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Differential Dynamic Microscopy: Probing Wave Vector Dependent Dynamics with a Microscope

Roberto Cerbino and Veronique Trappe
Phys. Rev. Lett. 100, 188102 – Published 5 May 2008
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Abstract

We demonstrate the use of an ordinary white-light microscope for the study of the q-dependent dynamics of colloidal dispersions. Time series of digital video images are acquired in bright field with a fast camera, and image differences are Fourier analyzed as a function of the time delay between them. This allows for the characterization of the particle dynamics independent of whether or not they can be resolved individually. The characteristic times are measured in a wide range of wave vectors and the results are found to be in good agreement with the theoretically expected values for Brownian motion in a viscous medium.

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  • Received 6 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.188102

©2008 American Physical Society

Authors & Affiliations

Roberto Cerbino1,2,* and Veronique Trappe1

  • 1Department of Physics, University of Fribourg, Chemin du Musée 3, CH-1700, Fribourg, Switzerland
  • 2Department of Chemistry, Biochemistry and Medical Biotechnologies, Universitá degli Studi di Milano, I-20133 Milano, Italy

  • *roberto.cerbino@unimi.it

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Issue

Vol. 100, Iss. 18 — 9 May 2008

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