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The European Physical Journal E

, Volume 14, Issue 3, pp 287–292 | Cite as

Dynamics of concentrated colloidal suspensions during drying --aging, rejuvenation and overaging

  • T. Narita
  • C. Beauvais
  • P. Hébraud
  • F. Lequeux
Article

Abstract.

We report on the slow dynamics of concentrated colloidal suspensions during drying and rewetting under conditions of reversible concentration changes without coalescence or aggregation. We used multispeckle diffusing-wave spectroscopy to monitor the slow dynamics of particles. We found that the \(\alpha\) relaxation of the suspensions exhibits successively slowing-down, acceleration and a stationary regime during drying at constant rates. Under rewetting conditions, we observed slowing-down and a stationary regime. The characteristic time of the stationary regime is inversely proportional to the rate of concentration change and identical for both drying and rewetting. We explain these regimes as aging (overaging), rejuvenation and plastic flow of the suspensions induced by a deviatoric stress (a combination of compressive and elongational stresses) which is induced by the uniaxial compressive strain generated by evaporation.

Keywords

Spectroscopy Evaporation Characteristic Time Stationary Regime Plastic Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  • T. Narita
    • 1
  • C. Beauvais
    • 1
  • P. Hébraud
    • 1
  • F. Lequeux
    • 1
  1. 1.Laboratoire de Physico-chimie MacromoléculaireCNRS UMR7615, ESPCIParis cedex 05France

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