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Time-dependent strength of colloidal gels

Manley, Suliana  
•
Davidovitch, B.
•
Davies, N. R.
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2005
Physical Review Letters

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.

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