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Differential Dynamic Microscopy for Anisotropic Colloidal Dynamics

Reufer, Mathias; Martinez, Vincent A.; Schurtenberger, Peter LU and Poon, Wilson C. K. (2012) In Langmuir 28(10). p.4618-4624
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
28
issue
10
pages
4618 - 4624
publisher
The American Chemical Society
external identifiers
  • wos:000301397100005
  • scopus:84858237692
ISSN
0743-7463
DOI
10.1021/la204904a
language
English
LU publication?
yes
id
4fb11f6d-bae7-47f3-83a2-7cbace90a099 (old id 2591140)
date added to LUP
2012-05-30 14:43:58
date last changed
2017-10-22 03:31:51
@article{4fb11f6d-bae7-47f3-83a2-7cbace90a099,
  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.},
  author       = {Reufer, Mathias and Martinez, Vincent A. and Schurtenberger, Peter and Poon, Wilson C. K.},
  issn         = {0743-7463},
  language     = {eng},
  number       = {10},
  pages        = {4618--4624},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Differential Dynamic Microscopy for Anisotropic Colloidal Dynamics},
  url          = {http://dx.doi.org/10.1021/la204904a},
  volume       = {28},
  year         = {2012},
}