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Univ. Paris-Saclay
28 novembre 2022
H. P. Khanh Ngo, E. Planes, C. Iojoiu, P. Soudant, A.-L. Rollet, P. Judeinstein The increasing need of portable electrical resources requires to develop post-Li batteries, in which redox reactions are then based on the different alkali or earth alkaline ions.
14 novembre 2022
Molécules clés du vivant, les polymères d'acides nucléiques peuvent se présenter sous la forme d'une chaine moléculaire unique ou sous une forme multichaines (tel que la double hélice de l'ADN), qui adoptent une grande variété de conformations, pouvant comprendre des hélices simples ou doubles, des boucles, des pseudo-nœuds des structures en duplexes, triplexes ou quadruplexes.
07 novembre 2022
Michal Swierczewski, Alexis Chenneviere, Lay-Theng Lee, Plinio Maroni, Thomas Bürgi Langmuir-Blodgett (LB) technique allows the deposition of gold nanoclusters (atomically precise nanoparticles below 2 nm in diameter) onto solid substrates with an unprecedented degree of control and high transfer ratios. Nanoclusters are expected to follow the crinkle folding mechanism, which promotes the formation of trilayers but kinetically disfavors the formation of the fourth layer.
02 septembre 2022
Simeon Minić, Burkhard Annighöfer, Arnaud Hélary, Laïla Sago, David Cornu, Annie Brûlet, Sophie Combet High pressure (HP) is a particularly powerful tool to study protein folding/unfolding, revealing subtle structural rearrangements. Bovine β-lactoglobulin (BLG), a protein of interest in food science, exhibits a strong propensity to bind various bioactive molecules.
24 août 2022
Le rôle régulateur de la protéine Hfq, protéine bactérienne notamment trouvée chez Escherichia coli, est attribué principalement à sa fonction d'ARN-chaperon, facilitant les interactions entre ARNs. La protéine est aussi impliquée dans la structuration et la compaction de l’ADN.
22 juillet 2022
Fabrizia Foglia, Quentin Berrod, Adam J. Clancy, Keenan Smith, Gérard Gebel, Victoria García Sakai, Markus Appel, Jean-Marc Zanotti, Madhusudan Tyagi, Najet Mahmoudi, Thomas S. Miller, John R. Varcoe, Arun Prakash Periasamy, Daniel J. L. Brett, Paul R. Shearing, Sandrine Lyonnard and Paul F.
01 juillet 2022
Tiago Outerelo Corvo, Antoine Jourdain, Shona O’Brien, Frédéric Restagno, Eric Drockenmuller, and Alexis Chennevière Poly(ionic liquid)s (PILs), similar to their ionic liquid (IL) analogues, present a nanostructure arising from local interactions.
02 juin 2022
Marion Grzelka, Iurii Antoniuk, Éric Drockenmuller, Alexis Chennevière, Liliane Léger, and Frédéric Restagno The role of the polymer volume fraction, ϕ, on steady-state slippage and interfacial friction is investigated for semi-dilute polystyrene solutions in diethyl phthalate in contact with two solid surfaces. Significant slippage is evidenced for all samples, with slip lengths b obeying a power law dependence.
11 mai 2022
Du fait même de sa structure moléculaire, l'eau présente un très grand nombre d’anomalies physico-chimiques par rapport à un liquide ordinaire avec un diagramme de phases complexe.
21 avril 2022
Sumit Mehan, Laure Herrmann, Jean-Paul Chapel, Jacques Jestin, Jean-Francois Berret and Fabrice Cousin We investigate the formation/re-dissociation mechanisms of hybrid complexes made from negatively charged PAA2k coated g-Fe2O3 nanoparticles (NP) and positively charged polycations (PDADMAC) in aqueous solution in the regime of very high ionic strength (I).
23 mars 2022
Christiane Alba-Simionesco , Patrick Judeinstein , Stéphane Longeville, Oriana Osta , Florence Porcher , Frédéric Caupin , and Gilles Tarjus The proneness of water to crystallize is a major obstacle to understanding its putative exotic behavior in the supercooled state. It also represents a strong practical limitation to cryopreservation of biological systems.
22 février 2022
J.C.Riedl, M.Sarkar, T.Fiuza, F.Cousin, J.Depeyrot, E.Dubois,G.Mériguet,R.Perzynski and V.Peyre Some of the most promising fields of application of ionic liquid-based colloids imply elevated temperatures. Their careful design and analysis is therefore essential. We assume that tuning the structure of the nanoparticle-ionic liquid interface through its composition can ensure colloidal stability for a wide temperature range, from room temperature up to 200 °C. https://doi.org/10.
15 décembre 2021
Virginie Vergnat, Benoît Heinrich, Michel Rawiso, René Muller, Geneviève Pourroy and Patrick Masson Embedding nanoparticles (NPs) with organic shells is a way to control their aggregation behavior. Using polymers allows reaching relatively high shell thicknesses but suffers from the difficulty of obtaining regular hybrid objects at gram scale.
29 novembre 2021
Les nanoparticules offrent de nouvelles propriétés spécifiquement liées à leur taille. Parmi-celles-ci, une bonne efficacité catalytique est attendue du fait de leur très grande surface spécifique.
02 novembre 2021
Michal Swierczewski, Plinio Maroni, Alexis Chenneviere, Mohammad M. Dadras, Lay-Theng Lee, Thomas Bürgi Nanoscale particles attract much attention due to their size-dependent optical, electrical and chemical properties. Of particular interest are ultrasmall metal nanoclusters which experience strong quantum confinement effect leading to profound changes in the atomic packing structure.
10 octobre 2021
J. Wolanin, L. Michel, D. Tabacchioni, J. M. Zanotti, J. Peters, I. Imaz, B. Coasne, M. Plazanet, and C. Picard With their strong confining porosity and versatile surface chemistry, zeolitic imidazolate frameworks—including the prototypical ZIF-8—display exceptional properties for various applications. In particular, the forced intrusion of water at high pressure (∼25 MPa) into ZIF-8 nanopores is of interest for energy storage.
18 septembre 2021
T. Fiuza, M. Sarkar, J. C. Riedl, A. Cebers, F. Cousin, G. Demouchy, J. Depeyrot, E. Dubois, F. Gelebart, G. Meriguet, R. Perzynski and V. Peyre Ferrofluids based on maghemite nanoparticles (NPs), typically 10 nm in diameter, are dispersed in an ionic liquid (1-ethyl 3-methylimidazolium bistriflimide – EMIM-TFSI). The average interparticle interaction is found to be repulsive by small angle scattering of X-rays and of neutrons, with a second virial coefficient A2 = 7.3.
27 août 2021
Eni Kume and Laurence Noirez In the conventional picture, the temperature of a liquid bath in the quiescent state is uniform down to thermal fluctuation length scales. Here we examine the impact of a low-frequency shear mechanical field (hertz) on the thermal equilibrium of polypropylene glycol and liquid water away from any phase transition confined between high-energy surfaces.
12 avril 2021
Julie Wolanin, Jérôme Giraud, Claude Payre, Marianne Benoit, Claire Antonelli, Damien Quemener, Iliass Tahiri, Matthieu Vandamme, Jean-Marc Zanotti, and Marie Plazanet, Review of Scientific Instruments 92 (2021) 024106 In comparison to condensed matter, soft matter is subject to several interplaying effects (surface heterogeneities and swelling effect) that influence transport at the nanoscale.
05 avril 2021
Au laboratoire Léon Brillouin, et pour le monde de la diffusion de neutrons, ce mois de mars 2021 a été marqué par un évènement important : la 1ère mise sous faisceau de neutrons de l‘instrument SHARP*, nouveau spectromètre de neutrons à temps de vol, auprès du réacteur européen de l'Institut Laue Langevin (ILL) de Grenoble.
26 février 2021
La structure des protéines est en lien étroit avec leur fonction. Ainsi, sonder les états de repliement et d'oligomérisation des protéines est un défi majeur en biologie.
26 janvier 2021
La "corona" désigne l'enveloppe de protéines qui entoure spontanément toute nanoparticule plongée dans un milieu biologique. Elle joue un rôle important dans les mécanismes couramment en jeu en nanomédecine et nanotoxicologie.
23 décembre 2020
Liu Chang; Hu Wenxian; Jiang Hanqiu; Liu Guoming; Han Charles; Sirringhaus Henning; Boué François; Wang Dujin The determination of intrinsic chain stiffness of conjugated polymers is challenging, in particular, for scattering techniques because of their strong light absorption and structural instability due to the complicated intra-/intermolecular interactions.
02 décembre 2020
Simeon Minic, Burkhard Annighofer, Arnaud Helary, Djemel Hamdane, Gaston Hui Bon Hoa, Camille Loupiac, Annie Brulet, and Sophie Combet To probe intermediate states during unfolding and oligomerization of proteins remains a major challenge. High pressure (HP) is a powerful tool for studying these problems, revealing subtle structural changes in proteins not accessible by other means of denaturation.
10 novembre 2020
Chang Liu, Wenxian Hu, Hanqiu Jiang, Guoming Liu*, Charles C. Han, Henning Sirringhaus, François Boué, and Dujin Wang The determination of intrinsic chain stiffness of conjugated polymers is challenging, in particular, for scattering techniques because of their strong light absorption and structural instability due to the complicated intra-/intermolecular interactions.
20 octobre 2020
K. Beauvois, V. Simonet, S. Petit, J. Robert, F. Bourdarot, M. Gospodinov, A.A. Mukhin, R. Ballou, V. Skumryev, and E. Ressouche The research field of magnetic frustration is dominated by triangle-based lattices but exotic phenomena can also be observed in pentagonal networks. A peculiar noncollinear magnetic order is indeed known to be stabilized in Bi2Fe4O9 materializing a Cairo pentagonal lattice.
28 septembre 2020
Li Shi, Florent Carn, Arsen Goukassov, Eric Buhler, and François Boué Mixing negatively charged polyelectrolyte (PEL) with positively charged gold nanoparticles (Au NPs) in aqueous solution results in electrostatics complexes of different shapes and compactness. Here, when complexing with a semirigid PEL hyaluronic acid (HA), we obtain crystals made of nanoparticles in a new region of the phase diagram, as evidenced by small-angle Xray scattering (SAXS).
02 septembre 2020
Marine Le Goas, Tom Roussel, Maria Kalbazova, David Carrière, Elodie Barruet, Valerie Geertsen, Giulia C. Fadda, Fabienne Testard, Geraldine Carrot and Jean-Philippe Renault Nanomedicines are considered as promising therapeutics for cancer treatment. However, clinical translation is still scarce, partly because their biological behavior is not well understood.
18 août 2020
Le transport des biomolécules joue un rôle essentiel dans les mécanismes biologiques du vivant. Ce rôle reste cependant encore mal compris, en partie du fait du manque d'informations quantitatives.
23 juin 2020
We show by X-ray and neutron small-angle scattering that gold nanoparticles with controlled sizes and morphologies can be obtained by the metallic reduction of AuCl4– ions trapped in 3D organic molds by X-ray radiolysis. The molds are spherical frozen micelles of polystyrene-b-poly(dimethylaminoethyl methacrylate) (PS-b-PDMAEMA) block copolymer in acidic aqueous solution with a PS spherical core surrounded by a corona of PDMAEMA chains in good solvent.

 

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