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DTSTART;TZID=Europe/Paris:20260721T140000
DTEND;TZID=Europe/Paris:20260721T150000
DTSTAMP:20260709T121303Z
CREATED:20260709T121303Z
LAST-MODIFIED:20260709T121303Z
UID:10000218-1784642400-1784646000@sfp-alpes.fr
SUMMARY:Ben HUMPHREYS (Institut Laue-Langevin (ILL) Grenoble\, France)
DESCRIPTION:Advancing our Understanding of Responsive Polymer Brushes\nRésumé : \n\nInterfacial properties of a surface can be extensively modified through the addition of a polymer brush layer; a dense array of end-tethered polymers grafted to a surface. When a polymer brush is synthesised with a stimulus responsive polymer\, the surface properties can be tailored to respond\, often reversibly\, to external stimuli such as temperature\, light\, pH\, solvent or electric fields. While these so-called smart materials are particularly promising for high-value applications such as sensors\, nanoactuation and microfluidics\, their response can be significantly influenced by additives such as osmolytes and salts. Unlike untethered polymer systems\, research into the influence of additives for responsive polymer brushes has been sparse\, yet this knowledge is crucial when advancing their utilisation in biomedical and industrial applications. \nThroughout my research career I have primarily focused on the influence of salts and osmolytes on temperature and pH responsive homo- and co-polymer brushes. I will firstly discuss my synthetic methodologies and choice of responsive polymers. This will be followed by a comprehensive outline of the approaches used to investigate these responsive coatings. Here\, starting with the simplest systems\, then gradually increasing complexity\, I have been able to systematically understand the influence of individual additives/changes. This information is invaluable when considering the complex real-world applications that can benefit from the utilisation of smart\, responsive polymer brush surface coatings. \nShort Bio/CV\nIn 2015 I graduated from the University of Newcastle\, Australia\, with a Bachelor of Science\, 1st class honors\, majoring in Chemistry\, followed by my PhD at the same university (2015-2019) titled “Nanostructure of Temperature Responsive Polymer Brushes Modulated by Salt Identity”. I then accepted a post-doc position at Lund University in Sweden\, investigating the internal structural changes of a triglyceride film throughout enzymatic digestion\, with particular focus on the influence of pH and how this influences the species present throughout the lipolytic process. In 2023 I started in my current position as instrument responsible for the D17 neutron reflectometer at the ILL where I have re-established my research on responsive polymer brushes with a focus on osmolyte and salt additives in aqueous solutions. \n_ \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/ben-humphreys-institut-laue-langevin-ill-grenoble-france/
LOCATION:LMGP – salle des séminaires\, Grenoble INP -Phelma 3 parvis Louis Néel\, Grenoble\, 38054\, France
CATEGORIES:Séminaire
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
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DTSTART;TZID=Europe/Paris:20260831T140000
DTEND;TZID=Europe/Paris:20260831T150000
DTSTAMP:20260709T120641Z
CREATED:20260709T120641Z
LAST-MODIFIED:20260709T120641Z
UID:10000217-1788184800-1788188400@sfp-alpes.fr
SUMMARY:Sasha CHERNYSHEV (University of California\, Irvine\, USA)
DESCRIPTION:BaCo₂(AsO₄)₂ : Strong Kitaev\, After All\nRésumé : \nBaCo₂(AsO₄)₂ – a magnetic compound first studied some 50 years ago—has long been a mystery. Its spectrum is incompatible with the theory that this material was supposed to verify\, and its magnetic order is discrepant and easily destroyed by an exceptionally low magnetic field. All these traits have perplexed theorists and experimentalists alike. The mystery had to wait for breakthroughs such as the development of the novel concept of « Kitaev magnetism » in the late 2000s. It had to wait even longer as the first\, more obvious Kitaev candidates were studied\, before researchers turned their attention to the cobaltate family. Only recently did the stars align to enable a comprehensive analysis of this enduring enigma. Our work [1] has provided exactly that: it propelled BaCo₂(AsO₄)₂ to the forefront of research as a champion among Kitaev magnets\, while bringing its multifaceted conundrums close to a complete resolution by reconciling its puzzling magnetic state\, spectrum\, and low critical field with the phenomenology of the proposed model. \n[1] P. A. Maksimov\, S. Jiang\, L. P. Regnault\, and A. L. Chernyshev\, Phys. Rev. Lett. 135\, 066703 (2025). (Editors’ Suggestion). \n_ \nArno Hiess (College 4 Secretary) \nExternal visitors may ask for a site access to tellier(at)ill.fr \nZoom link : https://ill.zoom.us/j/94822992547?pwd=STd44Z3otZU5k1DXbwobbeLtQPJJq2.1 – Password : SeminarC4
URL:https://sfp-alpes.fr/event/sasha-chernyshev-university-of-california-irvine-usa/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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