• Article dans une revue

Pulsed field gradient NMR studies of n-hexane diffusion in MCM-41 materials

Ziad Adem, Flavien Guenneau, Marie-Anne Springuel-Huet, Juliette Blanchard, Antoine Gedeon

The knowledge of transport properties in heterogeneous catalysis is of important interest since the selectivity and the activity depend significantly on diffusion. Pulsed Field Gradient (PFG) NMR has proved to be a valuable tool to probe the intracrystalline diffusion of molecules adsorbed in…

Studies in Surface Science and Catalysis, 2006, XX, pp.XXX. ⟨hal-00112009⟩

• Article dans une revue

Influence of Dealumination by Acetylacetone on Acidity and Activity of Amorphous Silica-Aluminas

Xiaojing Jin, Yannick Millot, Céline Sayag, Juliette Blanchard, Pascal Ping Man

The influence of dealumination of two commercial amorphous silica-aluminas (ASAs) with acetylacetone on their textural properties, acidity and catalytic activity was studied by N2-sorption, NH3-TPD, FTIR of adsorbed pyridine as well as 1 H and 27 Al MAS NMR. Acetylacetone treatment increases the…

ChemistrySelect, 2020, 5 (8), pp.2489-2495. ⟨10.1002/slct.201904712⟩. ⟨hal-02919070⟩

• Communication dans un congrès

Nanocastings" : silices nanoporeuses SBA en tant que moules pour obtenir des nano-objets (particules-fils) d'oxydes des métaux de transition

Marianne Imperor-Clerc, Dominique Bazin, Vincent Dupuis, Regine Perzynski, Virginie Escax, Anne Davidson

Colloque nanohybrides2 (GDR 2486), Jun 2005, Autrans, France. ⟨hal-00172347⟩

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Selectivities in Adsorption and Peptidic Condensation in the (Arginine and Glutamic Acid)/Montmorillonite Clay System

Maguy Jaber, Thomas Georgelin, Houssein Bazzi, France Costa-Torro, Jean-François Lambert, Gérard Bolbach, Gilles Clodic

The present study examines the selective adsorption and polymerization of two amino acids, glutamic acid (Glu) and arginine (Arg), on a cationic clay mineral, montmorillonite (Mt). Two experimental procedures were used: selective adsorption and wet impregnation. In the first case, an adsorption…

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 2014, 118 (44), pp.25447-25455. ⟨10.1021/jp507335e⟩. ⟨hal-01121644⟩

• Article dans une revue

Chromium-Salophen as a Soluble or Silica-Supported Co-Catalyst for the Fixation of CO2 Onto Styrene Oxide at Low Temperatures

Matthieu Balas, Ludivine K/bidi, Franck Launay, Richard Villanneau

Addition of a soluble or a supported Cr III-salophen complex as a co-catalyst greatly enhances the catalytic activity of Bu 4 NBr for the formation of styrene carbonate from styrene epoxide and CO 2. Their combination with a very low co-catalyst:Bu 4 NBr:styrene oxide molar ratio 1:2:112 (…

Frontiers in Chemistry, 2021, 9 (765108), ⟨10.3389/fchem.2021.765108⟩. ⟨hal-03443129⟩

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Photocatalytic Easy Recovery of Orthophosphates Contaminants in Water Using Amberlite‐732 Cationic‐Resin Exchanged by Ce 3+ and Ce 3+ ‐Au 3+ Species

Phds. Nawel Rahmoune, Siham Barama, Anne Davidson, David Montero, Mohamed Selmane, Antoine Miche, Fouad Benaliouche, Akila Barama

This report discusses the efficiency of photo-recovery of orthophosphate anions in water under visible irradiation using materials containing amorphous carbon, ceria and gold-ceria species. Catalysts were obtained by the exchange of Amberlite-732 polymeric-resin with isolated Ce(III) and co-mixing…

ChemistrySelect, 2022, 7 (13), ⟨10.1002/slct.202104577⟩. ⟨hal-04030648⟩

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Inelastic light scattering by long narrow gold nanocrystals: when size, shape, crystallinity and assembly matter

Hervé Portalès, Nicolas Goubet, Sandra Casale, Xiang Zhen Xu, Mostapha Ariane, Alain Mermet, Jeremie Margueritat, Lucien Saviot

We report the synthesis of long narrow gold nanocrystals and the study of their vibrational dynamics using inelastic light scattering measurements. Rich experimental spectra are obtained for monodomain gold nanorods and pentagonal twinned bipyramids. Their assignment involves diameter-dependent non…

ACS Nano, 2020, 14 (4), pp.4395-4404. ⟨10.1021/acsnano.9b09993⟩. ⟨hal-02566470⟩

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Versatile Molten Salt Synthesis of Manganite Perovskite Oxide Nanocrystals and Their Magnetic Properties

Francisco Gonell, Naoual Alem, Peter Dunne, Guillaume Crochet,   Patricia Beaunier, Christophe Méthivier, David Montero, Christel Laberty, Bernard Doudin, David Portehault

Manganite perovskite oxides exhibit a wide range of properties relevant for catalysis, energy conversion and spintronics. Such behaviors can be deeply modified at the nanoscale where confinement and surface effects may prevail. Interesting properties could then emerge from manganite perovskite…

ChemNanoMat, 2019, 5 (3), pp.358-363. ⟨10.1002/cnma.201800632⟩. ⟨hal-02168943⟩

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Stability and degradation of PEO₂₀PPO₇₀PEO₂₀ triblock copolymers in mesostructured silica

Brindusa Dragoi, Guillaume Laurent, Sandra Casale, Taissire Benamor, Bénédicte Lebeau, Cédric Boissière, François Ribot, Mohamed Selmane, Patrick Schmidt, David Kreher, Anne Davidson

Organic−inorganic hybrid mesostructured silicas are prepared, without stirring (at pH = 0.0) and with stirring (at pH = 0.6) to obtain isolated and gyroidal-like attached silica grains with incorporated triblock P123 poly (ethylene oxide)-poly (propylene oxide)–poly (ethylene oxide) copolymers.…

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Polyol-mediated syntheses of crystalline nanosized manganese oxides

Guiqiang Diao, François Chau, Jean-Yves Piquemal, Emmanuel Briot, Souad Ammar, Mickaël Sicard, Sophie Nowak, Patricia Beaunier, Hélène Lecoq, P. Decorse, Lin Yu

Potassium-type birnessite and lithium-containing manganese oxides were prepared by the polyol process. The Mn(III)/Mn(IV) mixed-valencies compounds are obtained through the controlled reduction of potassium permanganate in a basic water–diethylene glycol mixture at moderate temperature and very…

Journal of Nanoparticle Research, 2014, 16 (6), pp.2428. ⟨10.1007/s11051-014-2428-9⟩. ⟨hal-01117188⟩