1,721,283 research outputs found
Editorial of the Special Issue dedicated to the AIZ Workshop 2006 on “Innovative Applications of Layered Materials, from Catalysts to Nanotechnology”
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Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles
No full textThe interaction of water molecules with the surface of hybrid silica-based mesoporous materials is studied by 29Si, 1H and 13C solid-state NMR and IR spectroscopy, with the support of ab initio calculations. The surface of aminopropyl-grafted mesoporous silica nanoparticles is studied in the dehydrated state and upon interaction with controlled doses of water vapour. Former investigations described the interactions between aminopropyl and residual SiOH groups; the present study shows the presence of hydrogen-bonded species (SiOH to NH2) and weakly interacting “free” aminopropyl chains with restricted mobility, together with a small amount of protonated NH3 + groups. The concentration of the last-named species increased upon interaction with water, and this indicates reversible and fast proton exchange from water molecules to a fraction of the amino groups. Herein, this is discussed and explained for the first time, by a combination of experimental and theoretical approaches. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinhei
Molecular Probes for the Characterisation of Adsorption Sites in Micro- and Mesoporous Materials
No full textStructural and Morphological Modifications of Sintering microcrystalline TiO2: XRD, HRTEM and FTIR study
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