A5015735274- Magnetic properties of thin films
- Mesoporous Materials and Catalysis
- Theoretical and Computational Physics
- Metallic Glasses and Amorphous Alloys
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Nanoparticle-Based Drug Delivery
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic and transport properties of perovskites and related materials
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetism in coordination complexes
- Advanced Condensed Matter Physics
- X-ray Diffraction in Crystallography
- Magnetic Properties and Applications
- Crystallization and Solubility Studies
- Magnetic Properties of Alloys
- Multiferroics and related materials
- Lanthanide and Transition Metal Complexes
- Optical properties and cooling technologies in crystalline materials
- nanoparticles nucleation surface interactions
- Metal complexes synthesis and properties
- Surface Roughness and Optical Measurements
- Gold and Silver Nanoparticles Synthesis and Applications
- Material Dynamics and Properties
- Minerals Flotation and Separation Techniques
Czech Academy of Sciences, Institute of Physics
2023-2024
University of Pavol Jozef Šafárik
2015-2024
Institute of Physics of the Slovak Academy of Sciences
2015-2024
Technical University of Košice
2015-2020
Joint Institute for Nuclear Research
2020
Institute of Experimental Physics of the Slovak Academy of Sciences
2009
Czech Academy of Sciences, Institute of Inorganic Chemistry
2008-2009
Slovak Academy of Sciences
2009
The study presents a series of examples magnetic nanoparticle systems designed for the diagnosis viral diseases. In this interdisciplinary work, we describe one most comprehensive synthetic approaches preparation and functionalization smart rapid effective RT-PCR diagnostics isolation RNA. Twelve different organic ligands inorganic porous silica were used surface Fe3O4 core to increase number active centres efficient RNA binding from human swab samples. Different with common beads...
The magnetocaloric properties of a composite material consisting isolated Gd2O3 nanoparticles with diameter 6–8 nm embedded in the pores mesoporous silica matrix have been studied. fascinating nanostructure and composition were properly characterized by small angle X-ray scattering, absorption near edge structure, TEM. Almost ideal paramagnetic behavior was observed temperature range 1.8–300 K. When compared to various nanosystems, presented exhibits an extraordinarily large magnetic entropy...
A stimuli-responsive drug delivery system consisting of mesoporous silica with its surface modified by p-coumaric acid derivatives (CA) as photo-switchable ligands was studied for the non-steroidal anti-inflammatory (NSAID) naproxen. For this purpose, MCM-41 material prepared and post-synthetically grafting a triethoxysilyl derivative acid, which undergoes reversible photo-dimerization under UV irradiation creates "valves" on allowing targeted opening/closing pores. Naproxen encapsulated...
Abstract A drug delivery system based on mesoporous particles MCM-41 was post-synthetically modified by photo-sensitive ligand, methyl-(2E)-3-(4-(triethoxysilyl)-propoxyphenyl)-2-propenoate (CA) and the pores of were loaded with Naproxen sodium salt (NAP). The CA used as a photoactive molecule that can undergo reversible photo-dimerization [2π + 2π] cycloaddition when irradiated UV light specific wavelengths. Thus, it has function gate-keeper is responsible for opening/closing minimizing...
We report the synthesis of fine (∼ 5 nm) citric acid capped CoFe2O4 (CA-CoFe2O4) nanoparticles by coprecipitation method at different pH conditions that changes gradually from 6 to 11. Structural and magnetic characterization performed TEM, XRD SQUID confirm under lower (6 9) leads formation shell covering individual nanoparticles. Capping layer increases inter-particle distance what results in decrease interaction strength. On other hand, higher (10 11) apparently hampers proper that,...
One-dimensional (1D) chain-like nanocomposites, created by ensembles of nanoparticles with diameter ∼ 13 nm, which are composed an iron core (∼4 nm) and a silica protective layer, were prepared self-assembly process. Chain-like Fe@SiO2 formed due to strong magnetic dipole–dipole interactions between individual Fe the subsequent fixation particles SiO2 layers. X-ray near edge absorption spectra measurements at K confirm that presence layer prevents oxidation core. Strong cores lead long-range...
Abstract Magnetic properties of three variants MOF-76(Gd), {[Gd(BTC)(H 2 O)]·G} n (BTC = benzene-1,3,5-tricarboxylate, G guest molecules) were investigated by static susceptibility, isothermal magnetization and specific heat capacity measurements. In the study we used as synthesized MOF-76(Gd)-DMF ( 1 ) (G DMF dimethylformamide), containing molecules in cavity system, compound MOF-76(Gd) ), activated complex without solvents cavities water exchanged sample MOF-76(Gd)-H O 3 ). A pronounced...
Producing defect-free and durable coatings that can withstand elevated annealing temperatures is important when preparing soft magnetic composites. A mechanical surface smoothing method was employed on water atomized Fe powder as an alternative to surfactants, before applying a SiO2 coating via the surfactant-free Stöber method. This study evaluated effect of number layers iron powders different properties compared with non-coated powders. Electrochemical, microscopic, spectroscopic,...
The series of advanced nanocomposites consisting Gd
Unique magnetic properties of superparamagnetic iron oxide (hematite) nanoparticles prepared by nanocasting in a periodic nanoporous silica (PNS) matrix are described this work. The were via novel approach, when the external surface PNS was modified to become more hydrophobic. composite sample characterized synchrotron related techniques small-angle X-ray scattering (SAXS), wide-angle (WAXS), and absorption near edge spectra (XANES) measurements, nitrogen adsorption/desorption, high...
The magnetic properties of the nanocomposite consisting hematite (α-Fe2O3) nanoparticles embedded in hollows periodic nanoporous silica matrix were investigated. measurements showed on superparamagnetic behavior nanoparticles. This was evidenced by irreversibility magnetization curves measured zero-field-cooled and field cooled regimes, presence a maximum curve related to blocking temperature TB∼37 K also revealing coercivity HC below TB. value moment mP∼300 μB each iron-oxide particle...
In this work we describe the relationship between surface modification of hexagonally ordered mesoporous silica SBA-15 and loading/release characteristics nonsteroidal anti-inflammatory drug (NSAID) naproxen. Mesoporous (MPS) was modified with 3-aminopropyl, phenyl cyclohexyl groups by grafting method. Naproxen adsorbed into pores prepared MPS from ethanol solution using a solvent evaporation The release performed in buffer medium at pH 2 physiological 7.4. Parent MPSs as well naproxen...
Using microemulsion methods, CoO-Pt core-shell nanoparticles, with diameters of nominally 4 nm, were synthesized and characterized by high-resolution transmission electron microscopy a suite x-ray spectroscopies, including diffraction, absorption, absorption near-edge structure, extended fine which confirmed the existence CoO cores pure Pt surface layers. commercial magnetometer, ac dc magnetic properties investigated over range temperature (2 K $\ensuremath{\le}T\ensuremath{\le}$ 300 K),...
Abstract Structural characteristics of nanocomposite series consisting iron oxide nanoparticles (NPs) embedded in the regular pores amorphous silica matrix (SBA-15) were investigated by means small angle neutron scattering (SANS). By virtue unique properties, insight into inner structure and matter organization this kind systems was facilitated for first time. Based on rigorous experimental support, fundamental model describing intensity distribution proposed assuming general composite...
The thermal decomposition of μ3-oxo trinuclear iron(<sc>iii</sc>) acetate in presence dodecylamine and oleic acid, trichloroacetic acid at 320 °C was optimized to obtain iron oxide nanoparticles with pure nanowire morphology.