A5004466141- Catalytic Processes in Materials Science
- Catalysts for Methane Reforming
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- Magnetic properties of thin films
- Gold and Silver Nanoparticles Synthesis and Applications
- nanoparticles nucleation surface interactions
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Catalysis and Oxidation Reactions
- Liquid Crystal Research Advancements
- Nanoporous metals and alloys
- Characterization and Applications of Magnetic Nanoparticles
- Pickering emulsions and particle stabilization
- Advanced Materials and Mechanics
- Supercapacitor Materials and Fabrication
- Copper-based nanomaterials and applications
- Nanocluster Synthesis and Applications
- Nanowire Synthesis and Applications
- Theoretical and Computational Physics
- Anodic Oxide Films and Nanostructures
Université de Toulouse
2015-2024
Laboratoire de Physique et Chimie des Nano-Objets
2015-2024
Université Toulouse III - Paul Sabatier
2014-2024
Centre National de la Recherche Scientifique
2015-2024
Hôpital Rangueil
2021
Institut National des Sciences Appliquées de Toulouse
2006-2021
Laboratoire de Chimie de Coordination
2001-2006
Universidad de Valladolid
1999-2000
Abstract The use of magnetic nanoparticles to convert electromagnetic energy into heat is known be a key strategy for numerous biomedical applications but also an approach growing interest in the field catalysis. heating efficiency limited by poor properties most them. Here we show that new generation iron carbide controlled size and with over 80 % crystalline Fe 2.2 C leads exceptional properties, which are much better than currently available nanoparticles. Associated catalytic metals (Ni,...
Nanostructures are considered as chemical systems of high potential owing to their unusual properties at the interface those molecular species and bulk metals. Consequently, they promising candidates for application in different domains such catalysis, magnetism, medicine, opto-electronics or sensors. The control characteristics nanostructures is a fundamental prerequisite if one envisages exploring physical since vary dramatically with size, shape surface state. Thus, development efficient...
Abstract Decomposition of the organometallic precursor [In(η 5 ‐C H )] in toluene presence methanol (8 vol.‐%) at room temperature leads to immediate formation aggregates indium nanoparticles 15 ± 2 nm mean diameter. The are roughly spherical with a size 400 40 nm. particles were characterized by means transmission electron and high‐resolution microscopies (TEM HRTEM), X‐ray diffraction (XRD) studies indicate that powder consists tetragonal phase indium. thermal oxidation air these yields...
Best of both worlds: Reduction an organometallic Co precursor on preformed CdSe nanorods yields two distinct semiconducting-magnetic heterostructures (see picture). The selective growth the tips first gives nanosphere-nanorod dimers, which evolve into nanorod-nanorod structures. In hybrid objects magnetic properties remain intact, while luminescence are affected but not completely quenched.
Magnetic heating by nanoparticles has recently been successfully employed in heterogeneous catalysis. In such processes, the maximum temperature that can be reached depends on Curie (Tc) of material. Here, order to extend range accessible temperatures and consequently possible reactions, those requiring high temperatures, we developed fully characterized a series FeCo containing different concentrations cobalt, tune their magnetic properties Tc. Their efficiency is compared iron carbide...
Magnetically induced catalysis using magnetic nanoparticles (MagNPs) as heating agents is a new efficient method to perform reactions at high temperatures. However, the main limitation lack of stability catalysts operating in such harsh conditions. Normally, above 500 °C, significant sintering MagNPs takes place. Here we present encapsulated FeCo and Co NPs carbon (Co@C FeCo@C) an ultrastable material suitable for high-temperature catalysis. Indeed, FeCo@C or mixture FeCo@C:Co@C (2:1)...
Spontaneous decomposition of [In(η5-C5H5)] in the presence poly(vinyl pyrrolidone) or trioctylphosphane oxide (TOPO) as a stabilizer gave monodisperse indium nanoparticles with mean diameter about 5–6 nm. In case TOPO, self-organization two- and three-dimensional superlattices is observed (see picture).
Au Co-ntraire: The growth of gold nanoparticles on magnetic cobalt nanorods could be initiated either selectively the tips (see picture, left) or nonselectively over whole nanorod surface (right) by proper choice ligand concentration and temperature. Heterogeneous nucleation was selected galvanic displacement gold(I) precursor. Supporting information for this article is available WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z702017_s.pdf from author. Please note: publisher not...
The control of nanocrystal structures at will is still a challenge, despite the recent progress colloidal synthetic procedures. It common knowledge that even small modifications reaction parameters during synthesis can alter characteristics resulting nano-objects. In this work we report an unexpected factor which determines structure cobalt nanoparticles. Nanocrystals distinctly different sizes and shapes have resulted from stock solutions containing exactly same concentrations...
Magnetic nanoparticles are important tools for biomedicine, where they serve as versatile multifunctional instruments a wide range of applications. Among these applications, magnetic hyperthermia is special interest the destruction tumors and triggering drug delivery. However, many applications require high-quality displaying high specific absorption rates (SARs), which remains challenge today. We report here functionalization stabilization in aqueous media highly 15 nm iron carbide...
Heating magnetic nanoparticles with high frequency fields is a topic of interest for biological applications (magnetic hyperthermia) as well heterogeneous catalysis. This study shows why FeC NPs similar structures and static properties display radically different heating power (SAR from 0 to 2 kW g-1). By combining results Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS) time-dependent high-frequency measurements, we propose model describing the mechanism in...
The synthesis of nanoparticles has experienced a huge development over the past 20 years. However, this remained relatively limited to few classes nanomaterials such as iron oxides, semi-conducting plasmonic (essentially Au) and quantum dots. In these cases, physical chemistry approach standard recipes allow good control size shape resulting nano-objects. organometallic precursors have emerged an important class allowing preparation large variety nano-objects, concerning number elements...
Abstract The Fischer–Tropsch synthesis (FTS) is a structure‐sensitive exothermic reaction that enables catalytic transformation of syngas to high quality liquid fuels. Now, monolithic cobalt‐based heterogeneous catalysts were elaborated through wet chemistry approach allows control over nanocrystal shape and crystallographic phase, while at the same time heat management. Copper nickel foams have been employed as supports for epitaxial growth hcp‐Co nanowires directly from solution containing...
Magnetic nanoparticles have been used as heating agents in CO<sub>2</sub> methanation under continuous flow catalyzed by nickel (Ni/SiRAlOx).
Abstract Carbon capture and utilization represents a promising strategy to meet the global energy climate goals. Under specific conditions, CO 2 catalytic hydrogenation with renewable H can transform waste into chemical feedstock for added‐value carriers chemicals. ‐Fischer–Tropsch synthesis‐based‐hydrocarbons should contribute creation of circular carbon economy significant impact on anthropogenic emission atmosphere. This review summarizes progress achieved toward single‐step long‐chain...
We report on the synthesis and preparation of oriented nanomaterials single crystalline metallic Co nanorods 6 nm in diameters two different aspect ratios (7 15). They display optimized magnetic properties, with a spontaneous magnetization just below bulk one, large coercive fields (up to 6.5 kOe at 300 K) as result coherent switching (i.e., Stoner Wohlfarth mechanism). measured strong effective anisotropy very close expected value resulting from sum shape magnetocrystalline contributions.
We present a new approach for homogeneous real-time immunodiagnostics (denoted as “PlasMag”) that can be directly carried out in sample solutions such serum, thus promising to circumvent the need of preparation. It relies on highly sensitive plasmon-optical detection relaxation dynamics magnetic nanoparticles immersed solution, which changes when target molecules bind surfaces due increase their hydrodynamic radii. This method requires hybrid combine both and optical anisotropic properties....
Abstract The Fischer‐Tropsch reaction transforms syngas into high added value products, among which liquid fuels. Numerous parameters determine catalytic activity and selectivity towards the most desired hydrocarbons. performances of cobalt‐based catalysts used in are known to depend critically on Co particle size crystallographic phase. Here, we present a comparative study Co‐based supported three carbon supports: multi‐wall nanotubes, nanofibers fibrous material. Our results show that,...