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DTSTART;TZID=Europe/Paris:20260630T103000
DTEND;TZID=Europe/Paris:20260630T113000
DTSTAMP:20260326T145855Z
CREATED:20260326T145827Z
LAST-MODIFIED:20260326T145855Z
UID:10000113-1782815400-1782819000@sfp-alpes.fr
SUMMARY:Carlotta PORZIO (CERN\, Switzerland)
DESCRIPTION:Experimental activities at the ISOLDE-CERN facility\nRésumé : \nThe ISOLDE factily at CERN is one of the world-leading laboratories for the production of radioactive ion beams (RIBs) with the ISOL (Isotope Separation On-Line) method. More than 1000 isotopes of over 70 chemical elements have been produced via the interaction of a 1.4 GeV proton beam with a variety of target materials. After ionization and mass separation\, the beams can be delivered at low energy or post-accelerated up to about 10 MeV/u using the HIE-ISOLDE linear accelerator. The facility supports a broad scientific program\, spanning nuclear structure studies\, nuclear astrophysics\, materials science\, life sciences\, and investigations of fundamental interactions. \nAmong the experimental setups available at HIE-ISOLDE\, the Miniball gamma-ray spectrometer is employed to investigate both collective and single-particle properties of exotic nuclei. Combined with the post-accelerated radioactive ion beams\, Miniball enables nuclear structure studies via Coulomb excitation and nucleon-transfer reactions. \nThis seminar will provide an introduction to the ISOLDE facility and the ISOL RIB production method\, and an overview of experimental setups and techniques\, with a focus on the Miniball spectrometer. \n— \nHanno Filter (College 3 Secretary \nExternal visitors may ask for a site access to tellier@ill.fr \n 
URL:https://sfp-alpes.fr/event/carlotta-porzio-cern-switzerland/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260630T140000
DTEND;TZID=Europe/Paris:20260630T150000
DTSTAMP:20260625T132929Z
CREATED:20260625T132929Z
LAST-MODIFIED:20260625T132929Z
UID:10000203-1782828000-1782831600@sfp-alpes.fr
SUMMARY:Clàudia PEREZ JUNYENT (GCM’s Group\, Department of Physics\, & IMEM-BRT’s Group\, Department of Chemical Engineering\, Barcelona\, Spain)
DESCRIPTION:Dynamic disorder and phase behavior in long alkylammonium metal halides\nRésumé : \nwo-dimensional hybrid organic–inorganic perovskites with general formula (CₙH₂ₙ₊₁NH₃)₂MX₄ are promising solid-solid phase change materials (SS-PCMs) for thermal energy storage (TES) due to their sharp\, reversible first-order phase transitions with large latent heats. These transitions originate from cooperative order-disorder processes within the organic sublattice\, a mechanism known as pseudo-melting. As reported in the literature\, the transition temperature increases with alkyl chain length\, providing a means to tune the operating temperature. However\, long-chain compounds (n ≥ 16) have remained largely unexplored\, despite being expected to display transitions in the 80-110 °C range relevant for medium-temperature TES applications such as industrial waste heat recovery in food processing\, textiles and paper sectors. \nWhile calorimetric measurements confirm the thermodynamic potential of these materials\, the microscopic mechanisms driving the phase transitions remain poorly understood\, particularly for long chains (n ≥ 16). Establishing a molecular-level description of the order–disorder process is essential to understand what governs the transition temperature and latent heat\, and to rationally design materials with improved thermal performance. In this work\, we address this gap through a comprehensive characterization combining calorimetry\, vibrational spectroscopy\, and neutron scattering of newly synthesized (CₙH₂ₙ₊₁NH₃)₂CuBr₄ compounds with even n = 16-22. Variable-temperature Fourier-transform infrared spectroscopy identifies conformational rearrangements of the alkyl chains across the transition\, evidencing changes in intra- and intermolecular interactions consistent with enhanced chain mobility. Variable-temperature Raman spectroscopy tracks the evolution of vibrational modes associated with both the organic chains and the inorganic framework. Quasielastic neutron scattering directly probes hydrogen dynamics\, revealing a progressive activation of molecular motion near of the phase transition and confirming that dynamic disorder is the microscopic origin of the large latent heat. Together\, these results provide molecular-level understanding of structure–property relationships in long-chain hybrid perovskites needed to guide the design of tunable SS-PCMs for medium-temperature TES. \n_ \nGabriel Cuello (College 6 Secretary) \nExternal visitors may ask for a site access to Brigitte Dubouloz (dubouloz@ill.fr) \n  \n  \n 
URL:https://sfp-alpes.fr/event/claudia-perez-junyent-gcms-group-department-of-physics-imem-brts-group-department-of-chemical-engineering-barcelona-spain/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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