Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

Geo Paul, Giorgia Elena Musso, Emanuela Bottinelli, Maurizio Cossi, Leonardo Marchese, Gloria Berlier

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The 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.

Lingua originaleInglese
pagine (da-a)839-849
Numero di pagine11
RivistaChemPhysChem
Volume18
Numero di pubblicazione7
DOI
Stato di pubblicazionePubblicato - 5 apr 2017

Fingerprint

Entra nei temi di ricerca di 'Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles'. Insieme formano una fingerprint unica.

Cita questo