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Rotational dynamics and aging in a magnetic colloidal glass

E. Wandersman*, V. Dupuis, E. Dubois, and R. Perzynski†

  • Laboratoire PECSA, UPMC-CNRS-ESPCI, UMR 7195, 4 Place Jussieu, Case 51, 75252 Paris Cedex 05, France

  • *Present address: Kamerlingh Onnes Lab, Universiteit Leiden, Postbus 9504, 2300RA Leiden, The Netherlands.
  • †regine.perzynski@upmc.fr
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Phys. Rev. E 80, 041504 – Published 21 October, 2009

DOI: https://doi.org/10.1103/PhysRevE.80.041504

Abstract

We follow here the freezing of the orientational degrees of freedom of strongly interacting magnetic and charged nanoparticles, as the colloidal glass transition is approached. Using a magnetoinduced birefringence technique, we show that the rotational dynamics drastically slows down following a Vogel-Fulcher law. More precisely, this slowing down occurs above a volume fraction threshold ϕ∗, the value of which depends on the range of electrostatic repulsion between nanoparticles. An interpretation in terms of effective spheres, slightly anisotropic, is proposed. The aging of the rotational dynamics of the more concentrated samples is reported on long time scales, with an exponential growth of the rotational characteristic time with the age tw of the sample. An attempt of age rescaling at different volume fractions leads us to introduce a ϕ-dependent “birth age” tw0(ϕ), which diverges analytically at the Vogel-Fulcher volume fraction.

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Phys. Rev. E 80, 041504– Published 21 October, 2009
  • Received 5 March 2009

© 2009 American Physical Society

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