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Phys. Rev. Lett. 95, 048302 (2005) [4 pages]

Time-Dependent Strength of Colloidal Gels

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S. Manley1, Benny Davidovitch2, Neil R. Davies1, L. Cipelletti1,*, A. E. Bailey1,†, R. J. Christianson1, U. Gasser1,‡, V. Prasad1,§, P. N. Segre1,**, M. P. Doherty3, S. Sankaran3, A. L. Jankovsky3, B. Shiley4, J. Bowen4, J. Eggers4, C. Kurta4, T. Lorik4, and D. A. Weitz1
1Department of Physics & DEAS, Harvard University, Cambridge, Massachusetts 02138, USA
2DEAS, Harvard University, Cambridge, Massachusetts 022138, USA
3NASA Glenn Research Center, Brook Park, Ohio 44135, USA
4Zin Technologies, Inc., Brook Park, Ohio 44142, USA

Received 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

*Present address: GDPC cc 26, Universite Montpellier II, P. E. Bataillon, Montpellier 34000, France.

Present address: Scitech Instruments, Inc., North Vancouver, BC, Canada V7J 2S5.

Present address: Dept. of Physics, University of Konstanz, Konstanz, Germany.

§Present address: Dept. of Chemical Engineering, UCSB, Santa Barbara, CA 93106, USA.

**Present address: NASA Marshall SpaceFlight Center, Huntsville, AL 35812, USA.