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
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2010
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.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 20887
- DOI 10.1080/15394451003708549
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301598
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