková A., Huráková M.
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vol. 126
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issue 1
96-97
EN
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.
7
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Influence of Plastic Deformation on Devitrification of Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9} Amorphous Alloy

100%
Csach K., Miškuf J., Juríková A.
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vol. 126
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issue 1
98-99
EN
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.
8
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Fragmentation of Co-Fe-Ta-B Soft Magnetic Amorphous Alloy

88%
Miškuf J., Csach K., Juríková A., Huráková M., Tabachnikova E.
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EN
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.
9
Content available remote

Low Temperature Failure of Al_{90}Fe_7Ta_3 Amorphous Alloys

76%
Miškuf J., Csach K., Juríková A., Bengus V., Tabachnikova E., Shumilin S., Podolskiy A.
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issue 5
823-824
EN
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.
10
Content available remote

Thermal Analysis of Magnetic Nanoparticles Modified with Dextran

76%
Juríková A., Csach K., Miškuf J., Koneracká M., Závišová V., Kubovčíková M., Kopčanský P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1296-1298
EN
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.
11
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Thermogravimetric Study of the Decomposition of BSA-Coated Magnetic Nanoparticles

76%
Csach K., Juríková A., Miškuf J., Koneracká M., Závišová V., Kubovčíková M., Kopčanský P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1293-1295
EN
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.
12
Content available remote

Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons

76%
Miškuf J., Csach K., Juríková A., Janák G., Švec T., Konč M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
95-98
EN
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.
13
Content available remote

Thermal Analysis of Magnetic Polymer Nanospheres for Drug Targeting

76%
Juríková A., Csach K., Miškuf J., Koneracká M., Závišová V., Kopčanský P.
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issue 5
990-992
EN
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.
14
Content available remote

Structural Stability of Amorphous Alloy of Modified Finemet Type

76%
Huráková M., Csach K., Juríková A., Miškuf J., Rajňák M., Ďurišin M., Kvačkaj T.
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EN
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.
15
Content available remote

Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles

64%
Csach K., Juríková A., Miškuf J., Tomašovičová N., Gdovinová V., Závišová V., Kopčanský P., Éber N., Fodor-Csorba K., Vajda A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
949-951
EN
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.
16
Content available remote

Thermal Stability of Bent-Core Liquid Crystals Doped with Magnetic Nanoparticles

52%
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.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
638-640
EN
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.
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