Christian Fernandéz
A5031114111- Advanced NMR Techniques and Applications
- Zeolite Catalysis and Synthesis
- Solid-state spectroscopy and crystallography
- Chemical Synthesis and Characterization
- NMR spectroscopy and applications
- Mesoporous Materials and Catalysis
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Catalysis and Oxidation Reactions
- Atomic and Subatomic Physics Research
- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Advanced MRI Techniques and Applications
- Catalysis and Hydrodesulfurization Studies
- Polyoxometalates: Synthesis and Applications
- Ionic liquids properties and applications
- Glass properties and applications
- Spectroscopy and Chemometric Analyses
- Advanced Battery Materials and Technologies
- Crystallization and Solubility Studies
- Dark Matter and Cosmic Phenomena
Laboratoire Catalyse et Spectrochimie
2010-2021
Centre National de la Recherche Scientifique
2009-2021
Université de Caen Normandie
2011-2021
École Nationale Supérieure d'Ingénieurs de Caen
2010-2021
Normandie Université
2016-2021
Digital Health Cooperative Research Centre
2019
Radiation Oncology Associates
2019
Digital China Health (China)
2019
Laboratoire de Réactivité de Surface
2009
École Normale Supérieure de Lyon
2009
Abstract The isomerization of o ‐xylene, a prototypical example shape‐selective catalysis by zeolites, was investigated on hierarchical porous ZSM‐5. Extensive intracrystalline mesoporosity in ZSM‐5 introduced controlled silicon leaching with NaOH. In addition to the development secondary porosity, treatment also induced substantial aluminum redistribution, increasing density Lewis acid sites located at external surface crystals. However, strength remaining Brønsted not changed. mesoporous...
We present the final results of spin asymmetries A1 and structure functions g1 proton deuteron in kinematic range 0.0008<x<0.7 0.2<Q2<100GeV2. For determination A1, addition to usual method which employs inclusive scattering events includes a large radiative background at low x, we use new minimizes by selecting with least one hadron as well muon state. find that this gives smaller errors for x<0.02, so it is combined provide optimal set results.Received 18 May...
We have measured the spin-dependent structure function g1p in inclusive deep-inelastic scattering of polarized muons off protons, kinematic range 0.003<x<0.7 and 1GeV2<Q2<60GeV2. A next-to-leading order QCD analysis is used to evolve g1p(x,Q2) a fixed Q02. The first moment at Q02=10GeV2 Γ1p=0.136±0.013 (stat) ±0.009 (syst) ±0.005 (evol). This result below prediction Ellis-Jaffe sum rule by more than two standard deviations. singlet axial charge a0 found be 0.28±0.16. In Adler-Bardeen...
Chemical etching with fluoride ions is a new approach for secondary porosity engineering of aluminosilicate zeolite frameworks. We show that diluted HF solutions extract preferentially aluminum from The Brønsted acidity ZSM-5 treated in such way decreases, while its structure unaffected after an treatment. With higher concentrations, the number undissociated molecules and concentration HF2– ions, extracting indiscriminately Al Si, increase. addition NH4F shifts chemical equilibria to produce...
Zeolites are widely used in industrial processes, mostly as catalysts or adsorbents. Increasing their micropore volume could further improve already exceptional catalytic and separation performances. We report a tunable extraction of zeolite framework cations (Si, Al) on faujasite-type zeolite, the archetype molecular sieves with cages most catalyst sorbent; this results ca. 10% higher limited impact its thermal stability. This increased from opening some small (sodalite) cages, otherwise...
This study reports the seeded synthesis of MFI‐type (ZSM‐5) zeolite in fluoride medium at pH = 8.5. Crystal growth kinetics resulting (ZSM‐5‐F) as a function seed content and crystallization temperature is studied. The time reduced to 1.5 h crystals with sizes below 200 nm Si/Al ratio 23.6 are obtained. A similar characteristics but synthesized hydroxyl (ZSM‐5‐OH) used evaluate ZSM‐5s different media. Their physicochemical properties compared particular attention paid nature, number,...
We present a new measurement of the spin-dependent structure function g1d deuteron in deep inelastic scattering 190 GeV polarised muons on deuterons, kinematic range 0.003 < x 0.7 and 1 GeV2 Q2 60 GeV2. This is found to be negative at small x. The first moment Γ1d=∫01g1ddx evaluated Q02 = 10 0.034 ± 0.009 (stat.) 0.006 (syst.). value below Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination Γ1p, we obtain Γ1p − Γ1n 0.199 0.038 which agrees with Bjorken rule.
We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering polarised muons on protons deuterons in the range 0.003<x<0.7 Q2>1 GeV2. Compared to our previous publication this subject, with new data statistical errors have been reduced by nearly factor two. From these inclusive we determine quark distributions valence quarks non-strange sea at Q2=10 The u distribution, Δuv(x), is positive polarisation increases x. d...
The use of organic structure directing agents in zeolite syntheses has dramatically extended the number types during past decades. However, for about 20% all known types, necessary postsynthesis elimination templates by high-temperature combustion leads to collapse, where particularly strongly affected are Ge-rich zeolites. Here, we present a treatment approach that stabilization postsynthetic isomorphous substitution Al Ge. An important advantage this new method is no preliminary agent from...
We present a next-to-leading order QCD analysis of the presently available data on spin structure function g1 including final from Spin Muon Collaboration. results for first moments proton, deuteron, and neutron functions, determine singlet nonsinglet parton distributions in two factorization schemes. also test Bjorken sum rule find agreement with theoretical prediction at level 10%.Received 18 May 1998DOI:https://doi.org/10.1103/PhysRevD.58.112002©1998 American Physical Society
Up to now the distribution of Al atoms in zeolite lattice could be monitored mainly by 29Si MAS NMR. The data about nonequivalent aluminium T sites, present 27Al NMR spectra, was obscured second-order effects quadrupolar interaction. By applying five-quantum MQMAS method ZSM-5 type zeolites, we were able distinguish at least two sites H-ZSM-5 and establish relation between 27Al, 29Si, 1H data. Comparison with spectra gives information siting framework.
We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in final state. Two methods event classification are used to increase contribution photon-gluon fusion process above 30%. The most effective one, based on neural network approach, provides asymmetries Al→NlhhXp=0.030±0.057(stat)±0.010(syst) and Al→NlhhXd=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon...