Meso-organisation of SiO2 and TiO2 particles prepared by spray drying have been for the first time analysed through in-situ SAXS. Both processing and chemical parameters are critical to obtain meso-organised spheres.
Lysine, poly-lysine and lysozyme were successfully intercalated in the MnPS 3 layered phases. Intercalates were characterised by elemental and thermogravimetric analysis, and X-ray powder diffraction. Biomolecules conformation between the layers appears to result from the optimisation of the host-guest interactions. Moreover, infrared spectroscopy and differential scanning calorimetry measurements suggest that lysozyme is not denatured by the intercalation process.
The reaction of vanadate(V) with a series of dipeptides (Val-Gln, Ala-Gln, Gly-Gln, Gly-Glu, and Ala-Gly) was investigated by UV-visible spectroscopy and multinuclear ((51)V, (14)N, (13)C) NMR spectroscopy in solution. It was possible to evaluate the formation constants of the corresponding complexes for which a molecular structure was proposed. Complex formation is favored by the presence of a functionalized or a sterically demanding side chain. The Val-Gln dipeptide which combines both properties exhibits one of the highest formation constant reported so far for dipeptides.
Résumé -Matériaux aluminosilicates innovants à porosité hiérarchisée obtenus par voie aérosol -Cet article met en évidence le fort potentiel d'un procédé d'atomisation (ou procédé aérosol) pour obtenir de nouvelles familles de solides aluminosilicates présentant une porosité hiérarchisée dans la gamme de la micro à la macroporosité. Il est ainsi possible d'obtenir, en une seule étape de synthèse, et grâce à un procédé fonctionnant en continu, des aluminosilicates mésostructurés à forte teneur en aluminium, des solides composites constitués de nanocristaux de zéolithe piégés dans une matrice mésostructurée et des aluminosilicates micro, méso et macroporeux présentant des propriétés catalytiques en craquage du cumène inédites. Ces résultats prometteurs ouvrent des perspectives intéressantes pour le développement de nouveaux supports acides pour des catalyseurs d'hydrocraquage.
Abstract -New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process
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