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Benoit Coasne (CNRS/Univ. Grenoble Alpes)02/06/2025, 15:45Oral
Beyond well-documented confinement and surface effects arising from the large internal surface and severely confining porosity of nanoporous hosts, the transport of nanoconfined fluids remains puzzling by many aspects. With striking examples such as memory, i.e. non-viscous, effects, intermittent dynamics and surface barriers, the dynamics of fluids in nanoconfinement challenges classical...
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Armand Devillez (Université Grenoble Alpes, CNRS, Institut Néel, 38042 Grenoble, France)02/06/2025, 16:00Oral
Following the proposed materialization of Kitaev-bond-dependent spin liquid physics in honeycomb lattices of heavy transition metals with 4d or 5d electrons [1], it has been proposed that this can be extended to 3d transition metals, in particular Co2+ [2]. A first step in validating the prospect of finding a quantum spin liquid is to demonstrate the presence of these anisotropic...
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Dr Fabrice Cousin (Laboratoire Léon Brillouin)02/06/2025, 16:15Oral
We will show in this contribution how the combination of SANS and SAXS allows for a detailed monitoring of the respective evolutions of the structure of fillers by SAXS and conformation of polymeric chains by SANS under uniaxial stretching at various elongation ratios in a nanocomposite made of spherical magnetic nanoparticles of γFe2O3 dispersed in a matrix of polystyrene (PS) chains [1]. The...
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Nathan BUJAULT (Institut Neel, CNRS & Univ. Grenoble Alpes)02/06/2025, 16:30Oral
Dy2Ti2O7 and Ho2Ti2O7 classical spin ice compounds have been extensively studied over the past 30 years. Their excitations, described as emergent magnetic monopoles, exhibit very slow dynamics at low temperature, which manifests by a freezing and a strong irreversibility in Zero Field Cooled - Field Cooled (ZFC-FC) magnetization measurements. It has been proposed that in spin ices made of...
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Celine Durniak (European Spallation Source ERIC)02/06/2025, 16:45Oral
The European Spallation Source (ESS) will operate a suite of diffractometers. One of the first operational instruments will be DREAM [1], a diffractometer developed and built for ESS by the consortium Forschungszentrum Jülich (Germany) and Laboratoire Léon Brillouin (France).
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To ensure smooth operation even for the first-time users, the ESS Data Management and Software Centre is developing an... -
Sophie Combet (CNRS)03/06/2025, 13:15Oral
Membrane proteins play essential roles in cellular function and are prime therapeutic targets, yet their structural characterization remains a major challenge. Despite advances in artificial intelligence, including AlphaFold, accurately predicting their structures is still difficult. These proteins make up 30% of the proteome and 60% of drug targets, yet they are vastly underrepresented in the...
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Lorenzo Metilli (Laboratoire Léon Brillouin)03/06/2025, 13:30Oral
Small-angle neutron scattering (SANS) is a ubiquitous technique for the study of static & dynamic properties of condensed matter at the mesoscale. The ever-increasing demand in SANS beamtime requires the development of new instruments with high scientific throughputs.
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The SAM project was submitted in that spirit during the 'Endurance 2' call of the Institut Laue Langevin (ILL). The... -
Gozde Oney (CEA-IRIG)03/06/2025, 13:45Oral
L’imagerie neutronique, sensible aux noyaux atomiques plutôt qu’à la densité électronique, constitue un outil puissant pour l’étude des batteries Li-ion, permettant notamment d’observer des éléments peu détectables par les rayons X, comme l’hydrogène et le lithium-6. Dans cette étude, nous exploitons cette technique pour analyser la distribution locale du lithium et identifier les...
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Dr Felix MORINEAU (Institut Néel)03/06/2025, 14:00Oral
Pyrochlore oxides with the formula R2M2O7 (R representing a rare-earth element and M a metal ele-ment) consist of two interpenetrating pyrochlore lattices, and are a rich playground to stabilize unconven-tional magnetic frustrated phases [1]. In this family, Nd-based compounds exhibit intriguing physics due to the dipolar-octupolar nature of the Nd3+ ground state doublet [2]. In particular, at...
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Dr Florence PORCHER (ESS, Lund (Sweden) & LLB, CEA/Saclay (France))03/06/2025, 14:15Oral
The modelling of adsorption or confinement of organic molecules in zeolite crystals is a long story, not only because of the infinite possibilities offered by the intrinseque properties of the guest molecules and of the framework topologies.
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The simplest family of such inclusion compounds is probably the (dye@zeolite) one. A priori the properties arising from the inclusion of simple dyes,... -
Lucas Fine (ILL)04/06/2025, 11:00Oral
Hydride-ion (H-) conductors attract more and more interest for their potential application as solid electrolytes in, e.g., batteries, fuel cells, and for catalysis. A particularly promising class of hydride-ion conductors are nitride-hydrides, which accommodate both nitride ions and hydride ions in the same substructure. Recently, the new nitride-hydride $\mathrm{Ca_3CrN_3H}$ was discovered...
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Christian Beck04/06/2025, 11:15Oral
Background:
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Understanding the diffusive properties of colloidal suspensions is essential for exploring fundamental transport mechanisms, optimizing industrial formulations, developing advanced materials, and enhancing biomedical and pharmaceutical applications. Short-time diffusion is predominantly influenced by hydrodynamic interactions. Quasielastic neutron scattering (QENS) offers a... -
Pascale Launois (Laboratoire de Physique des Solides)04/06/2025, 11:30Oral
Hydrogen is the carbon-free fuel par excellence because its combustion emits only water. Research has focused on H2 storage in lightweight materials for the needs of vehicles, excluding clays due to their weight. But large-scale terrestrial storage for industrial applications does not require the same specifications. In this context, clay minerals offer several interesting properties, such as...
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Cyril PICARD (UGA)04/06/2025, 11:45Oral
Deformation of superhydrophobic cylindrical mesopores is studied during a cycle of forced water filling and spontaneous drying by in situ small-angle neutron scattering. A high-pressure setup is put forward to characterize the deformation of ordered mesoporous silanized silica up to 80 MPa. Strain isotherms of individual pores are deduced from the shift of the Bragg spectrum associated with...
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Hugo RONCIN (CEA)04/06/2025, 15:30Oral
For two decades, pharmaceutical industries have developed a growing interest towards nanoparticles (NPs). The combination of pharmaceutical activity and nanoscale formulation offers many advantages such as better targeting and reduced toxicity of the drug, improvement of the pharmacokinetic to cite a few. However, the limited knowledge regarding some of their physicochemical characteristics...
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Alexandre Ivanov (ILL), Benoît Fauqué (Collège de France), Bertrand Roessli (Paul Scherrer Institut), Eric Ressouche (Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38042 Grenoble, France), Francoise Damay (LLB), Françoise Le Berre (Institut des Molécules et Matériaux du Mans), Dr Frederic Bourdarot (CEA-Grenoble), Jérôme Lhoste (Institut des Molécules et Matériaux du Mans), OLIVIER DEMORTIER (Laboratoire Léon Brillouin, CEA Saclay), Romain Sibille (Paul Scherrer Institut), Sylvain Petit (LLB CEA-CNRS-Université Paris-Saclay), Tom Fennell (Paul Scherrer Institut), claire colin (Institut Néel, CNRS & Université Grenoble Alpes)04/06/2025, 15:45Poster
KTb3F10 is a terbium-based compound with a cubic structure (Fm-3m space group), in which the magnetic Tb ions form an unusual network of corner sharing octahedra [1-4]. Tb ions sit on the 24e Wyckoff site (C4n point group) and are surrounded by 8 fluorine atoms, forming a slightly distorted dodecahedra cage. Interestingly, because of the cubic three-fold symmetry, there are three possible...
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Suzanne Lafon (LIPHY, CNRS)04/06/2025, 16:00Oral
Controlling the structure of polymer solutions near a solid surface is crucial for many industrial processes as it significantly impacts solution flow and influences slip at the interface. To date, only a few techniques have been developed to experimentally investigate this type of interface at the nanometric scale of solid/liquid interactions. In this study, we probe the interface between a...
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Shiyu Deng (Institut Laue-Langevin)04/06/2025, 16:15Oral
We report the emergence of a polar metal phase in layered van der Waals compound FePSe$_3$. This Mott insulator with antiferromagnetic order offers a unique opportunity to fully tune an insulator into a polar metal state with pressure, without doping-induced disorder or impurities. Our synchrotron and neutron diffraction data unambiguously show a structural transition and loss of the inversion...
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Xavier FABREGES (Laboratoire Léon Brillouin, CEA/CNRS Saclay, France)04/06/2025, 16:30Oral
Since the shutdown of the Orphée reactor, France is missing a national neutron facility to support its scientific community. Neutron sources worldwide are progressively transitioning from traditional reactor-based sources (such as ILL, Orphée, and FRM II) to pulsed sources (ESS, SNS, J-PARC). In parallel, the development of High Current Accelerator-driven Neutron Sources (HiCANS) offers a...
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Cecilia Herrero Guillen (Institut Laue Langevin)04/06/2025, 17:00Oral
Fluids at solid interfaces are central to key technologies in energy conversion, electrochemistry, and catalysis, yet their nanoscale dynamics remain only partially understood. On metallic surfaces, recent studies have revealed unconventional interfacial phenomena—including complex electrostatic screening, anomalous wetting behavior, and quantum friction—that call for new modeling tools...
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Bruno Guerard (ILL)04/06/2025, 17:15
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Thomas Zemb (CEA/ICSM)04/06/2025, 17:30Oral
SAXS emerged in India in the group of Raman, then in the fifties of Kratky centered on the study of the empty cell by André Guinier in France and a dialogue of Kratky and Porod with Svedberg about proteins in solution. In the seventies and eighties absolute scaling at low-q and asymptotic laws at high-q started to be measured and were concomitant to the birth of science at nano-scale. ...
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Christiane Alba-Simionesco (LLB)Oral
We present a novel in situ sample environment for neutron scattering, inspired by soft matter techniques but to our knowledge never before implemented at large-scale facilities. Based on controlled centrifugation, this setup enables the application of accelerations from 1000 to 5000 g, generating stable density gradients that induce phase transformations and nanophase separation directly...
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Bruno Guerard (ILL)
The XtremeD, D16, and D20 instruments have recently been equipped with large-area, curved, position-sensitive 33He neutron detectors based on the Trench-MWPC (Multi-Wire Proportional Chamber) technique, initially introduced at the ILL in 2017. These detectors offer a unique combination of wide angular coverage, high spatial resolution, and excellent counting rate capabilities. Their...
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