Phys. Rev. Lett. 85, 4819–4822 (2000)

Rheological Aging and Rejuvenation in Microgel Pastes

Abstract

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Michel Cloitre^*, Régis Borrega^†, and Ludwik Leibler
Laboratoire CNRS-ATOFINA, 95, rue Danton, 92303 Levallois-Perret, France

Received 3 April 2000; published in the issue dated 27 November 2000

See accompanying Physics Focus

We have studied experimentally the rheological behavior of concentrated suspensions of soft deformable microgels below the yield point. We have found history-dependent effects which are interpreted in terms of aging and rejuvenation phenomena, analogous to those existing in glassy systems. The stress amplitude controls the long-time memory and determines the slow evolution of the suspensions.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.85.4819

DOI:

10.1103/PhysRevLett.85.4819

PACS:

83.70.Hq, 61.20.Lc, 62.20.Fe

^*Corresponding author.Email address: michel.cloitre@levl.elf-atochem.fr

^†Present address: Spontex, Recherche et Développement, 74, rue de Saint-Just-des-Marais, 60026 Beauvais Cedex, France.

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Phys. Rev. Lett. 85, 4819–4822 (2000)

Rheological Aging and Rejuvenation in Microgel Pastes