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Jan 2012

Volume 83, Issue 1, Articles (01xxxx)

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Rev. Sci. Instrum. 83, 011301 (2012); http://dx.doi.org/10.1063/1.3674173 (12 pages)

Joshua A. Dijksman, Frank Rietz, Kinga A. Lőrincz, Martin van Hecke, and Wolfgang Losert

In a dense, submersed packing of particles (left), a thin laser sheet and a fluorescent dye make the packing structure visible (right, laser light overlaid).  This simple principle allows for a detailed study of structure and flow behavior of dense granular materials. Image created by Felice Frankel and JAD.

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Invited Article: Refractive index matched scanning of dense granular materials

Joshua A. Dijksman, Frank Rietz, Kinga A. Lőrincz, Martin van Hecke, and Wolfgang Losert

Rev. Sci. Instrum. 83, 011301 (2012); http://dx.doi.org/10.1063/1.3674173 (12 pages) | Cited 4 times

Online Publication Date: 24 January 2012

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We review an experimental method that allows to probe the time-dependent structure of fully three-dimensional densely packed granular materials and suspensions by means of particle recognition. The method relies on submersing a granular medium in a refractive index matched fluid. This makes the resulting suspension transparent. The granular medium is then visualized by exciting, layer by layer, the fluorescent dye in the fluid phase. We collect references and unreported experimental know-how to provide a solid background for future development of the technique, both for new and experienced users.
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78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
82.70.Kj Emulsions and suspensions
78.55.Bq Liquids
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