scholarly journals Determination of the hyperfine magnetic field in magnetic carbon-based materials: DFT calculations and NMR experiments

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Jair C. C. Freitas ◽  
Wanderlã L. Scopel ◽  
Wendel S. Paz ◽  
Leandro V. Bernardes ◽  
Francisco E. Cunha-Filho ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Dft Calculations ◽  
Hyperfine Magnetic Field ◽  
Magnetic Carbon ◽  
Carbon Based

scholarly journals Separation of hyperfine interactions in Mössbauer spectrocsopy

2019 ◽  
Vol 241 (1) ◽  
Author(s):  
Krzysztof R. Szymański
Keyword(s):  
Magnetic Field ◽  
Electric Field Gradient ◽  
Isomer Shift ◽  
Hyperfine Interactions ◽  
Hyperfine Magnetic Field ◽  
Hyperfine Fields ◽  
Explicit Formulas ◽  
Unpolarized Radiation ◽  
Velocity Moments

AbstractProblem of determination of isomer shift, all components of the electric field gradient and hyperfine magnetic field in case of mixed hyperfine interactions is presented. Orientation of hyperfine fields in the absorber Cartesian frame can be determined by few measurements with use of unpolarized radiation under different directions of wave vector with respect to the absorber. The method can be applied for absorbers with well separated absorption lines in their spectra. Explicit formulas for tensor components of hyperfine interactions derived from velocity moments formalism are presented.

Mechanically Driven Dissolution of Sn in Near-Equiatomic Bcc FeCo

2012 ◽  
Vol 194 ◽  
pp. 187-193 ◽  
Author(s):  
J.M. Loureiro ◽  
Benilde F.O. Costa ◽  
Gerard Le Caër ◽  
Bernard Malaman
Keyword(s):  
Magnetic Field ◽  
Solid Solutions ◽  
Room Temperature ◽  
Hyperfine Magnetic Field ◽  
Ternary Alloys ◽  
119Sn Mössbauer Spectroscopy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Powder Mixtures ◽  
X Ray

Ternary alloys, (Fe50−x/2Co50−x/2)Snx(x ≤ 33 at.%), are prepared by mechanical alloying from powder mixtures of the three elements. As-milled alloys are studied by X-ray diffraction and 57Fe and 119Sn Mössbauer spectroscopy. The solubility of Sn in near-equiatomic bcc FeCo is increased from ~0.5 at. % at equilibrium to ~20 at.% in the used milling conditions. The average 119Sn hyperfine magnetic field at room temperature is larger, for any x, than the corresponding fields in mechanically alloyed Fe-Sn solid solutions.

scholarly journals Antioxidant Determination with the Use of Carbon-Based Electrodes

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 72
Author(s):  
Aurelia Magdalena Pisoschi ◽  
Aneta Pop ◽  
Florin Iordache ◽  
Loredana Stanca ◽  
Liviu Bilteanu ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxidation Process ◽  
Low Cost ◽  
Oxidative Enzymes ◽  
Adaptation Mechanisms ◽  
Chain Breaking ◽  
Nanomolar Range ◽  
Quench Singlet Oxygen ◽  
Carbon Based

Antioxidants are compounds that prevent or delay the oxidation process, acting at a much smaller concentration, in comparison to that of the preserved substrate. Primary antioxidants act as scavenging or chain breaking antioxidants, delaying initiation or interrupting propagation step. Secondary antioxidants quench singlet oxygen, decompose peroxides in non-radical species, chelate prooxidative metal ions, inhibit oxidative enzymes. Based on antioxidants’ reactivity, four lines of defense have been described: Preventative antioxidants, radical scavengers, repair antioxidants, and antioxidants relying on adaptation mechanisms. Carbon-based electrodes are largely employed in electroanalysis given their special features, that encompass large surface area, high electroconductivity, chemical stability, nanostructuring possibilities, facility of manufacturing at low cost, and easiness of surface modification. Largely employed methods encompass voltammetry, amperometry, biamperometry and potentiometry. Determination of key endogenous and exogenous individual antioxidants, as well as of antioxidant activity and its main contributors relied on unmodified or modified carbon electrodes, whose analytical parameters are detailed. Recent advances based on modifications with carbon-nanotubes or the use of hybrid nanocomposite materials are described. Large effective surface area, increased mass transport, electrocatalytical effects, improved sensitivity, and low detection limits in the nanomolar range were reported, with applications validated in complex media such as foodstuffs and biological samples.

Determination of reactive properties of 1-butyl-3-methylimidazolium taurate ionic liquid employing DFT calculations

2016 ◽  
Vol 222 ◽  
pp. 796-803 ◽  
Author(s):  
Stevan Armaković ◽  
Sanja J. Armaković ◽  
Milan Vraneš ◽  
Aleksandar Tot ◽  
Slobodan Gadžurić
Keyword(s):  
Ionic Liquid ◽  
Dft Calculations ◽  
Reactive Properties

Calculation and Verification of Magnetic Field Parameters in Axial Active Magnetic Bearing

2014 ◽  
Vol 214 ◽  
pp. 143-150
Author(s):  
Piotr Graca
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Magnetic Force ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Magnetic Flux Density ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Magnetic Field Computation

The paper presents numerical modeling of an Axial Active Magnetic Bearing (AAMB) based on two-dimensional (2D) magnetic field computation. The calculations, assisted by the Finite Element Method (FEM), have focused on the determination of the magnetic flux density and the magnetic force. Obtained magnetic field parameters were then measured and verified on a physical model.

scholarly journals The development of a magnetic iron/nitrogen-doped graphitized carbon composite with boosted microwave attenuation ability as the wideband microwave absorber

2021 ◽  
Author(s):  
Cong Chen ◽  
Wen Chen ◽  
Bing Zong ◽  
Xiaohai Ding ◽  
Haitao Dong
Keyword(s):  
Dielectric Loss ◽  
Carbon Composite ◽  
Microwave Absorber ◽  
Nitrogen Doped ◽  
Graphitized Carbon ◽  
Microwave Attenuation ◽  
Magnetic Carbon ◽  
Carbon Based

Magnetic carbon-based composites have been attractive candidates for electromagnetic (EM) absorption due to their dual magnetic and dielectric loss ability.

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