Aggregation, ageing and transport properties of surface modified fumed silica dispersions

Nordström, Jonas, Matic, Aleksandar, Sun, Jiazeng, Forsyth, Maria and MacFarlane, Douglas R. 2010, Aggregation, ageing and transport properties of surface modified fumed silica dispersions, Soft matter, vol. 6, no. 10, pp. 2293-2299.

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Title Aggregation, ageing and transport properties of surface modified fumed silica dispersions
Author(s) Nordström, Jonas
Matic, Aleksandar
Sun, Jiazeng
Forsyth, Maria
MacFarlane, Douglas R.
Journal name Soft matter
Volume number 6
Issue number 10
Start page 2293
End page 2299
Total pages 7
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2010
ISSN 1744-683X
1744-6848
Summary We have investigated the aggregation, ageing and transport properties of surface modified silica dispersions in DMSO by photon correlation spectroscopy and conductivity measurements. The surface modification introduces Li+-ions that dissociate in the dispersion creating a single Li+-ion conducting electrolyte. We show that the surface modification changes the aggregation and ageing properties of the material. There is a pronounced ageing observed for the modified silica dispersions. At high concentrations of fumed silica a gel state is found, which in the case of the surface modified silica is a very weak gel that can be rejuvenated by ultrasonic treatment. The key parameter controlling the aggregation in this system is hydrogen bonding and the surface modification results in a very low number of sites for hydrogen bonding. In addition there is a contribution from repulsive electrostatic interactions in the surface modified silica dispersions due to the highly charged surfaces of these particles. Furthermore, the Li+-ion diffusion, at low silica concentration, is three orders of magnitude faster than that of the silica particles and in the gel state the silica particles are immobile. We also find that the Li+-ion diffusion is virtually independent of the silica concentration in the dispersions.
Language eng
Field of Research 020406 Surfaces and Structural Properties of Condensed Matter
030607 Transport Properties and Non-equilibrium Processes
091205 Functional Materials
Socio Economic Objective 850401 Fuel Cells (excl. Solid Oxide)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30031045

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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