A5043583720- Aluminum Alloys Composites Properties
- Microstructure and mechanical properties
- Aluminum Alloy Microstructure Properties
- Metallurgy and Material Forming
- nanoparticles nucleation surface interactions
- Intermetallics and Advanced Alloy Properties
- Metal Forming Simulation Techniques
- Metal and Thin Film Mechanics
- Muon and positron interactions and applications
- Advanced materials and composites
- Nuclear Materials and Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Magnesium Alloys: Properties and Applications
- Copper Interconnects and Reliability
- Quantum Dots Synthesis And Properties
- Catalytic Processes in Materials Science
- Conducting polymers and applications
- Astrophysics and Cosmic Phenomena
- Rare-earth and actinide compounds
- Metallic Glasses and Amorphous Alloys
- Particle Detector Development and Performance
- Ammonia Synthesis and Nitrogen Reduction
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Nanoparticles: synthesis and applications
Charles University
2016-2025
University of Mons
2023
Interface (United Kingdom)
2020
University of Warsaw
2011-2013
Comtes Fht (Czechia)
2009
Czech Academy of Sciences, Institute of Physics
2008
École Polytechnique Fédérale de Lausanne
1994-2004
Abstract The courses of aniline oxidation with ammonium peroxydisulfate in aqueous solutions strong (sulfuric) and weak (acetic) acids, followed by temperature acidity changes, are different. In sulfuric acid, granular polyaniline (PANI) was produced; acetic PANI nanotubes were obtained. external diameter the 100–300 nm, internal cavity 20–100 length extended to several micrometres. morphology PANI, or tubular, depends on conditions during reaction rather than chemical nature acid. also...
Thermal stability of ultrafine grained (mean grain size 150 nm) copper prepared by high pressure torsion was studied means positron-lifetime spectroscopy correlated with transmission electron microscopy. The microstructure the material is strongly inhomogeneous. interiors low dislocation density are separated distorted regions number dislocations. We have found that positrons trapped at dislocations inside and in microvoids situated grains. Calculations lifetime a positron microvoid as...
Polypyrrole nanotubes were prepared by the oxidation of pyrrole with iron(III) chloride in presence methyl orange. They subsequently used for reduction silver ions to nanoparticles. The nanotubular form polypyrrole is compared classical globular morphology its ability reduce ions. Both salts and bases experiments. content metallic resulting composite, determined thermogravimetric analysis, was 21–31 wt%. Elemental composition also discussed on basis energy-dispersive X-ray spectroscopy....
Laser Shock Peening with (LSP) and without protective coating (LPwC) was applied to sensitized AA5083 followed by electrochemical analysis. Potentiodynamic tests indicated a region of increased passivity for the LPwC samples lower corrosion current. Similarly, significantly reduced intergranular rate observed during potentiostatic polarization after treatment while LSP showed only negligible improvement. The results are attributed unique recast surface layer composed modified oxide film an...
Abstract High‐temperature plasmonics deals with optically active nanostructures that can withstand high temperatures. A conventional approach relying on standalone noble metal nanoparticles fails to deliver refractory plasmonic nanomaterials, and an alternative route envisions nitrides. The main challenge remains the development of advanced synthesis techniques insight into thermal stability under real‐life application conditions. Here, hafnium nitride (HfN NPs) be produced by gas...
Our aim in the present work was to investigate changes of defect structure bulk niobium induced by hydrogen loading. The evolution microstructure with increasing concentration studied x-ray diffraction and two complementary techniques positron annihilation spectroscopy (PAS), namely lifetime slow implantation measurement Doppler broadening, defect-free Nb $(99.9%)$ containing a remarkable number dislocations. These samples were electrochemically loaded up...
Precipitation stages in the hot-deformed Al-5.28wt.%Zn-3.21wt.%Mg-1.48wt.%Cu-0.24wt.%Si-0.24wt.%Mn-0.14wt.%Fe(−0.23wt.%Sc-0.19wt.%Zr) alloys were investigated. Positron annihilation spectroscopy was employed for a study of vacancy assisted clustering solutes on atomic scale, type and concentration open volume misfit defects local chemical surroundings defects. Microhardness testing, thermal analysis microstructure observations also used. The contain eutectic grain boundary phases: T-phase...
The properties of MXenes, new generation 2D materials, are determined by the surface terminations, which depends on flake preparation method. Changing termination chemical groups can significantly modify MXene and functionality. However, common methods chemistry tuning require high-energy treatments often lead to damage. In this work, we propose a plasmon-assisted transformation for flakes. plasmon resonance was directly excited flakes induced highly reactive radicals from electrostatically...
To improve the actual environmental situation, in closing loop of carbon dioxide (CO2) cycle by reutilization, CO2 activation is necessary. The energy inputs for that should be economically viable and renewable, while catalyst(s) come from naturally abundant elements building blocks. Important also technological simplicity friendliness used chemicals. In this work, we propose a promising solution reutilization based on plasmon-assisted photocatalysis using CuNPs MOF, L-glutamic acid Zn ions...
A processing scheme for preparing strips of Al−Cu−Li−Mg−Zr-based alloys microalloyed with Sc was proposed. This includes a twin-roll casting near-net-shaped 3 mm-thick gauge and homogenization/solution treatment step. Two cast were studied, one an addition 0.17 wt.% Sc, the other without Sc. Both annealed at 300 °C 30 min, 450 530 min quenched into room temperature water. The first two annealing steps provide fine dispersion Al3Zr/Al3(Sc,Zr) particles. final step serves as treatment....
Magnetron sputtering is a well-known technique that commonly used for the deposition of thin compact films. However, as was shown in 1990s, when performed at pressures high enough to trigger volume nucleation/condensation supersaturated vapor generated by magnetron, various kinds nanoparticles may also be produced. This finding gave rise rapid development magnetron-based gas aggregation sources. Such systems were successfully production single material from metals, metal oxides, and plasma...
Group IV transition metal (III) nitrides (MeN) are plasmonic materials that possess high optical absorption cross-sections and fast electron–phonon coupling make them attractive in solar energy harvesting. Nanoparticles (NPs) of MeN dispersed host liquids were predicted to be useful photothermal conversion, although such nanofluids have never been systematically studied, mainly because the complexity their preparation. This research introduces reactive magnetron sputtering Ti, Zr, Hf targets...
The sintering dynamics of nickel nanoparticles (Ni NPs) were investigated through a comprehensive approach that included in situ transmission electron microscopy annealing and molecular simulations. This study systematically examines the transformation behaviors Ni NP agglomerates over temperature spectrum from room to 850 °C. Experimental observations, supported by simulations, revealed essential influence rotational translational motions particles, especially at lower temperatures, on...
Abstract A chronic nonhealing wound poses a significant risk for infection and subsequent health complications, potentially endangering the patient‘s well-being. Therefore, effective dressings must meet several crucial criteria, including: (1) eliminating bacterial pathogen growth within wound, (2) forming barrier against airborne microbes, (3) promoting cell proliferation, (4) facilitating tissue repair. In this study, we synthesized 8 ± 3 nm Ag NP with maleic acid incorporated them into an...
The present work provides a review of the information available on Al-rich corner Al–Fe–Si system as well CALPHAD type assessment making use COST 507 database starting point. description intermetallic compounds has been modified to account for substitution Al and Si in ternary Al-Fe-Si take new experimental into account.
Ni@Ti core–shell nanoparticles were prepared by a vacuum based method using the gas aggregation source (GAS) of nanoparticles. Ni fabricated in GAS afterwards coated Ti shell. The shell was deposited means magnetron sputtering. decelerated vicinity to Ar drift velocity second deposition chamber. X-ray photoelectron spectroscopy and energy dispersive x-ray analysis showed structure. It shown that thickness can be easily tuned process parameters with maximum achieved ~2.5 nm. structure...