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Size distribution of a metallic polydispersion through capacitive measurements in a sedimentation experiment

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6 Author(s)
Salazar-Neumann, E. ; Departamento de Fı´sica Aplicada, CINVESTAV-IPN, Unidad Mérida, A. P. 73 “Cordemex,” Mérida, Yucatán 97310, México ; Nahmad-Molinari, Y. ; Ruiz-Suarez, J.C. ; Ardisson, P.-L.
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We present a simple experimental technique to determine size distributions of metallic polydispersions. The particles are first suspended in a viscous fluid-like glycerol and then their sedimentation is followed by measuring the effective dielectric constant in a cylindrical cell at a fixed frequency. Thereafter, an inversion procedure of the data, based on the Maxwell–Garnett effective medium theory and Stokes law, is used to directly obtain the size distribution. The technique is applied to three different stainless steel dispersions and compares very well with a traditional sizing method based in microphotography. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:79 ,  Issue: 3 )