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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 1 — Jan. 1, 2010
  • pp: 86–98

Experimental study of nonequilibrium fluctuations during free diffusion in nanocolloids using microscopic techniques

Ana Oprisan, Sorinel Oprisan, and Alem Teklu  »View Author Affiliations

Applied Optics, Vol. 49, Issue 1, pp. 86-98 (2010)

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We report quantitative experimental results regarding concentration fluctuations based on a small-angle light-scattering setup. A shadowgraph technique was used to record concentration fluctuations in a free-diffusion cell filled with colloids. Our experimental setup includes an objective attached to the CCD camera to increase the field of view. We performed two separate experiments, one with 20 nm gold and the other with 200 nm silica colloids, and extracted both the structure factors and the correlation time during the early stages of concentration fluctuations. The temporal evolution of fluctuations was also qualitatively investigated using recursive plots and spatial-temporal sections of fluctuating images. We found that the correlation time versus wavenumber for gold nanocolloids is concave shaped, whereas, for silica colloids, it is convex shaped. The difference in correlation time behavior is not only due to the size of the particle, but also to possible plasmonic interactions in gold colloids.

© 2010 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.2960) Image processing : Image analysis
(110.2960) Imaging systems : Image analysis
(290.1990) Scattering : Diffusion
(110.4155) Imaging systems : Multiframe image processing

ToC Category:
Image Processing

Original Manuscript: August 5, 2009
Manuscript Accepted: November 13, 2009
Published: December 21, 2009

Ana Oprisan, Sorinel Oprisan, and Alem Teklu, "Experimental study of nonequilibrium fluctuations during free diffusion in nanocolloids using microscopic techniques," Appl. Opt. 49, 86-98 (2010)

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