Shear-induced restructuring of colloidal silica gels

E Drabarek; John R Bartlett; H J M Hanley; J L Woolfrey; C D Muzny; B D Butler

doi:10.1023/A:1008765111690

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Shear-induced restructuring of colloidal silica gels

Journal article

Peer reviewed

Shear-induced restructuring of colloidal silica gels

E Drabarek, John R Bartlett, H J M Hanley, J L Woolfrey, C D Muzny and B D Butler

Journal of Sol-Gel Science and Technology, Vol.19(1-3), pp.279-283

2000

DOI: https://doi.org/10.1023/A:1008765111690

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Abstract

Materials Engineering

silica

gel structure

shear-induced restructuring

gelation mechanism

Continuous oscillatory experiments were used to investigate the viscoelastic properties and structural evolution of silica gels obtained from unsheared and presheared sols, at pH 8. The processes controlling structural evolution before, at and after the gel point are discussed. Although the viscoelastic properties of the aged gels are comparable (implying similar structures on length scales of several microns), their chemical properties and microstructures (less than 1 μm) are significantly different. This is directly related to the different aggregate structures formed in the unsheared and presheared systems (50 and 700 nm, respectively) and the associated concentration of surface hydroxyls available for cross-linking and formation of stable siloxane bonds.

Details

Title: Shear-induced restructuring of colloidal silica gels
Authors: E Drabarek (Author) - Australian Nuclear Science and Technology Organisation Materials Division
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
H J M Hanley (Author) - Australian Nuclear Science and Technology Organisation Materials Division
J L Woolfrey (Author) - Australian Nuclear Science and Technology Organisation Materials Division
C D Muzny (Author) - National Institute of Standards and Technology, United States
B D Butler (Author) - National Institute of Standards and Technology, United States
Publication details: Journal of Sol-Gel Science and Technology, Vol.19(1-3), pp.279-283
Publisher: Springer New York LLC
Date published: 2000
DOI: 10.1023/A:1008765111690
ISSN: 0928-0707
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448709802621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Ceramics

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