A5056826102- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Magnetic Properties and Applications
- Nanoparticle-Based Drug Delivery
- Characterization and Applications of Magnetic Nanoparticles
- Multiferroics and related materials
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Nanoparticles: synthesis and applications
- Carbon Nanotubes in Composites
- Physics of Superconductivity and Magnetism
- Fullerene Chemistry and Applications
- Graphene and Nanomaterials Applications
- Quantum Dots Synthesis And Properties
- High-pressure geophysics and materials
- Graphene research and applications
- Microfluidic and Bio-sensing Technologies
- Metallic Glasses and Amorphous Alloys
- Electronic and Structural Properties of Oxides
- Magnetic and Electromagnetic Effects
- Diamond and Carbon-based Materials Research
- Geomagnetism and Paleomagnetism Studies
Universidad de Zaragoza
2014-2025
Instituto de Nanociencia y Materiales de Aragón
2013-2025
Monash University
2024
Consejo Superior de Investigaciones Científicas
2003-2023
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
2018
Centro de Investigaciones Biológicas Margarita Salas
2007
AGH University of Krakow
2007
VSL Dutch Metrology Institute
1992
University of Amsterdam
1992
Unidades Centrales Científico-Técnicas
1989
Abstract Background In recent years, the application of nanotechnology in several fields bioscience and biomedicine has been studied. The use nanoparticles for targeted delivery substances given special attention is particular interest treatment plant diseases. this work both penetration movement iron-carbon cells have analyzed living plants Cucurbita pepo . Results were applied planta using two different methods, injection spraying, magnets used to retain particles specific areas plant....
† Background and Aims The great potential of using nanodevices as delivery systems to specific targets in living organisms was first explored for medical uses.In plants, the same principles can be applied a broad range uses, particular tackle infections.Nanoparticles tagged agrochemicals or other substances could reduce damage plant tissues amount chemicals released into environment.To explore benefits applying nanotechnology agriculture, stage is work out correct penetration transport...
A systematic study of the effect oxygen content on structural, magnetotransport, and magnetic properties has been undertaken a series ${\mathrm{LaMnO}}_{3+\mathrm{\ensuremath{\delta}}}$ samples, with $\ensuremath{\delta}=0,$ 0.025, 0.07, 0.1, 0.15. Measurements ac initial susceptibility, magnetization, magnetoresistance, neutron diffraction, including small-angle scattering (SANS), were performed in temperature range 1--320 K using high fields up to 12 T. The antiferromagnetic order found...
ac initial magnetic susceptibility, thermal expansion, and magnetostriction measurements were performed on a polycrystal of ${\mathrm{La}}_{0.60}{\mathrm{Y}}_{0.07}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ manganese oxide. We observed spontaneous volume contribution ( $\ensuremath{\cong}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ at ${T}_{C}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}160\ifmmode\pm\else\textpm\fi{}5\mathrm{K}$). This extra sharply decreases ${T}_{C}$ as...
The effects of magnetic field and pressure on the unusual spontaneous behavior ${\mathrm{La}}_{2/3}$${\mathrm{Ca}}_{1/3}$${\mathrm{MnO}}_{3}$ have been thoroughly investigated. Resistivity volume thermal expansion, both under pressure, ac susceptibility magnetostriction, magnetoresistance, neutron diffraction measurements, allowed us to determine relevant underlying mechanisms in this system. Above ${\mathit{T}}_{\mathit{c}}$ measurements reveal short-range ferromagnetic correlations...
A thorough study of the low-temperature magnetic state polycrystalline $({\mathrm{Tb}}_{1/3}{\mathrm{La}}_{2/3}{)}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ has been carried out. This perovskitelike compound is an insulator at low temperatures and shows insulator-metal transition under field. All measurements its (magnetization, susceptibility, neutron diffraction) are consistent with spin-glass behavior. The electronic phase diagram for series...
The effect of the substitution for Mn with Al in magnetoresistive perovskite ${\mathrm{La}}_{2\mathrm{/}3}$${\mathrm{Ca}}_{1\mathrm{/}3}$${\mathrm{MnO}}_{3}$ has been studied by preparing series ${\mathrm{La}}_{2\mathrm{/}3}$${\mathrm{Ca}}_{1\mathrm{/}3}$${\mathrm{Mn}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Al}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ (x\ensuremath{\leqslant}0.2). A careful study magnetic, structural, and transport properties carried out means electrical resistance,...
Metallic iron nanoparticles were synthesized within micron-sized mesoporous molecular sieves (with 2.9-nm pores) and hollow silica microcapsules (pores of 2.7 15 nm) using several cycles wet impregnation under vacuum, followed by drying, oxidation, reduction steps. For iron-loaded MCM-48, SQUID measurements revealed ferromagnetic behavior at room temperature with a magnetic moment as high 3.40 emu/g (measured 2 T) after four deposition cycles. Iron-loaded (250-nm wall thickness) showed 2.40...
The development of nanodevices for agriculture and plant research will allow several new applications, ranging from treatments with agrochemicals to delivery nucleic acids genetic transformation. But a long way is still in front us until such could be widely used. Their behaviour inside the plants not yet well known putative toxic effects both, directly exposed and/or animals humans, if reach food chain, remain uncertain. In this work we show that magnetic carbon-coated nanoparticles forming...
Abstract The Linear Response Theory (LRT) is a widely accepted framework to analyze the power absorption of magnetic nanoparticles for fluid hyperthermia. Its validity restricted low applied fields and/or highly anisotropic nanoparticles. Here, we present systematic experimental analysis and numerical calculations specific cobalt ferrite (CoFe 2 O 4 ) with different average sizes in viscous media. predominance Brownian relaxation as origin losses these particles established, changes Specific...
We have studied the magnetic and power absorption properties of a series nanoparticles (MNPs) Fe 3 O 4 with average sizes <d> ranging from to 26 nm.Heating experiments as function particle size revealed strong increase in specific (SPA) values for particles = 25-30 nm.On other side saturation magnetization M S these MNPs remain essentially constant above 10 nm, suggesting that mechanism is not determined by .The largest SPA value obtained was 130 W/g, corresponding bimodal distribution 17 nm.
For several years now, nanoscaled materials have been implemented in biotechnological applications related to animal (in particular human) cells and pathologies. However, the use of nanomaterials plant biology is far less widespread, although their application this field could lead future development biotechnology applications. any practical use, it crucial elucidate relationship between target cells. In work we evaluated behavior two types nanomaterials, quantum dots superparamagnetic...
A thorough study of the series has been carried out. All samples have same orthorhombic crystallographic structure. However, magnetic, magnetoelastic and electrical properties show drastic changes with Tb content. The decrease in intensity ferromagnetic double-exchange interaction correlated increase content Mn - O bond angle, which leads to a electron transfer between 3d 2p orbitals. Two magnetic phases detected at low temperatures: an insulator spin-glass phase high contents metallic contents.
The magnetoresistance of the FeRh alloy has been measured in temperature range 200–300 K using high pulsed magnetic fields up to 36 T. This compound shows a first-order transition from antiferromagnetic (AF) low-temperature state ferromagnetic (F) high-temperature at TAF–F=405 K. F is very close energy AF and can be reached by applying field. measurements made within show that AF–F accompanied giant effect (ΔR/R≊50%).
The compounds $R{\mathrm{Ni}}_{2}\mathrm{Mn}$ $(R=\mathrm{Tb},\phantom{\rule{0.3em}{0ex}}\mathrm{Dy},\phantom{\rule{0.3em}{0ex}}\mathrm{Ho},\phantom{\rule{0.3em}{0ex}}\mathrm{and}\phantom{\rule{0.3em}{0ex}}\mathrm{Er})$ with a ${\mathrm{MgCu}}_{2}$-type structure have been synthesized. $R$ to transition metal atom ratio is confirmed be 1:3 using the energy dispersive spectroscopy. structural and magnetic properties investigated by various experimental methods. x-ray diffraction patterns...
In this work, the capability of primary, monocyte-derived dendritic cells (DCs) to uptake iron oxide magnetic nanoparticles (MNPs) is assessed and a strategy induce selective cell death in these MNP-loaded DCs using external alternating fields (AMFs) reported. No significant decrease viability DCs, compared control samples, was observed after five days culture. The amount MNPs incorporated into cytoplasm measured by magnetometry, which confirmed that 1 5 pg particles were uploaded per cell....
PEGylated magneto-plasmonic nanoparticles with a hollow or semi-hollow interior have been successfully synthesized and their physico-chemical characteristics investigated. The space can be used to store drugs other molecules of interest whereas magnetic characterization shows potential as contrast agents in resonance imaging (MRI) applications. In addition, plasmonic the near infrared (NIR) region make them efficient photothermal applications producing high temperature gradients after short...
We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 nanoparticles with sizes between 5 25 nm, prepared by thermal decomposition Fe(acac)3 Co(acac)2. The large magneto-crystalline anisotropy synthesized particles resulted in high blocking temperatures (42 K &lt; TB 345 for d 13 nm) coercive fields (HC ≈ 1600 kA/m T = K). smallest (⟨d⟩=5 revealed existence magnetically hard, spin-disordered surface. dependence static dynamic whole series samples could be...
Magnetostriction parallel and perpendicular to the applied magnetic field has been measured for ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(x=0.3, 0.5)$ over a wide temperature range $(4.2<~T<~300$ K) up maximum of 14.2 T. We find huge anisotropic magnetostriction $({\ensuremath{\lambda}}_{t})$ with values as large $2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ $x=0.3$ $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ $x=0.5$ at T...
In order to investigate the paramagnetic ground state of colossal magnetoresistance (CMR) ${\mathrm{Sm}}_{0.55}{\mathrm{Sr}}_{0.45}{\mathrm{MnO}}_{3}$ compound we have used a wide set techniques: magnetoresistance, magnetization, high-resolution neutron diffraction, small-angle and muon spin relaxation. According these measurements would consist \ensuremath{\sim}0.8 nm ferromagnetic clusters embedded in short-range charge/orbital ordered matrix. The CMR effect occurs due percolation clusters.