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Sizing Polydisperse Dispersions by Focused Beam Reflectance and Small Angle Static Light Scattering
Authors:Lyonel Ehrl  Miroslav Soos  Massimo Morbidelli
Abstract:In this work, two different methods for particle characterization, namely focused beam reflectance and small angle static light scattering, are quantitatively compared. The results are presented in the form of moment ratios of the particle size distribution, i.e., the number weighted diameter, D1/0, and the volume weighted diameter, D4/3, for a broad range of particle size distributions ranging from 20 to 400 μm. Various aqueous dispersions including narrow, broad, and bimodal particle size distributions of spherical shaped ceramic beads were used in the comparison. It was found that the moment ratios obtained by focused beam reflectance measurements and small angle static light scattering correlate well, in the case of spherical particles. Furthermore, it was found that the D1/0 values obtained by focused beam reflectance measurements are more sensitive to the presence of a small fraction of fine particles in a bimodal distribution than those obtained by small angle static light scattering.
Keywords:chord length distribution (CLD)  focused beam reflectance measurement (FBRM)  laser backscattering  particle size distribution (PSD)  small angle static light scattering (SASLS)
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