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Time-dependent strength of colloidal gels |
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| Authors: | Manley S Davidovitch Benny Davies Neil R Cipelletti L Bailey A E Christianson R J Gasser U Prasad V Segre P N Doherty M P Sankaran S Jankovsky A L Shiley B Bowen J Eggers J Kurta C Lorik T Weitz D A |
| Affiliation: | Department of Physics & DEAS, Harvard University, Cambridge, Massachusetts 02138, USA. |
| Abstract: | 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. |
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