Accueil > Séminaires
(39) Presentation(s) - Année 2022
Mar. 04/10/2022 10:00 Salle RdC, Bâtiment 11, RdC (à confirmer) ZARBON & FURTADO Aldo & Clascidia (UFPR Curitiba) Thin layers of nanomaterials prepared at liquid-liquid interfaces & Nanocarbon-biomolecule platforms for vaccines and biosensors (Nanostructures & Spectroscopie) Abstract Clascidia Furtado: The possibility of manipulating matter and controlling processes at the nanoscale, which overlaps the scale of biological structures and processes, has brought unprecedented advances in nanobiotechnologies. An example is the construction of multifunctional nanoplatforms, with special attention to those based on carbon nanostructures (nanotubes and graphenes) containing biomolecules (proteins, peptides, nucleic acids) or drugs anchored on their surface. They can outperform conventional molecular compounds due to their high reactivity and ability to undergo multiple functionalizations, generating technological solutions with high sensitivity, specificity and selectivity. In this talk, we will describe our group's efforts to 1) carefully obtain nanocarbon-protein/aptamer platforms for vaccine formulations and biosensors with response and diagnostic potential for cancer; and 2) understand nanomaterial-biomolecule interactions. Pour plus d'informations, merci de contacter Metz R. |
Mer. 26/10/2022 15:00 Andromede, Bâtiment 11, Etage 3 GUERRE Marc (Université Toulouse 3 – Paul Sabatier) Vitrimers : from polymer design to industrial applications Vitrimers are now commonly considered as the third class of polymer materials alongside thermoplastics and thermosets. At service temperature, vitrimers behave like traditional thermosets, with good mechanical characteristics but can be recycled, reshaped at high temperature similarly to glass. This discovery opens new green perspectives such as crack repairing, correction of moulding defects and depolymerisation/recycling using soft conditions. Nonetheless, the transfer from academia toward industry is not straigthforward and require extensive collaborative efforts from scientists and engineers in chemistry, materials science and engineering. Pour plus d'informations, merci de contacter Merindol R. |
Mar. 08/11/2022 10:00 Salle RdC, Bâtiment 11, RdC LAUNOIS-PAINEAU Pascale-Erwan (Paris) Confinement and photocatalysis in geo-inspired nanotubes (Nanostructures & Spectroscopie) Confinement and photocatalysis in geo-inspired nanotubes --------- Pour plus d'informations, merci de contacter Metz R. |
Mer. 09/11/2022 11:00 Salle des Séminaires, Bâtiment 21, Etage 4 BAUDIN Emmanuel (LPENS - Laboratoire de physqiue de l'ENS) The Electroluminescence of Graphene (Propriétés Electro-optiques des Nanomatériaux 1D/2D) In this seminar, I will present our recent discovery of graphene's electroluminescence in the middle infrared. Pour plus d'informations, merci de contacter Nanot S. |
Mer. 16/11/2022 09:45 Bâtiment 20 LE GALL Claire (Cavendish Laboratory, University of Cambridge) Present address: Microsoft research, Cambridge Quantum networks with quantum dot spin qubits (Physique de l'exciton, du photon et du spin) Quantum is booming, and established quantum platforms (superconducting circuits, trapped ions, Ry atom arrays and photons) are now moving to the realm of industry (IBM, IONQ, PasQal, and PsiQuantum). A key enabler to some of these approaches is a pristine spin-photon interface that allows entangling long-lived matter-based qubits with routable flying qubits in the form of photons. This talk will introduce you to the key concepts and challenges behind quantum computing and contextualize the sustained research efforts to develop the performance of candidate systems such as trapped ions, atomic impurities in solids and quantum dot spins. The talk will then focus on a specific platform: Optically active semiconductor quantum dots (QDs)--which have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei--and our most recent work on this platform [1]. In a nutshell, we demonstrated that a new generation of lattice-matched QD devices, with vanishing strain, allows dramatic prolongation of the electron spin coherence over conventional QD counterparts. The near two orders of magnitude improvement of electron spin coherence under dynamical decoupling, also attests of a coherence improvement of the electron-nuclear interface as a whole. We envisage this to enable the storage of quantum information in the nuclear spins, a vital resource towards memory-assisted quantum network protocol. Pour plus d'informations, merci de contacter Finco A. |
Mer. 16/11/2022 15:00 Andromede, Bâtiment 11, Etage 3 FIORI Matilde (Oxford) http://cwmacminn.com Impact of large periodic deformations on solute transport in soft porous media From soils to soft biological tissues, there are many examples of materials that can be modelled as highly deformable porous media, characterised by a strong coupling between mechanical stimulation and fluid flow due to complex rearrangements of the pore space. In both contexts – subsurface geomechanics and living-tissue biomechanics or tissue engineering – the effects of large periodic deformations on solute transport and mixing can be of great interest for predicting and/or controlling the motion of contaminants or nutrients. Here, we propose a 1D continuum model based on large-deformation poroelasticiy that links an applied periodic deformation to the resulting solute transport and mixing. Transport occurs through advection, molecular diffusion, and hydrodynamic dispersion, all of which are affected by the deformation in specific ways. We explore the effects of several dimensionless parameters on the problem, focusing on the ones regulating the applied periodic load. We find that the amplitude and period of deformation influence the mechanical response of the material, which can belong to either a linear slow-loading or a nonlinear fast-loading regime. These mechanical regimes directly characterise the resultant movements of solute. Pour plus d'informations, merci de contacter Merindol R. |
Lun. 28/11/2022 14:30 Batiment 20, Amphi ROLLO Maxime (Laboratoire Charles Coulomb) Capteurs quantiques à centres NV : vers de nouvelles modalités d'imagerie (Physique de l'exciton, du photon et du spin) La compréhension des phénomènes physiques et le développement technologique de composants et systèmes aux nano-échelles requièrent des outils de mesure résolus à ces échelles. Un moyen est d’utiliser des capteurs de très faibles volumes. Parmi ceux-ci, les capteurs s’appuyant sur les spins électroniques individuels associés au centre azote-lacune (ou centre NV pour Nitrogen-Vacancy en anglais) dans le diamant sont devenus une technique d’intérêt fort. Ces capteurs, de volume atomique, sont en effet extrêmement sensibles à plusieurs grandeurs physiques dans leur environnement. Ces grandeurs peuvent sonder en mesurant le spectre de résonance magnétique du spin électronique par des moyens optiques. Ces capteurs sont aujourd’hui employés pour cartographier des champs magnétiques statiques avec une sensibilité en deçà du µT/√Hz et une résolution spatiale de l'ordre de 50 nm en conditions ambiantes. Pour plus d'informations, merci de contacter Finco A. |
Ven. 02/12/2022 14:30 Room SC12.01 FABRE Florentin (Laboratoire Charles Coulomb) Capteurs quantiques pour l'étude de matériaux bidimensionnels magnétiques (Physique de l'exciton, du photon et du spin) La recherche sur les matériaux de van der Waals est un sujet important en physique de la matière condensée. Depuis les premières exfoliations du graphene en 2004, la famille des matériaux de van der Waals s’est agrandie de manière extrêmement rapide, couvrant une large gamme de propriétés physiques différentes, des matériaux isolants au semi-metaux, en passant par les semi-conducteurs. Ces matériaux hébergent de plus des phénomènes tels que la supraconductivité, ou encore le fort couplage spin-vallée dans les dichalcogénures de métaux de transition. En parallèle, un second domaine s’est aussi développé de manière rapide : les hétérostructures de van der Waals. Il consiste à empiler des matériaux bi-dimensionnels, couche par couche, dans un ordre bien précis. Ces structures offrent la possibilité de combiner les propriétés de plusieurs matériaux différents, en un seul matériau artificiel, en plus de permettre l’apparition d’effets de proximité aux interfaces des différentes couches. Une perspective prometteuse serait d’amener la spintronique vers les matériaux de van der Waals, profitant ainsi de leur grande diversité, de leur épaisseur atomique, ainsi que de leur robustesse mécanique. Pour plus d'informations, merci de contacter Finco A. |
Mer. 07/12/2022 09:45 Bâtiment 20, Amphi ROYALL C. Patrick (ESPCI) The Different Facets of Dynamical Arrest in Hard and Sticky Spheres: from Glasses to Gels (Matière Molle & Verres) Our understanding of the mechanism by which the viscosity of supercooled liquids increases by many orders of magnitude is often described as a major challenge in condensed matter physics [1,2]. It is therefore necessary to discriminate between seemingly incompatible theoretical approaches which provide equally good descriptions of experimental data: a scientific revolution [3]. Much of the perceived incompatibility revolves around whether the glass transition is driven by underlying thermodynamics or is predominantly a dynamical phenomenon. Here we report new results with experiments and simulations which explore previously inaccessible dynamical regimes at the single-particle level [4,5], where we test explicitly the predictions of each approach. We find that the predictions of both thermodynamic and dynamical approaches are upheld and suggest routes out of the scientific revolution of the glass transition. Pour plus d'informations, merci de contacter Finco A. |