A5101797773- Catalytic Processes in Materials Science
- Laser Material Processing Techniques
- Catalysis and Oxidation Reactions
- Nanocluster Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Laser-induced spectroscopy and plasma
- Catalysis and Hydrodesulfurization Studies
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Ocular and Laser Science Research
- Nanomaterials for catalytic reactions
- Molecular Junctions and Nanostructures
- Hydrogen Storage and Materials
- Advanced Surface Polishing Techniques
- Zeolite Catalysis and Synthesis
- Laser-Matter Interactions and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Quantum Dots Synthesis And Properties
- Mesoporous Materials and Catalysis
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Gas Sensing Nanomaterials and Sensors
- Electrodeposition and Electroless Coatings
Consejo Nacional de Investigaciones Científicas y Técnicas
2014-2023
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
2014-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2022
Centre National de la Recherche Scientifique
2000-2022
Université de Bordeaux
2000-2022
Universidad Nacional de La Plata
2010-2021
Centre Lasers Intenses et Applications
2004-2020
Centro Científico Tecnológico - Tucumán
2018-2020
Rede de Química e Tecnologia
2019-2020
ALPhANOV (France)
2009-2017
published or not.The documents may come from teaching and research institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés. Improved laser glass cutting by spatio-temporal control of energy deposition using bursts femtosecond pulses
The nonequilibrium cation site occupancy in nanosized zinc ferrites $(\ensuremath{\sim}6--13\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ with different degree of inversion ($\ensuremath{\sim}0.2$ to 0.4) was investigated using Fe and Zn $K$-edge x-ray absorption near edge spectroscopy (XANES) extended fine structure, magnetic measurements. very good agreement between experimental ab initio calculations on the XANES region clearly shows large...
We report the synthesis, for first time, of small, highly monodisperse Cu5 clusters in water without any surfactant or protective agent. For this purpose, we used a new approach based on kinetic control reaction, which is achieved with an electrochemical method and using solution almost no conductivity (i.e., added electrolytes commonly methods). This allows application extremely small current densities needed to focus reaction synthesize only one selected cluster size. Clusters were...
Pt-Au bimetallic nanoparticles have been synthesized by the polyol method and stabilized with poly(vinylpyrrolidone) (PVP), modifying temperature of synthesis. Interesting structure changes were observed in as was varied. At lower temperatures no detected, but increased started to appear, commonly obtaining core-shell nanoparticles, always covered polymer. This originates modification optical response system UV-visible region. An absorption peak centered at 520 nm low (100-110 degrees C);...
This paper presents a detailed discussion of the structure tungsten phosphide and its relationship to simpler crystalline forms. The (space group Pbnm) is based on distorted hexagonal prisms with phosphorus atoms forming P−P chains. Measurements by 31P magic angle spinning nuclear magnetic resonance show that there only one type Knight shift 255 ppm from 85% H3PO4, which located in highly anisotropic environment. Numerical simulations extended X-ray absorption fine data at W L3-edge give...
This paper establishes the chemical nature of Pd nanoparticles protected by alkanethiolates that were prepared through a ligand place-exchange approach and two-phase method, first developed for Au Brust Schiffrin. After 10 years since study on this kind was published, surface composition particles is matter debate in literature it has not been unambiguously assessed. The studied means several techniques: UV–visible spectroscopy, scanning transmission electron microscopy, Fourier-transform...
Catalysts based on Na–mordenite (symbolized as "M") exchanged with 5, 10, and 15 wt % of Ag were characterized by X-ray photoelectron spectroscopy (XPS), extended absorption fine line structure (EXAFS), near edge (XANES) UV–vis diffuse reflectance (DRS) to investigate the effect different treatments chemical state surface concentration silver species. The AgxM catalysts analyzed in oxidizing (O2) or reducing (H2/Ar) atmospheres also after being used selective catalytic reduction NOx...
The decoration of semiconductors with subnanometer-sized clusters metal atoms can have a strong impact on the optical properties support. changes induced differ greatly from effects known for their well-studied, metallic counterparts in nanometer range. In this work, we study deposition Cu5 TiO2 surface and investigate influence photon-absorption nanoparticles via computational modeling decorated rutile (110) surface. Our findings are further supported by selected experiments using diffuse...
In this work, well-defined silica-supported Pt and PtSn catalysts were prepared by surface organometallic reactions characterized EXAFS-XANES at the L2,3 edge XPS of 4f Sn 3d levels. These tested in catalytic hydrogenation cinnamaldehyde liquid phase. results showed that PtSn−OM* (not having butyl groups anchored on surface), tin was present as Sn(0) adatoms "decorating" metallic surface, isolating atoms; PtSn−OM catalyst (Bu remain grafted found form Sn(II, IV) similar proportions. EXAFS...
In this paper, the synthesis of gold@gold(I)−thiolate core@shell nanoparticles is described for first time. The chemical nature and structure these were characterized by a multi-technique approach. prepared particles consist gold metallic cores, about 1 nm in size, surrounded stable gold(I)−thiomalate shells (Au@Au(I)−TM). These could be useful medicine due to interesting properties that has against rheumatoid arthritis. Furthermore, results give new insights characterization nanoparticles.
Ag<sub>5</sub>-induced formation of surface polarons at the Ag<sub>5</sub>–TiO<sub>2</sub> interface enables to reveal a general polarization phenomenon.
Abstract The system Mg(NH 2 ) + 2LiH is considered as an interesting solid-state hydrogen storage material owing to its low thermodynamic stability of ca. 40 kJ/mol H and high gravimetric capacity 5.6 wt.%. However, kinetic barriers lead slow absorption/desorption rates even at relatively temperatures (>180 °C). In this work, we investigate the effects addition K-modified Li x Ti y O z on behaviour system. comparison with pristine 2LiH, containing a tiny amount nanostructured shows...
Abstract Sub‐nanometer metal clusters have special physical and chemical properties, significantly different from those of nanoparticles. However, there is a major concern about their thermal stability susceptibility to oxidation. In situ X‐ray Absorption spectroscopy Near Ambient Pressure Photoelectron results reveal that supported Cu 5 are resistant irreversible oxidation at least up 773 K, even in the presence 0.15 mbar oxygen. These experimental findings can be formally described by...
The interaction of trains femtosecond microjoule laser pulses with dielectric materials by means a multi-scale model is investigated. Theoretical predictions are directly confronted experimental observations in soda-lime glass. It shown that due to the low heat conductivity, significant fraction energy can be accumulated absorption region. Depending on pulse repetition rate, material heated high temperatures even though single too induce modification. Regions above glass transition...
Aiming to improve the hydrogen storage properties of 2LiH + MgB<sub>2</sub>(Li-RHC), effect the<italic>in situ</italic>formed and low cost Li<sub>x</sub>TiO<sub>2</sub>is investigated.