Time-dependent strength of colloidal gels

Colloidal silica gels are shown to stiffen with time, as demonstrated by both dynamic light scattering and bulk rheological measurements. Their elastic moduli increase as a power law with time, independent of particle volume fraction; however, static light scattering indicates that there are no large-scale structural changes. We propose that increases in local elasticity arising from bonding between neighboring colloidal particles can account for the strengthening of the network, while preserving network structure. © 2005 The American Physical Society.


Published in:
Physical Review Letters, 95, 4, 048302
Year:
2005
ISSN:
0031-9007
Laboratories:




 Record created 2012-11-26, last modified 2018-09-13

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