• Thèse

Emergence de biopolymères de complexite contrôlée dans les scénarios d'origine de la vie, Emergence of biopolymers with controlled complexity in an origins of life scenario

Lise Bedoin

La matière vivante se caractérise par la présence de biopolymères non aléatoires dont la fonction biologique dépend de la séquence en monomères. Pour comprendre les origines de la vie, il est essentiel d’expliquer l’émergence de polymères non aléatoires dans un monde où les cellules vivantes n…, Living matter is characterized by the presence of non-random biopolymers whose biological function depends on the monomer sequence. Thus, a major challenge for the elucidation of the Origins of Life lies in understanding how non-random polypeptides were formed and selected among all of the possible…

Polymères. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS229⟩. ⟨tel-03475214⟩

• Article dans une revue

Structure–Activity Relationship in Manganese Perovskite Oxide Nanocrystals from Molten Salts for Efficient Oxygen Reduction Reaction Electrocatalysis

Francisco Gonell, Carlos M Sánchez-Sánchez, Vincent Vivier, Christophe Méthivier, Christel Laberty-Robert, David Portehault

We report a synthesis pathway in molten salts toward ligand-free nanoparticles of the layered perovskite La0.5Sr1.5MnO4 (l-LSMO) and of the pseudocubic perovskite La0.7Sr0.3MnO3 (pc-LSMO). These particles are readily implemented as oxygen reduction reaction (ORR) electrocatalysts in alkaline…

Chemistry of Materials, 2020, 32 (10), pp.4241-4247. ⟨10.1021/acs.chemmater.0c00681⟩. ⟨hal-02767098⟩

• Article dans une revue

Supramolecular Self‐Assembly and Organization of Collagen at Solid/Liquid Interface: Effect of Spheroid‐ and Rod‐Shaped TiO 2 Nanocrystals

Mathieu Beauvais, Thomas Degabriel, Nesrine Aissaoui, Vincent Dupres, Elodie Colaço, Karim El Kirat, Rute F Domingos, Dalil Brouri, Claire‐marie Pradier, Jolanda Spadavecchia, Jessem Landoulsi

The adsorption behavior of collagen on solid surfaces is a process that determines the role of this protein to mediate cell–material interaction. Herein, the mechanism of self‐assembly and organization of collagen on a model substrate is investigated in the presence of TiO2 nanoparticles. In…

Advanced Materials Interfaces, 2019, 6 (14), pp.1900195. ⟨10.1002/admi.201900195⟩. ⟨hal-02391527⟩

• Article dans une revue

Microwave frequency behavior of the EPR copper(II) ion pairs spectrum formed in the CuCe oxide

Antoine Aboukais, Abdelrhani Bennani, Cossi Faustin Aissi, Michel Guelton, Jacques C. Vedrine

Chemistry of Materials, 1992, 4, pp.977-979. ⟨10.1021/cm00023a008⟩. ⟨hal-00006212⟩

• Thèse

Prebiotic Organization of Biomolecules on Mineral Surfaces, Organisation prébiotique de biomolécules sur des surfaces minérales

Hagop Abadian

This thesis reports on the adsorption of two amino acids (AA) with different properties, Leucine and Glutamic acid, on the amorphous silica surface. It exemplifies a general approach to hybrid systems that combines experimental information and molecular modeling in order to characterize at the…, Cette thèse porte sur l'adsorption de deux acides aminés aux propriétés différentes, la leucine et l'acide glutamique, sur la surface de la silice amorphe. Une combinaison d'informations expérimentales et de modélisation moléculaire a été entreprise afin de caractériser au niveau…

Material chemistry. Sorbonne Université, 2021. English. ⟨NNT : 2021SORUS035⟩. ⟨tel-03419620⟩

• Article dans une revue

Biomineralization Patterns of Intracellular Carbonatogenesis in Cyanobacteria: Molecular Hypotheses

Jinhua Li, Isabel Margaret-Oliver, Nithavong Cam, Thomas Boudier, Marine Blondeau, Eric Leroy, Julie Cosmidis, Feriel Skouri-Panet, Jean-Michel Guigner, Céline Férard, Melanie Poinsot, David Moreira, Purificacion Lopez-Garcia, Corinne Cassier-Chauvat, Franck Chauvat, Karim Benzerara

The recent discovery of intracellular carbonatogenesis in several cyanobacteria species has challenged the traditional view that this process was extracellular and not controlled. However, a detailed analysis of the size distribution, chemical composition and 3-D-arrangement of carbonates in these…

Minerals, 2016, 6 (1), pp.10. ⟨10.3390/min6010010⟩. ⟨hal-01310553⟩

• Article dans une revue

Influence of the nature of the reducible support on CO oxidation kinetics of supported Rhd+ catalysts: SnO2 versus Ce0.68Zr0.32O2

Céline Fontaine-Gautrelet, Cyril Thomas, Gérald Djéga-Mariadassou

CO-O2 kinetics was studied on Rh(0.3wt%)/SnO2 and compared with that reported previously on Rh/Ce0.68Zr0.32O2. The lower oxygen mobility on SnO2 and the stronger bonding of CO with the RhΔ+ sites of Rh/SnO2, are suggested to account for the lower CO oxidation activity of Rh/SnO2 compared with that…

Topics in Catalysis, 2007, 42-43, pp.363-366. ⟨10.1007/s11244-007-0206-y⟩. ⟨hal-00157011⟩

• Article dans une revue

A Study of Cobalt Speciation in Co/Al2O3 Catalysts Prepared from Solutions of Cobalt-Ethylenediamine Complexes

François Dumond, Eric Marceau, Michel Che

The thermal reduction of Co/Al2O3 catalysts prepared by impregnation of Co(II) nitrate generally leads to migration of cobalt ions into alumina with formation of cobalt aluminate. In order to prevent the latter, it is attempted to reduce cobalt by decomposition of supported precursor salts…

Journal of Physical Chemistry C, 2007, 111 (12), pp.4780-4789. ⟨10.1021/jp067781w⟩. ⟨hal-00143721⟩

• Article dans une revue

From Al2O3-supported Ni(II)-ethylenediamine Complexes to CO Hydrogenation Catalysts: Importance of the Hydrogen Post-treatment Evidenced by XPS

Fabien Négrier, Eric Marceau, Michel Che, Jean-Marc Giraudon, Léon Gengembre, Axel Löfberg

Ni (7 wt%)/Al2O3 catalysts prepared by decomposition of Ni(II)-ethylenediamine complexes in inert atmosphere initially contain a mixture of metallic and oxidized nickel. X-ray photoelectron spectroscopy shows that after a hydrogen treatment at 500°C, the system contains more metallic nickel than…

Catalysis Letters, 2008, 124, pp.18..23. ⟨10.1007/s10562-008-9514-5⟩. ⟨hal-00308479⟩

• Article dans une revue

Ab initio study of the hydroxylated surface of amorphous silica : a representative model.

Frederik Tielens, Christel Gervais, Jean François Lambert, Francesco Mauri, Dominique Costa

A new complete, representative model for the hydroxylated surface of amorphous silica is presented and characterized by means of periodic DFT calculations. This model accounts for the experimentally encountered ring size distribution, Si-O-Si and O-Si-O angles, silanols density, and distribution…

Chemistry of Materials, 2008, 20 (10), pp.3336-3344. ⟨10.1021/cm8001173⟩. ⟨hal-00347955⟩