Volume 75, Number 5, September 2006
|Page(s)||764 - 770|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||02 August 2006|
Glassy dynamics and aging in a dense ferrofluid
European Synchrotron Radiation Facility - 6 rue Jules Horowitz BP 220, F-38043 Grenoble Cedex 9, France
2 Laboratoire Liquides Ioniques et Interfaces Chargées, UMR 7612, Université Paris VI CNRS, ESPCI - 4 place Jussieu, 75252 Paris Cedex 05, France
Accepted: 17 July 2006
X-ray Photon Correlation Spectroscopy is used here to probe for the first time a glass-forming dispersion of repulsive particles spherical and sized. The highly concentrated colloidal system is based on the magnetic and charge-stabilized nanoparticles of a ferrofluid. Their out-of-equilibrium translational dynamics capture on nanoscale generic features usually observed on microscale: namely i) stretched exponential α relaxation with an exponent around 1.5 and ii) age-dependent characteristic time τ evolving from exponential at young ages to a slower behavior at large ages. τ is here scaling as in the whole experimental Q-range, below, on and above the scale of the interparticle distance, the driving force for aging in this glass-forming nanosystem being associated to larger scale rearrangements.
PACS: 61.10.-i – X-ray diffraction and scattering / 82.70.Dd – Colloids / 64.70.Pf – Glass transitions
© EDP Sciences, 2006
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