A5041445081- Multiferroics and related materials
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Ferroelectric and Piezoelectric Materials
- Gas Sensing Nanomaterials and Sensors
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Electromagnetic wave absorption materials
- ZnO doping and properties
- Graphene research and applications
- Electronic and Structural Properties of Oxides
- Advanced Antenna and Metasurface Technologies
- Corrosion Behavior and Inhibition
- Magnetic Properties of Alloys
- Transition Metal Oxide Nanomaterials
- Advancements in Battery Materials
- Quantum Dots Synthesis And Properties
- Magnesium Alloys: Properties and Applications
- Copper-based nanomaterials and applications
- Microwave Dielectric Ceramics Synthesis
- Semiconductor materials and devices
- 2D Materials and Applications
- Clay minerals and soil interactions
- Advanced Condensed Matter Physics
- Metallic Glasses and Amorphous Alloys
Instituto de Cerámica y Vidrio
2022-2025
Instituto de Ciencia de Materiales de Madrid
2020-2024
Universidad Complutense de Madrid
2005-2024
Consejo Superior de Investigaciones Científicas
2019-2024
University of Concepción
2024
Northwest Arkansas Community College
2024
European Science Foundation
2024
European Synchrotron Radiation Facility
2020-2023
In this work, we present a sol–gel synthesis of ε-Fe2O3 nano and microparticles stabilized in silica thin films. Thanks to the relatively high size synthesized particles, have been able discriminate Raman signal ε- α-Fe2O3 phases, thus presenting first Confocal Microscopy study isolated particles. The vibrational modes each phase are identified at room temperature. transition from morphological modifications analyzed as function situ output laser power. A complete spectra for particles has...
This work introduces a methodology for the design of X-band microwave absorbers using carbon-graphite powder composites. The reflection loss (RL) is adjusted through variations in sample thickness, mono/bi-slab geometries, and effective dielectric constant. impact particle size powders volume fraction (v.f.) composites on permittivity has been systematically investigated. Nicolson-Ross-Weir (NRW) conversion Birchak mixing model were employed. Optimal absorption conditions predicted by RL...
A plethora of technological applications justify why titanium dioxide is probably the most studied oxide, and an optimal exploitation its properties quite frequently requires a controlled modification surface. Low-energy ion bombardment one extended techniques for this purpose has been recently used in oxides, among other applications, to favour resistive switching mechanisms or form transparent conductive layers. Surfaces modified way are described as reduced defective, with high density...
We present a novel and easy synthetic path to prepare ε-Fe<sub>2</sub>O<sub>3</sub>(∼90%) with small portion of α-Fe<sub>2</sub>O<sub>3</sub>nanoparticles embedded in an amorphous silica matrix.
Abstract The identification of epsilon iron oxide (ɛ‐Fe 2 O 3 ) as the low Curie temperature high coercivity stable phase (HCSLT) carrying remanence in heated archeological samples has been achieved from two sites that exhibited clearest evidence presence HCSLT. This uncommon detected by Confocal Raman Spectroscopy (CRS) and characterized rock magnetic measurements. Large numbers ɛ‐Fe microaggregates (in CO) or isolated clusters HEL) could be recognized, distributed over whole sample,...
Nitrogen dioxide (NO2) is a potential hazard to human health at low concentrations, below one part per million (ppm). NO2 can be monitored using gas sensors based on multi-layered graphene operating ambient temperature. However, reliable detection of concentrations the order parts and lower hindered by partial recovery lack reproducibility after exposure. We show how overcome these longstanding problems ultraviolet (UV) light. When exposed NO2, sensor response enhanced 290 % − 550 under 275...
Defective few-layered graphene mesostructures (DFLGMs) are produced from graphite flakes by high-energy milling processes. We obtain an accurate control of the generated mesostructures, as well amount and classification structural defects formed, providing a functional material for microwave absorption purposes. Working under far-field conditions, competitive values minimum reflection loss coefficient (RLmin) = -21.76 dB EAB 4.77 achieved when DFLGMs immersed in paints at low volume fraction...
The incessant technological pursuit towards a more sustainable and green future depends strongly on permanent magnets. At present, their use is widespread, making it imperative to develop new processing methods that generate highly competitive magnetic properties reducing the fabrication temperatures costs. Herein, novel strategy for developing dense sintered magnets based Sr-hexaferrites with upper functional characteristics presented. An innovative cold sintering approach using glacial...
In this study, layer-by-layer coatings composed of heparin and collagen are proposed as an extracellular mimetic environment on nerve guide conduits (NGC) to modulate the behavior Schwann cells (hSCs). The authors evaluated stability, degradation over time, bioactivity six bilayers heparin/collagen coatings, denoted (HEP/COL)
A combination of high-energy ball milling, vacuum filtering, and sedimentation processes has been demonstrated to be a useful approach reduce, in controlled way, the length as-cast Fe73.5Si13.5Nb3Cu1B9 amorphous magnetic microwires (MWs) annealed material at 550 °C nitrogen conditions. Homogeneous compositional microstructures with fairly narrow size distributions between 1300 11.7 μm are achieved, exhibiting tunable response as soft microwave absorber. From perspective, character is...
Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix are synthesized by novel two-step surfactant sol-gel strategy, where the processes of hydrolysis, polycondensation and drying take place one-pot. The present approach is based on combined action oleic acid oleylamine, which act sterically precursor micelles when densification temperature performed reducing atmosphere. structural magnetic evolution formed compounds investigated, ranging from iron oxides such as...
The purpose of this work is to fabricate self-assembled microstructures by the sol-gel method and study morphological, structural compositional dependence ε-Fe2O3 nanoparticles embedded in silica when glycerol (GLY) cetyl-trimethylammonium bromide (CTAB) are added as steric agents simultaneously. combined action a polyalcohol surfactant significantly modifies morphology sample giving rise different microstructure each studied cases (1, 3 7 days magnetic stirring time). This due fact that...
Abstract Scalable fabrication of magnetic 2D materials and heterostructures constitutes a crucial step for scaling down current spintronic devices the development novel applications. Here, we report on van der Waals (vdW) epitaxy layered metal Fe 3 GeTe 2 (FGT)—a crystal with highly tunable properties high prospect room temperature ferromagnetism (FM)—directly graphene by employing molecular beam epitaxy. Morphological structural characterization confirmed realization large-area, continuous...
Epsilon iron oxide (ε-Fe2O3) coatings on Si(100) substrates are obtained by an easy one-pot sol-gel recipe assisted glycerol in acid medium. Glycerol, given its small dimensions, enables the formation of ε-Fe2O3 nanoparticles with a size few nanometers and highest purity is reached after densification treatment at 960 °C. The structural compositional evolution up to 1200 °C studied confocal Raman microscopy X-ray absorption spectroscopy techniques, correlating existing magnetic properties....
Bismuth Layer-Structured Ferroelectric (BLSF) materials with Bi4Ti3O12 composition exhibit high ferroelectricity, potential for high-temperature piezoelectricity, and the puzzle of low polarizability, explored via textured ceramics domain configurations. Here, we show that a distinctive stripe configuration 90° domains emerges large platelet-like grains, while smallest possessing more equiaxial morphology, needle-like structure significantly impacts ferroelectric properties ceramics. The...