A5078578052- Magnetism in coordination complexes
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Nanomaterials for catalytic reactions
- Lanthanide and Transition Metal Complexes
- Iron oxide chemistry and applications
- Electron Spin Resonance Studies
- Magnetic Properties and Synthesis of Ferrites
- Environmental remediation with nanomaterials
- Advanced biosensing and bioanalysis techniques
- Electrochemical sensors and biosensors
- Heusler alloys: electronic and magnetic properties
- Metal complexes synthesis and properties
- Graphene and Nanomaterials Applications
- Crystallography and molecular interactions
- Supercapacitor Materials and Fabrication
- Graphene research and applications
- Magnetic Properties of Alloys
- Electrochemical Analysis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Asymmetric Hydrogenation and Catalysis
- Magnetic properties of thin films
- Adsorption and biosorption for pollutant removal
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
Palacký University Olomouc
2016-2025
Regional Centre of Advanced Technologies and Materials
2016-2025
VSB - Technical University of Ostrava
2024
Advanced Technology Group (Czechia)
2021
Moravská Vysoká Skola Olomouc
2015-2020
All-Russian Electrotechnical Institute named after V.I.Lenin
1975
Abstract The hydrogenation of nitriles to amines represents an important and frequently used industrial process due the broad applicability resulting products in chemistry life sciences. Despite existing portfolio catalysts reported for nitriles, development iron-based heterogeneous this is still a challenge. Here, we show that impregnation pyrolysis iron(II) acetate on commercial silica produces reusable Fe/Fe–O@SiO 2 catalyst with well-defined structure comprising fayalite phase at Si–Fe...
Zero-valent iron nanoparticles (nZVI) treated by reduced sulfur compounds (i.e., sulfidated nZVI, S-nZVI) have attracted increased attention as promising materials for environmental remediation. While the preparation of S-nZVI and its reactions with various groundwater contaminants such trichloroethylene (TCE) were already a subject several studies, nanoparticle synthesis procedures investigated so far suited mainly laboratory-scale only limited possibility easy cost-effective large-scale...
Nitriding has been used for decades to improve the corrosion resistance of iron and steel materials. Moreover, nitrides (FexN) have shown give an outstanding catalytic performance in a wide range applications. We demonstrate that nitriding also substantially enhances reactivity zerovalent nanoparticles (nZVI) groundwater remediation, alongside reducing particle corrosion. Two different types FexN were synthesized by passing gaseous NH3/N2 mixtures over pristine nZVI at elevated temperatures....
Citrinin is a nephrotoxic mycotoxin which can be synthesized by Monascus mold during the fermentation process in foods. Monascus, generally described as red mold, red-pigmented filamentous fungus attracting great interest for production of natural dyes and cholesterol-lowering statins. We individuated specie producing high amount dyes. However, this pigmentation was correlated with citrinin. Peculiar magnetic nanoparticles, in-house called "Surface Active Maghemite Nanoparticles" (SAMNs),...
Earth abundant metal-based heterogeneous catalysts with highly active and at the same time stable isolated metal sites constitute a key factor for advancement of sustainable cost-effective chemical synthesis. In particular, development more practical, durable iron-based materials is central interest organic synthesis, especially preparation products related to life science applications. Here, we report Fe-single atom (Fe-SACs) entrapped in N-doped mesoporous carbon support unprecedented...
Two new two-stage manipulation protocols, namely light- and temperature-assisted spin state annealing (LASSA/TASSA), are applied to a crossover coordination polymer, [Fe(isoq)<sub>2</sub>{Au(CN)<sub>2</sub>}<sub>2</sub>], revealing the hidden multistability of states.
Curcumin possesses wide-ranging anti-inflammatory and anti-cancer properties its biological activity can be linked to potent antioxidant capacity. Superparamagnetic maghemite (γ-Fe2 O3 ), called surface-active nanoparticles (SAMNs) were surface-modified with curcumin molecules, due the presence of under-coordinated Fe(III) atoms on nanoparticle surface. The so-obtained curcumin-modified SAMNs (SAMN@curcumin) had a mean size 13±4 nm. SAMN@curcumin was characterized by transmission scanning...
Nickel ferrite NiFe2O4 is a typical soft magnetic with high electrical resistivity used as frequency material. Neodymium (Nd3+) doped materials were fabricated using solid state reaction. The properties of the obtained material investigated by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), measurements on SQUID and Mössbauer spectroscopy. It was found that consists two different phases: Nd3+ NdFeO3. ions occupy cation sites...
The 1:1:1 reaction of DyCl3·6H2O, K3[Co(CN)6] and bpyO2 in H2O has provided access to a complex with formula [DyCo(CN)6(bpyO2)2(H2O)3]·4H2O (1) very good yield, while [DyFe(CN)6(bpyO2)2 (H2O)3]·4H2O (2) was also precipitated (also high yield) using K3[Fe(CN)6] instead K3[Co(CN)6]. Their structures have been determined by single-crystal X-ray crystallography characterized based on elemental analyses IR spectra. Combined direct current (dc) alternating (ac) magnetic susceptibility revealed...
Experimental protocols based on Electron Paramagnetic Resonance (EPR) and Raman spectroscopy are presented for the investigation of Fe(II) spin transition in Cu(II)-doped 1-D spin-crossover (SCO) nanoparticles type [Fe1−xCux(NH2trz)3]Br2 where x = 0.03 0.06 NH2trz 4-amino-1, 2, 4-triazole. The resulting were characterized using Transmission Microscopy (TEM), Infrared (IR) spectroscopy, powder X-ray diffraction (p-XRD). Magnetic susceptibility measurements revealed a dependence scan rate,...
Abstract Dichromate binds to surface‐active maghemite nanoparticles (SAMNs) form a stable core–shell nanostructures (SAMN@Cr VI ). The hybrid was characterized by Mössbauer spectroscopy, high‐angle annular dark‐field imaging, electron energy‐loss and electrochemical techniques, which revealed strong interaction of dichromate with the nanoparticle surface. Electrochemical characterization showed lower charge‐transfer resistance, better performance, more reversible behavior respect naked...
The study presents a systematic kinetics investigation of the decay ferrate(<sc>vi</sc>) in presence inorganic buffering ions (borate, phosphate, and carbonate) at pH range from 6.0 to 9.0.
Abstract Supercapacitors are a promising energy storage technology owing to their unparalleled power and lifetime. However, meet the continuously rising demands of storage, they must be equipped with higher densities. For this purpose, seamless integration metal oxides on carbon matrices, such as iron oxides/oxyhydroxides, has been pursued through hydrothermal, atomic layer electro‐deposition methods directly current collectors. Nevertheless, present limited compatibility commercial...
Magnetic iron oxide nanocrystals (MIONs) are established as potent theranostic nanoplatforms due to their biocompatibility and the multifunctionality of spin-active atomic framework. Recent insights have also unveiled attractive near-infrared photothermal properties, which are, however, limited by low absorbance, resulting in noncompetitive conversion efficiencies (PCEs). Herein, we report on dramatically improved condensed clustered MIONs, reaching an ultrahigh PCE 71% at 808 nm, surpassing...
The emerging class of 2D non-van der Waals (n-vdW) materials, including iron oxides, possesses unique properties and high applicability, making them attractive for various technological applications. However, the synthesis these materials through a scalable eco-friendly method remains challenge, as most known chemical exfoliation processes require toxic organic solvents. In this study, we report green hematene (α-Fe2O3) using an ultrasound-supported earth-abundant oxide ore in pure aqueous...
A novel, simple, high-yield synthesis of Hägg carbide nanoparticles is presented. The developed χ-Fe<sub>5</sub>C<sub>2</sub>-based platform shows improved sensitivity towards the determination metronidazole.
In this study, we report on structural, magnetic, and electric features of β-Fe<sub>2</sub>O<sub>3</sub>identifying its magnetic ground state potentiality in photoelectrochemical applications.
Large amounts of biochar are produced worldwide for potential agricultural applications. However, this material can also be used as an efficient biosorbent xenobiotics removal. In work, was magnetically modified using microwave-synthesized magnetic iron oxide particles. This new type a responsive biocomposite easily separated by means strong permanent magnets. Magnetic has been inexpensive adsorbent the removal water-soluble dyes. Five dyes (malachite green, methyl Bismarck brown Y, acridine...
Abstract The present study is aimed at the exploration of achievable improvements for Cr VI ex situ and in water remediation by using novel naked colloidal maghemite (γ‐Fe 2 O 3 ) nanoparticles (surface active nanoparticles, SAMNs). reliability SAMNs binding removal was demonstrated, SAMN@Cr complex characterized, as well covalent nature absorption unequivocally proved. were structurally magnetically conserved after binding. Thus, consideration their affinity , exploited a biological model...
The diamagnetic two-dimensional Hofmann-type metal–organic framework [ZnII(2-mpz)2Ni(CN)4] has been successfully synthesized along with its isostructural hysteretic spin-crossover FeII analogue in the form of both bulk microcrystalline powder and nanoparticles. Detailed atomic force microscopy topographic study revealed a nanogrowth relationship between height length nanoparticle.
Abstract Terrestrial volcanism has been one of the dominant geological forces shaping our planet since its earliest existence. Its associated phenomena, like atmospheric lightning and hydrothermal activity, provide a rich energy reservoir for chemical syntheses. Based on laboratory simulations, we propose that early Earth volcanic activity inevitably led to remarkable production formic acid through various independent reaction channels. Large‐scale availability supports idea high‐temperature...