Colloid stability of synthetic titania and the influence of surface roughness

The colloid stability of synthetic titania particles was studied as a function of KCl concentration at pH values of 6.3, 6.7, and 8.4, using static light scattering to obtain stability ratios. Standard DLVO theory was then used to calculate the stability ratios as a function of salt concentration. R...

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Bibliographic Details
Published in:Journal of colloid and interface science 2005-06, Vol.286 (2), p.526-535
Main Authors: Snoswell, David R.E., Duan, Jinming, Fornasiero, Daniel, Ralston, John
Format: Article
Language:English
Subjects:
Chemistry
Colloid stability
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Surface roughness
Titania
Zeta potential
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Summary:The colloid stability of synthetic titania particles was studied as a function of KCl concentration at pH values of 6.3, 6.7, and 8.4, using static light scattering to obtain stability ratios. Standard DLVO theory was then used to calculate the stability ratios as a function of salt concentration. Reasonable agreement between theory and experiment could only be obtained if an effective interaction radius, corresponding to surface asperities on the titania particles, was used in the calculation. High-resolution TEM images suggest that the effective interaction radius corresponds to the size of surface crystallites formed during synthesis.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2005.01.056