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Differential dynamic microscopy for anisotropic colloidal dynamics.

Authors
  • Reufer, Mathias1
  • Martinez, Vincent A
  • Schurtenberger, Peter
  • Poon, Wilson C K
  • 1 SUPA and School of Physics Astronomy, The University of Edinburgh, Edinburgh, United Kingdom. [email protected] , (United Kingdom)
Type
Published Article
Journal
Langmuir
Publisher
American Chemical Society
Publication Date
Mar 13, 2012
Volume
28
Issue
10
Pages
4618–4624
Identifiers
DOI: 10.1021/la204904a
PMID: 22324390
Source
Medline
License
Unknown

Abstract

Differential dynamic microscopy (DDM) is a low-cost, high-throughput technique recently developed for characterizing the isotropic diffusion of spherical colloids using white-light optical microscopy. (1) We develop the theory for applying DDM to probe the dynamics of anisotropic colloidal samples such as various ordered phases, or particles interacting with an external field. The q-dependent dynamics can be measured in any direction in the image plane. We demonstrate the method on a dilute aqueous dispersion of anisotropic magnetic particles (hematite) aligned in a magnetic field. The measured diffusion coefficients parallel and perpendicular to the field direction are in good agreement with theoretical values. We show how these measurements allow us to extract the orientational order parameter S(2) of the system.

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