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Supported heterogeneous catalysts: what controls cobalt nanoparticle dispersion on alumina?

Citation

Loedolff, MJ and Goh, B-M and Koutsantonis, GA and Fuller, RO, Supported heterogeneous catalysts: what controls cobalt nanoparticle dispersion on alumina?, New Journal of Chemistry, 42, (18) pp. 14894-14900. ISSN 1144-0546 (2018) [Refereed Article]

Copyright Statement

The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2018

DOI: doi:10.1039/c8nj03076f

Abstract

We investigate how a number of physical parameters control the rate and pattern of nanoparticle assemblage onto a commercially available alumina surface. 8 nm ε-Co nanoparticles supported on polycrystalline alumina are found to have areas of both good dispersion and areas of aggregation. A similar pattern of dispersion was also observed for larger (∼30 nm) polycrystalline ferromagnetic ε-Co nanoparticles. Acid and base treatment of the amphoteric support material prior to the assemblage process is found to have little impact on dispersion of the particles. Using a nonpolar solvent for the assemblage process eliminates the effect of zeta potential and allows for rapid attachment of particles to the support. Performing the assemblage in a polar solvent is found to significantly decrease the rate of the particle attachment to the support. Despite the slower attachment of particles, there is no impact on the nanoparticle distribution pattern. In contrast to the mixed dispersion observed when assembling nanoparticles on an alumina support, ε-Co nanoparticles are found to disperse uniformly across an ordered mesoporous MCM-41 silica support. It seems likely that a specific chemical interaction between the support surface and nanoparticle are dictating the assemblage process.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Macromolecular and Materials Chemistry
Research Field:Nanochemistry and Supramolecular Chemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
UTAS Author:Fuller, RO (Dr Rebecca Fuller)
ID Code:135517
Year Published:2018
Deposited By:Chemistry
Deposited On:2019-10-28
Last Modified:2019-12-09
Downloads:0

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