Phys. Rev. E 80, 010404(R) (2009) [4 pages]

Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel

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Ajay Singh Negi^* and Chinedum O. Osuji^†
Department of Chemical Engineering, Yale University, New Haven, Connecticut 06511, USA

Received 8 May 2009; published 29 July 2009

We monitor the relaxation of internal stresses in a fractal colloidal gel on cessation of flow and find a weak power-law decay, σ_i∼t^−α over five decades of time where α≈0.07. The system exhibits physical aging of the elastic modulus, G^′∼t^β, with β≈α. Imposition of zero stress after waiting time t_w results in strain recovery as the system relaxes without constraint. Remarkably, recoveries at different t_w can be shifted to construct a master curve where data are scaled vertically by 1/σ_i(t_w) and plotted horizontally as (t−t_w)/t_w^μ, where μ≈1.25, indicative of a superaging response.

URL:

http://link.aps.org/doi/10.1103/PhysRevE.80.010404

DOI:

10.1103/PhysRevE.80.010404

PACS:

82.70.Dd, 61.43.Hv, 82.70.Gg, 83.80.Hj

^*ajay.negi@yale.edu

^†chinedum.osuji@yale.edu

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Phys. Rev. E 80, 010404(R) (2009) [4 pages]

Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel