Monitoring spatially heterogeneous dynamics in a drying colloidal thin film

Details Monitoring spatially heterogeneous dynamics in a drying colloidal thin film Monitoring spatially heterogeneous dynamics in a drying colloidal thin film

2007-04-05

arxiv.org/abs/0704.0681v2

Physics

Condensed Matter

Soft Condensed Matter

To appear in Soft Materials

Scientific paper

10.1080/15394451003708549

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.

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