Journal
LANGMUIR
Volume 28, Issue 10, Pages 4618-4624Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la204904a
Keywords
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Funding
- Swiss National Science Foundation [PBFRP2-127867, 200021_127192]
- EPSRC [EP/E030173/1, EP/D071070/1]
- FP7-PEOPLE [PIIF-GA-2010-276190]
- EPSRC [EP/J007404/1, EP/D071070/1, EP/E030173/1] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [PBFRP2-127867, 200021_127192] Funding Source: Swiss National Science Foundation (SNF)
- Engineering and Physical Sciences Research Council [EP/J007404/1, EP/E030173/1, EP/D071070/1] Funding Source: researchfish
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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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