PROPERTIES OF NANOCRYSTALLINE FE-NI PARTICLES PREPARED BY THERMAL REDUCTION OF OXALATE PRECURSORS
Švábenská, Eva; Roupcová, Pavla; Havlíček, Lubomír; Schneeweiss, Oldřich
2024 - anglický Recent technological advancements require development of cost-effective and high-performance magnets \nwhich ideally do not contain rare earth metals or noble metals. The promising candidates are Fe-Ni-based \nalloys, in particular, the Fe50Ni50 L10 phase (tetrataenite), which has a great perspective for producing hard \nmagnetic materials. Our study explores a promising method for preparing nanoparticles of Fe-Ni alloy from an \niron-nickel oxalate precursor. The coprecipitation method was employed to prepare oxalate precursors, \nfollowed by controlled thermal decomposition in a reducing hydrogen atmosphere. The morphology and \nproperties of the resulting particles were analysed using scanning electron microscopy (SEM) coupled with \nenergy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and \nmagnetic measurements.\nThe SEM analysis revealed that the particles have approximately cube-shaped unit cell morphology with a\nsize in a range of 1 - 2 μm. Upon annealing, the samples contain multiple phases with varying Fe-Ni content.\nMagnetic measurements confirmed the formation of magnetically suitable Fe-Ni phases in the samples after \nannealing. Mössbauer spectroscopy emerged as a highly effective method for characterizing individual phases \nof the Fe-Ni system. Klíčová slova: Magnetic materials; thermal decomposition; Mössbauer spectroscopy Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. PROPERTIES OF NANOCRYSTALLINE FE-NI PARTICLES PREPARED BY THERMAL REDUCTION OF OXALATE PRECURSORS

Recent technological advancements require development of cost-effective and high-performance magnets \nwhich ideally do not contain rare earth metals or noble metals. The promising candidates are ...

Švábenská, Eva; Roupcová, Pavla; Havlíček, Lubomír; Schneeweiss, Oldřich
Ústav fyziky materiálů, 2024

Electrochemistry of Acetaminophen
Mikysek, T.; Ludvík, Jiří
2024 - anglický The contribution is focused on electrochemical oxidation of acetaminophen mainly in non-aqueous media. The influence of various organic solvents as well as the pH effect is described herein. The redox properties of acetaminophen were studied by means of cyclic voltammetry, and rotating-disk voltammetry. We found that the protonation/deprotonation of acetaminophen acts as a ratedetermining step, where the stability of phenoxy radical intermediate plays an important role. Klíčová slova: acetaminophen; phenacetine; voltammetry Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Electrochemistry of Acetaminophen

The contribution is focused on electrochemical oxidation of acetaminophen mainly in non-aqueous media. The influence of various organic solvents as well as the pH effect is described herein. The redox ...

Mikysek, T.; Ludvík, Jiří
Ústav fyzikální chemie J. Heyrovského, 2024

A New Approach to Determining the Drug Guaifenesin Using Voltammetric and Flow Injection Analysis
Kelíšková, P.; Matvieiev, O.; Sokolová, Romana; Janíková, L.; Behúl, M.; Šelešovská, R.
2024 - anglický This study presents a new method for detecting guaifenesin (GFE) in pharmaceutical samples. We employed screen-printed sensors with a boron-doped diamond electrode (BDDE) to develop and validate both voltammetric and flow amperometric methods. These approaches were effectively used to analyze model solutions, pharmaceutical preparations, and serum samples spiked with GFE, producing accurate results comparable to those obtained with HPLC/DAD analysis. The developed methods provide straightforward, sensitive, and selective means for determining GFE in various sample matrices, underscoring the potential of SP/BDDE in electrochemical analysis. Klíčová slova: guaifenesin; screen-printed sensor; boron-doped diamond electrode Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. A New Approach to Determining the Drug Guaifenesin Using Voltammetric and Flow Injection Analysis

This study presents a new method for detecting guaifenesin (GFE) in pharmaceutical samples. We employed screen-printed sensors with a boron-doped diamond electrode (BDDE) to develop and validate both ...

Kelíšková, P.; Matvieiev, O.; Sokolová, Romana; Janíková, L.; Behúl, M.; Šelešovská, R.
Ústav fyzikální chemie J. Heyrovského, 2024

Optimization of Parameters Used in the Application of Elimination Voltammetry with Linear Scan
Navrátil, Tomáš; Trnková, L.; Hrdlička, Vojtěch; Li, X.
2024 - anglický Elimination Voltammetry with Linear Scan (EVLS) is a well-established mathematical method that aids in understanding an analyzed electrochemical system. In almost 30 years since its derivation, it has become a “black-box” technique that is applied automatically (in most cases due to its incorporation into a voltammetric software) without thinking about its fundamentals. However, the choice of optimum parameters under which DC voltammetric data (from which elimination curves are calculated) is crucial. This contribution deals with revealing the optimum ratio of applied scan rates and their absolute values (i.e., times of recording) in dependence on the character of the investigated system (diffusion-controlled process, adsorption-controlled process, etc.). Klíčová slova: elimination voltammetry with linear scan; optimization; adsorption Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Optimization of Parameters Used in the Application of Elimination Voltammetry with Linear Scan

Elimination Voltammetry with Linear Scan (EVLS) is a well-established mathematical method that aids in understanding an analyzed electrochemical system. In almost 30 years since its derivation, it has ...

Navrátil, Tomáš; Trnková, L.; Hrdlička, Vojtěch; Li, X.
Ústav fyzikální chemie J. Heyrovského, 2024

Manipulation automaton in primary education
2024 - Klíčová slova: automatizace; PLC; modul; výroba; programování Plné texty jsou dostupné v knihovně ZČU. Manipulation automaton in primary education

Západočeská univerzita v Plzni, 2024

Manufacturing and using wool
2024 - Klíčová slova: vlna; použití vlny; výroba vlny; tkaní; nalbinding; nopování; mykání; předení; tkaný pás Plné texty jsou dostupné v knihovně ZČU. Manufacturing and using wool

Západočeská univerzita v Plzni, 2024

Plastic materials in the context of reuse in teaching in the 5th grade
2024 - Klíčová slova: plasty; recyklace; legislativa; opětovné využití; životní prostředí; vzdělávání; pracovní činnosti; bezpečnost práce Plné texty jsou dostupné v knihovně ZČU. Plastic materials in the context of reuse in teaching in the 5th grade

Západočeská univerzita v Plzni, 2024

The relationship of digital literacy with e-health
2024 - Klíčová slova: e-health; digitální gramotnost; celoživotní učení; zmocnění pacienta Plné texty jsou dostupné v knihovně ZČU. The relationship of digital literacy with e-health

Západočeská univerzita v Plzni, 2024

Online training course within the framework of ths project D-challenge
2024 - Klíčová slova: evropský projekt; digitální dovednosti; online výuka Plné texty jsou dostupné v knihovně ZČU. Online training course within the framework of ths project D-challenge

Západočeská univerzita v Plzni, 2024

The using of the means of technology and information in teaching of subjects of primary school in Greece and in Czech republic
2024 - Klíčová slova: základní vzdělání; Informační a komunikační technologie; Řecko; Česká republika; metody výuky Plné texty jsou dostupné v knihovně ZČU. The using of the means of technology and information in teaching of subjects of primary school in Greece and in Czech republic

Západočeská univerzita v Plzni, 2024