Phys. Rev. Lett. 95, 048302 (2005) [4 pages]Time-Dependent Strength of Colloidal GelsReceived 27 July 2004; published 22 July 2005 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 URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.048302
DOI:
10.1103/PhysRevLett.95.048302
PACS:
82.70.Gg, 61.43.Hv, 62.20.Dc, 82.70.Dd
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