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Journal Articles Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Year : 2001

Diffusing-wave spectroscopy of nonergodic media

F. Scheffold
  • Function : Author
S. Romer
  • Function : Author
P. Schurtenberger
  • Function : Author

Abstract

We introduce an elegant method which allows the application of diffusing-wave spectroscopy (DWS) to nonergodic, solid-like samples. The method is based on the idea that light transmitted through a sandwich of two turbid cells can be considered ergodic even though only the second cell is ergodic. If absorption and/or leakage of light take place at the interface between the cells, we establish a so-called "multiplication rule", which relates the intensity autocorrelation function of light transmitted through the double-cell sandwich to the autocorrelation functions of individual cells by a simple multiplication. To test the proposed method, we perform a series of DWS experiments using colloidal gels as model nonergodic media. Our experimental data are consistent with the theoretical predictions, allowing quantitative characterization of nonergodic media and demonstrating the validity of the proposed technique.

Dates and versions

hal-00373424 , version 1 (05-04-2009)

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Cite

F. Scheffold, S. E. Skipetrov, S. Romer, P. Schurtenberger. Diffusing-wave spectroscopy of nonergodic media. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2001, 63, pp.061404. ⟨10.1103/PhysRevE.63.061404⟩. ⟨hal-00373424⟩

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