Abstract
Manufacturing of particulate products across many industries relies on accurate measurements of particle size distributions in dispersions or powders. Laser diffraction (or small angle light scattering) is commonly used, usually offline, for particle size measurements. The estimation of particle sizes by this method requires the solution of an inverse problem using a suitable scattering model that takes into account size, shape and optical properties of the particles. However, laser diffraction instruments are usually accompanied by software that employs a default scattering model for spherical particles, which is then used to solve the inverse problem even though a significant number of particulate products occur in strongly nonspherical shapes such as needles. In this work, we demonstrate that using the spherical model for the estimation of sizes of needlelike particles can lead to the appearance of artefacts in the form of multimodal populations of particles with size modes much smaller than those actually present in the sample.
This effect can result in a significant underestimation of the mean particle size and in false modes in estimated particles size distributions.
This effect can result in a significant underestimation of the mean particle size and in false modes in estimated particles size distributions.
Original language  English 

Journal  Chemical Engineering Science 
Publication status  Published  2 Feb 2017 
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Professor Anthony Mulholland
 Department of Engineering Mathematics  Professor/Head of Department
Person: Academic