Journal article

Monitoring spatially heterogeneous dynamics in a drying colloidal thin film

  • Zakharov, Pavel Department of Physics, University of Fribourg, Switzerland
  • Scheffold, Frank Department of Physics, University of Fribourg, Switzerland - Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Published in:
  • Soft Materials. - 2010, vol. 8, no. 2, p. 102-113
English We report on a new type of experiment that enables us to monitor spatially and temporally heterogeneous dynamic properties in complex fluids. Our approach is based on the analysis of near-field speckles produced by light diffusely reflected from the superficial volume of a strongly scattering medium. By periodic modulation of an incident speckle beam we obtain pixel-wise ensemble averages of the structure function coefficient, a measure of the dynamic activity. To illustrate the application of our approach we follow the different stages in the drying process of a colloidal thin film. We show that we can access ensemble averaged dynamic properties on length scales as small as ten micrometers over the full field of view.
Faculté des sciences et de médecine
Département de Physique
  • English
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