A5001252595- Particle accelerators and beam dynamics
- Metallic Glasses and Amorphous Alloys
- Superconducting Materials and Applications
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Microstructure and Mechanical Properties of Steels
- ZnO doping and properties
- Characterization and Applications of Magnetic Nanoparticles
- Rare-earth and actinide compounds
- Semiconductor materials and interfaces
- Iron oxide chemistry and applications
- Microstructure and mechanical properties
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Magnetic Properties and Synthesis of Ferrites
- Magnetic and transport properties of perovskites and related materials
- Ion-surface interactions and analysis
- Electronic and Structural Properties of Oxides
- Crystallography and Radiation Phenomena
- Theoretical and Computational Physics
- Nanoparticle-Based Drug Delivery
- Copper Interconnects and Reliability
Universidad Nacional de La Plata
2014-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2013-2024
Fusion for Energy
2008-2024
Instituto de Física La Plata
2009-2023
Thales (France)
2019
École Polytechnique Fédérale de Lausanne
2005-2018
Centre National de la Recherche Scientifique
2013-2015
Électricité de France (France)
2015
Université Grenoble Alpes
2013-2015
Karlsruhe Institute of Technology
2013
A numerically solved two-level Stoner-Wohlfarth model with thermal agitation is used to simulate Zero Field Cooling (ZFC)–Field (FC) curves of monosize and polysize samples determine the best method for obtaining a representative blocking temperature TB value samples. The results confirm technique based on T derivative difference between ZFC FC proposed by Micha et al. (the good) demonstrate its relation two alternative methods: maximum bad) inflection point ugly). then applied experimental...
In recent years there has been an intense search for room temperature ferromagnetism in doped dilute semiconductors, which have many potentially applications spintronics and optoelectronics. We report here the unexpected observation of significant a semiconductor with nonmagnetic impurities, Cu-doped TiO$_2$ thin films grown by Pulsed Laser Deposition. The magnetic moment, calculated from magnetization curves, resulted surprisingly large, about 1.5 $\mu_B$ per Cu atom. A large moment was...
Magnetite (Fe3O4) nanoparticles are proper materials for Magnetic Fluid Hyperthermia applications whenever these conjugate stability at physiological (neutral pH) medium and high specific dissipation power. Here, magnetite 9–12 nm in size, electrostatically stabilized by citric acid coating, with hydrodynamic sizes the range 17–30 nm, well dispersed aqueous solution were prepared using a chemical route. The influence of media acidity during adsorption (CA) on suspension's long-term was...
Biomedical magnetic colloids commonly used in hyperthermia experiments often display a bidisperse structure, i.e., are composed of stable nanoclusters coexisting with well-dispersed nanoparticles. However, the influence optimization for heat dissipation is usually excluded. In this work, to analyze effect nanoclustering and long-range dipolar interaction on efficiency. Two kinds colloids, magnetite cores mean sizes around 10 18 nm, coated oleic acid dispersed hexane,...
The ITER electron cyclotron (EC) upper port antenna (or launcher) is nearing completion of the detailed design stage and final build-to-print will soon start. main objective this launcher to drive current locally stabilize neoclassical tearing modes (NTMs) (depositing ECCD inside island that forms on either q = 3/2 or 2 rational magnetic flux surfaces) control sawtooth instability (deposit near 1 surface). should be capable steering focused beam deposition location resonant surface over...
With the goal of an efficient and selective surface hydrophobization for subsequent colloidal dispersion into non-polar media, cellulose nanocrystals (CNCs) were transformed aerogels high area, prepared by freeze-drying dilute CNC suspensions in mixtures water t-BuOH various compositions. In best case, namely with dispersions a medium consisting 20 parts 80 (w/w), freeze-dried having specific areas as 160 m2 g−1 widely open texture obtained. These then subjected to gas-phase esterification...
Adsorptive phenomena involving dispersed iron oxide superparamagnetic nanoparticles and asphaltenes in crude oil have been profiled as promising technological alternatives, particularly since these interactions can induce significant structural changes within the matrices, effectively inhibiting formation of complex long-range viscoelastic structures. Furthermore, effect adsorbed on magnetic dipolar among particles has proven, showing multiple asphaltene layers that stimulate a steric...
Cubic-like shaped Zn x Fe 3-x O 4 particles with crystallite mean sizes D between 15 and 117 nm were obtained by co-precipitation.Particle size effects preferential occupation of spinel tetrahedral site 2+ ions led to noticeable changes physical properties.D 30 displayed nearly bulk properties, which dominated concentration.For nm, dominant magnetic relaxation observed Mössbauer spectroscopy, the blocking B ∼ 13 nm.Saturation magnetization increased up 0.1-0.3 decreased for larger x.Power...
Aiming to analyze relevant aspects of interacting magnetic nanoparticle systems (frequently called superparamagnets), a model is built from dipolar interaction and demagnetizing mean-field concepts. By making reasonable simplifying approximations, simple useful expression for effective factors achieved, which allows the analysis uniform nonuniform spatial distributions nanoparticles, in particular occurrence clustering. This function associated with specimen shape clusters shape, mean...
Abstract With ITER's re-baseline, the Electron Cyclotron Heating system has become of even higher importance with multiple purposes plasma heating, current drive, and instability suppression. ITER’s is based on several gyrotrons, such as radio-frequency sources supposed to provide on-demand power in order megawatts millimeter-wave domain. Due non-linear dynamics involved gyrotron operation structure machine itself, controlling a preparing it shortest time possible radiofrequency represents...
We present a series of measurements fluctuating perturbation in the angular correlation $^{111}\mathrm{Cd}$ ${\mathrm{In}}_{2}$${\mathrm{O}}_{3}$ powder samples. analyze temperature dependence associated hyperfine parameters and conclude that this arises from "aftereffects" following electron capture $^{111}\mathrm{In}$. discuss connection perturbed-angular-correlation aftereffects with local electric properties at impurity sites semiconductors.
An essential understanding of the adsorptive phenomena involving nanomaterials and asphaltenes has received considerable attention in oil recovery production applications. Particularly, iron oxide-based nanoparticles have emerged as advanced materials due to their unique physicochemical properties, including thermal conductivity superparamagnetism. On this basis, kinetics adsorption isotherms magnetite (Fe3O4) nanoparticles/asphaltene systems were investigated, well synergistic effect resins...
We have applied the M\"ossbauer effect to study local atomic environments in metastable crystalline ${\mathrm{Fe}}_{100\mathrm{?}(\mathrm{hyx}}$${\mathrm{B}}_{\mathrm{x}}$ alloys (1\ensuremath{\le}x\ensuremath{\le}12) produced by rapid quenching from melt. For concentrations up 9 at. % B, spectra revealed existence of three distinct $^{57}\mathrm{Fe}$ sites, characterized room-temperature hyperfine fields 330, 267, and 236 kOe, first which is that Fe bcc \ensuremath{\alpha}-Fe. The other two...
Commercial LaAlO3 substrates were thermally cycled simulating a procedure similar to those followed during TiO2 and SnO2 dilute magnetic semiconductors’ film pulsed laser deposition. Ferromagneticlike behavior was found in some substrates, which metallic iron impurities detected by x-ray photoelectron spectroscopy total reflection fluorescence measurements. A thorough experimental investigation, using high resolution techniques, showed that these introduced the used fix oven silicon holders....
The generation of singlet oxygen (SO) in the presence specific photosensitizers (PSs) or semiconductor quantum dots (QDs) and its application photodynamic therapy (PDT) is great interest to develop cancer therapies with no need surgery, chemotherapy, and/or radiotherapy. This work was focused on identification main factors leading enhancement SO production using Rose Bengal (RB), Methylene Blue (MB) as PS species organic aqueous mediums. Subsequently, capacity zinc oxide (ZnO), sulfide...
The upgraded European 1-MW, 170-GHz continuous wave (CW) industrial prototype gyrotron (TH1509U) for electron cyclotron resonance heating and current drive in ITER was tested at the Karlsruhe Institute of Technology (KIT). In this work, we report on major achievements during experimental campaigns that took place intermittently between October 2020 July 2021. clearly surpassed performance previous TH1509 tube. particular, TH1509U delivered (i) 0.9 MW 180 s pulses (maximum possible pulse...
We present a series of measurements the static and time-dependent interactions in angular correlation $^{111}\mathrm{In}$ (electron capture to $^{111}\mathrm{Cd}$) pure Sn-doped ${\mathrm{In}}_{2}$${\mathrm{O}}_{3}$. Results on electric field gradient are consistent with mainly ionic bonds confirm s character conduction band. The temperature free-electron-density dependence fluctuating interaction is analyzed, thus allowing tentative description electron-capture aftereffects semiconductors...
Based on a knowledge of the NMR spectra for FeB, Fe2B, orthorhombic Fe3B (o-Fe3B), and body-centered-tetragonal (bct-Fe3B), phases produced during annealing Fe-B amorphous alloys can be identified with greater sensitivity by techniques than x-ray diffraction. In present work, combination diffraction experiments spin-echo measurements hyperfine field distributions 10B, 11B, 57 Fe nuclei has been performed both as-quenched annealed Fe100−xBx (14≤x≤25) alloys. general terms, it was found that...
The internal oxidation of $\mathrm{Ag}\mathrm{In}$ alloys has been investigated by time-differential perturbed angular correlation technique on $^{111}\mathrm{In}$ probes. We studied the kinetics dilute (a few ppm) at 300\ifmmode^\circ\else\textdegree\fi{}C under different annealing conditions and 1 at.% indium 550\ifmmode^\circ\else\textdegree\fi{}C. In some cases, time dependence oxidation-front advance was ruled a power law with an exponent from 0.5. determined hyperfine parameters...