Laurent Gonon
Centre national de la recherche scientifique
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Laurent Gonon.
Journal of the American Chemical Society | 2014
Daniel Lee; Guillaume Monin; Nghia Tuan Duong; Isabel Zamanillo Lopez; Michel Bardet; Vincent Mareau; Laurent Gonon; Gaël De Paëpe
Silica (SiO2) nanoparticles (NPs) were functionalized by silanization to produce a surface covered with organosiloxanes. Information about the surface coverage and the nature, if any, of organosiloxane polymerization, whether parallel or perpendicular to the surface, is highly desired. To this extent, two-dimensional homonuclear (29)Si solid-state NMR could be employed. However, owing to the sensitivity limitations associated with the low natural abundance (4.7%) of (29)Si and the difficulty and expense of isotopic labeling here, this technique would usually be deemed impracticable. Nevertheless, we show that recent developments in the field of dynamic nuclear polarization under magic angle spinning (MAS-DNP) could be used to dramatically increase the sensitivity of the NMR experiments, resulting in a timesaving factor of ∼625 compared to conventional solid-state NMR. This allowed the acquisition of previously infeasible data. Using both through-space and through-bond 2D (29)Si-(29)Si correlation experiments, it is shown that the required reaction conditions favor lateral polymerization and domain growth. Moreover, the natural abundance correlation experiments permitted the estimation of (2)J(Si-O-Si)-couplings (13.8 ± 1.4 Hz for surface silica) and interatomic distances (3.04 ± 0.08 Å for surface silica) since complications associated with many-spin systems and also sensitivity were avoided. The work detailed herein not only demonstrates the possibility of using MAS-DNP to greatly facilitate the acquisition of 2D (29)Si-(29)Si correlation spectra but also shows that this technique can be used in a routine fashion to characterize surface grafting networks and gain structural constraints, which can be related to a systems chemical and physical properties.
Materials | 2017
Iole Venditti; Laura Fontana; Francesca A. Scaramuzzo; Maria Vittoria Russo; Chiara Battocchio; Laura Carlini; Laurent Gonon; Vincent Mareau; Ilaria Fratoddi
Gold nanoparticles, capped by 3-mercapto propane sulfonate (Au-3MPS), were synthesized inside a swollen sulfonated poly(ether ether ketone) membrane (sPEEK). The formation of the Au-3MPS nanoparticles in the swollen sPEEK membrane was observed by spectroscopic and microscopic techniques. The nanocomposite containing the gold nanoparticles grown in the sPEEK membrane, showed the plasmon resonance λmax at about 520 nm, which remained stable over a testing period of three months. The size distribution of the nanoparticles was assessed, and the sPEEK membrane roughness, both before and after the synthesis of nanoparticles, was studied by AFM. The XPS measurements confirm Au-3MPS formation in the sPEEK membrane. Moreover, AFM experiments recorded in fluid allowed the production of images of the Au-3MPS@sPEEK composite in water at different pH levels, achieving a better understanding of the membrane behavior in a water environment; the dynamic hydration process of the Au-3MPS@sPEEK membrane was investigated. These preliminary results suggest that the newly developed nanocomposite membranes could be promising materials for fuel cell applications.
Journal of Power Sources | 2006
Gilles Meyer; Gérard Gebel; Laurent Gonon; Philipe Capron; Didier Marscaq; Catherine Marestin; Régis Mercier
Polymer | 2009
Carine Perrot; Laurent Gonon; Michel Bardet; Catherine Marestin; Alain Pierre-Bayle; Gérard Gebel
Polymer | 2006
Gilles Meyer; Carine Perrot; Gérard Gebel; Laurent Gonon; Sandrine Morlat; Jean-Luc Gardette
Journal of Polymer Science Part A | 2010
Julien Jouanneau; Laurent Gonon; Gérard Gebel; Vincent Martin; Régis Mercier
Physical Chemistry Chemical Physics | 2014
H. Mendil-Jakani; I. Zamanillo López; P. M. Legrand; V. H. Mareau; Laurent Gonon
Journal of Power Sources | 2010
Carine Perrot; Laurent Gonon; Catherine Marestin; Arnaud Morin; Gérard Gebel
Journal of Membrane Science | 2015
Sylvain Magana; Nicolas Festin; Matthieu Fumagalli; Linda Chikh; Fabrice Gouanvé; V.H. Mareau; Laurent Gonon; Odile Fichet; Eliane Espuche
Journal of Power Sources | 2012
P.M. Legrand; Arnaud Morin; V.H. Mareau; Laurent Gonon