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Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope

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 on whether they can be resolved individually or not. The characteristic times are measured in a wide range of wavevectors and the results are found to be in good agreement with the theoretically expected values for Brownian motion in a viscous medium.

preprint2015arXivOpen access
Roberto CerbinoVeronique Trappe
cond-mat.softphysics.optics
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Roberto CerbinoVeronique Trappe

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