P. Kopčanský

Institute of Experimental Physics of the Slovak Academy of Sciences

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M. Timko

Slovak Academy of Sciences

283

M. Koneracká

Institute of Experimental Physics of the Slovak Academy of Sciences

140

Natália Tomašovičová

Slovak Academy of Sciences

105

Vlasta Závišová

Institute of Experimental Physics of the Slovak Academy of Sciences

105

Michal Rajňák

Institute of Experimental Physics of the Slovak Academy of Sciences

J. Kováč

Institute of Experimental Physics of the Slovak Academy of Sciences

Jan Jadżyn

Polish Academy of Sciences

Peter Bury

University of Žilina

Martina Kubovčíková

Slovak Academy of Sciences

L. Tomčo

Technical University of Košice

Cooperative Institutions

Slovak Academy of Sciences

138

Institute of Experimental Physics of the Slovak Academy of Sciences

103

Technical University of Košice

Joint Institute for Nuclear Research

University of Pavol Jozef Šafárik

Uzhhorod National University

Comenius University Bratislava

Czech Academy of Sciences, Institute of Physics

Taras Shevchenko National University of Kyiv

National Academy of Sciences of Ukraine

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Intrinsic viscosity and related parameters of PEOX aqueous solutions

AIP conference proceedings (2015)

Jana Tóthová Katarína Paulovičová P. Kopčanský M. Timko V. Lisý

Poly(2-ethyl-2-oxazoline) (PEOX) is a polymer used in many applications. In this work we present the steady-state shear viscosity experiment on low-concentrated high-molecular PEOX aqueous solutions near the presumed theta temperature. In the interpretation of these experiments we consider the polymer being partially permeable to water, with a finite draining parameter h, contrary to the usual approach when the polymer coil is assumed to be impermeable and h approaches the infinite value. By this way we have determined important polymer parameters, such as the gyration and hydrodynamic radii. The calculated Huggins coefficient kH was compared to its value extracted from the measured intrinsic viscosity. We have found that at the temperature 20°C the theoretically predicted kH(h) agrees with the experiment. Since the theory is built for the theta condition, we propose that the theta temperature for PEOX is notably lower than 25°C known from the previous studies. This finding is supported by our measurements of the dependence of the intrinsic viscosity on the PEOX molecular weight.

Gyration

Volume viscosity

10.1063/1.4938464

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Magnetic Nanoparticles Change the Properties of Traditional Materials and Open up New Application Possibilities

CRC Press eBooks (2023)

P. Kopčanský Lucia Balejčíková Matúš Molčan Oliver Štrbák Ivo Šafařı́k

In recent years, development of magnetic nanoparticles has been in the forefront of material research and development. Researchers have increasingly become interested in new ways of preparation, modification and characterization of magnetic nanoparticles. Using external fields has become extremely important. Various methods have been developed to reach a better quality of samples for further application in technology. This chapter discusses magnetic fluids and their composite systems as bioinspired magnetic nanoparticles, textiles, fibers, transformer oil based magnetic fluids or liquid crystals. The described materials and processes have a great application potential in biomedicine and techniques.

10.1201/9781003274247-11

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Structuralization of Magnetic Nanoparticles Induced by Laser Heating in Magnetic Fluids

International Journal of Thermophysics (2009)

P. Kopčanský M. Timko L. Tomčo M. Koneracká J. Štelina

Kerosene

Ferrofluid

10.1007/s10765-009-0693-0

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Citations (1)

Radiation Stability of the BSA Modified Biocompatible Magnetic Fluid

Acta Physica Polonica A (2014)

Natália Tomašovičová Ivan Haysak J. Kováč Martina Kubovčíková Vlasta Závišová

The aim of the presented work was to investigate the stability of biocompatible magnetic uid, i.e. water-based magnetic uid containing magnetite nanoparticles stabilized by surfactant sodium oleate and modied by bovine serum albumin (BSA) after electron irradiation.Samples with the same concentration of Fe3O4 but dierent mass ratio BSA/Fe3O4 (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/Fe3O4 ratio of 0.25 and less than 5% in the samples with w/w BSA/Fe3O4 ratio of 1 and 2.5.

Biocompatible material

10.12693/aphyspola.126.262

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Citations (2)

γ-Radiation induced sedimentation of magnetic particles in magnetic fluids

Journal of Magnetism and Magnetic Materials (1990)

P. Kopčanský J. Černák T. Tima A. Zentko M. Timko

Ferrofluid

Sedimentation

Kerosene

10.1016/0304-8853(90)90030-t

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Citations (4)

DC and AC dielectric properties transformer oil based magnetic fluid

TechConnect Briefs (2009)

F. Herchl M. Koneracká P. Kopčanský K. Marton M. Timko

The development of electric breakdown in magnetic fluids (MFs) has been analyzed. MFs have been consisted of magnetic particles (Fe3O4) of nanometric size, coated with oleic acid as a surfactant, dispersed in transformer oil. The electro9physical processes, which appear at action of the DC and AC electric field and constant magnetic field on MFs, were observed. These processes have effect on electric breakdown.

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Influence of synthesis temperature on structural and magnetic properties of magnetoferritin

Mendeleev Communications (2019)

Lucia Balejčíková J. Kováč Vasil M. Garamus М. В. Авдеев V. I. Petrenko

Zeta potential

Denaturation (fissile materials)

Thermal Stability

10.1016/j.mencom.2019.05.012

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Citations (6)