Characterisation of colloidal silica particles with respect to size and shape by means of viscosity and dynamic light scattering measurements

A simple method has been developed to determine the axial ratios and solvation volume of small colloidal silica particles characterised as equivalent ellipsoids of revolution with the same hydrodynamic properties as the actual particles. The method is based on a combination of viscometry and dynamic...

Full description

Saved in:
Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 1996-11, Vol.118 (1), p.89-95
Main Authors: Biddle, Derek, Walldal, Charlotte, Wall, Staffan
Format: Article
Language:English
Subjects:
Characterisation
Chemistry
Colloidal silica particles
Colloidal state and disperse state
Dynamic light scattering
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A simple method has been developed to determine the axial ratios and solvation volume of small colloidal silica particles characterised as equivalent ellipsoids of revolution with the same hydrodynamic properties as the actual particles. The method is based on a combination of viscometry and dynamic light scattering and uses the relations of Simha and Perrin for the specific viscosity and frictional factors respectively of ellipsoids of revolution. The axes of the unsolvated equivalent ellipsoid and the solvation volume can be determined by knowing or assuming the thickness of the solvation shell. Silica particles form elongated aggregates and the method is applied to particles having three different degrees of aggregation.
ISSN:0927-7757
1873-4359
DOI:10.1016/0927-7757(96)03732-6