Print Email Facebook Twitter The role of the hydrogen bond in dense nanoparticle–gas suspensions Title The role of the hydrogen bond in dense nanoparticle–gas suspensions Author Tahmasebpoor, M. Mart?n, L. De Talebi, M. Mostoufia, N. Van Ommen, R.J. Faculty Applied Sciences Department DelftChemTech Date 2013-02-19 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. Subject Gold for GoldOpen Access To reference this document use: http://resolver.tudelft.nl/uuid:3a85800f-6bf1-498c-95d1-ac46f4b7e09f DOI https://doi.org/10.1039/c3cp43687j Publisher RSC Publishing ISSN 1463-9076 Source Physical Chemistry Chemical Physics, 2013, 15 Part of collection Institutional Repository Document type journal article Rights (c) 2013 RSC Files PDF C3CP43687J.pdf 1.46 MB Close viewer /islandora/object/uuid:3a85800f-6bf1-498c-95d1-ac46f4b7e09f/datastream/OBJ/view