Time-Dependent Strength of Colloidal Gels
© 2005 American Physical Society. The article appeared in Physical Review Letters, Vol. 95, Iss. 4 and may be found here.
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.
S. Manley; Benny Davidovitch; Neil R. Davies; L. Cipelletti; A. E. Bailey; Rebecca J. Christianson; U. Gasser; V. Prasad; P. N. Segre; M. P. Doherty; S. Sankaran; A. L. Jankovsky; Zin Technologies, Inc.; Zin Technologies, Inc.; Zin Technologies, Inc.; Zin Technologies, Inc.; Zin Technologies, Inc.; and D. A. Weitz. "Time-Dependent Strength of Colloidal Gels" Physical Review Letters 95.4 (2005).
Available at: http://works.bepress.com/rebecca_christianson/9