Issue 16, 2013

The role of the hydrogen bond in dense nanoparticle–gas suspensions

Abstract

The effect of surface characteristics on the interaction between nanoparticles and their agglomeration in dense gas suspensions is still not fully understood. It is known that when the surface is covered with hydroxyl groups, the interaction between nanoparticles becomes substantially stronger than in the absence of these groups; this strengthening is typically attributed to the formation of capillary bridges between the particles. However, this work shows that part of the increase of the interaction is due to the direct hydrogen bonds formed between the surfaces of the polar particles. Dry nitrogen was used to fluidize polar (hydrophilic) and apolar (hydrophobic) SiO2, TiO2 and Al2O3 particles, with a size ranging from 13 to 21 nm. The dry polar particles showed smaller bed expansion and larger minimum fluidization velocity compared to their apolar counterparts, indicating stronger interparticle forces. The results show the importance of including the formation of hydrogen bonds in the modeling of the interaction between dry and polar nanoparticles.

Graphical abstract: The role of the hydrogen bond in dense nanoparticle–gas suspensions

Article information

Article type
Paper
Submitted
18 okt 2012
Accepted
19 fev 2013
First published
19 fev 2013
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2013,15, 5788-5793

The role of the hydrogen bond in dense nanoparticle–gas suspensions

M. Tahmasebpoor, L. de Martín, M. Talebi, N. Mostoufi and J. R. van Ommen, Phys. Chem. Chem. Phys., 2013, 15, 5788 DOI: 10.1039/C3CP43687J

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