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The effect of particle aspect ratio on spatially and angularly resolved vis-NIR spectroscopy of suspensions
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Paper Abstract

The particle characteristics in a suspension affect the performance and quality of the end product of many chemical industries. The shape of the suspended particles can be influenced by changes in the manufacturing process conditions. Thus, there is a need for a robust method for continuous monitoring of particle characteristics through the process. This study investigates the feasibility of using spatially and angularly resolved diffuse reflectance measurements as a method of determining particle shape. A forward calculation was developed using the discrete dipole approximation to estimate optical properties of the single particle and the diffuse approximation for the reflectance of the particle suspension. The method was used to study aqueous suspensions of randomly-oriented polystyrene ellipsoids. Our objectives were to determine and elucidate the contribution of aspect ratio on optical measurement in vis-NIR spectra. The results suggest that the method is suitable for determining particle shape for suspensions where the particle and the solvent have significantly different optical properties. For these systems, the study suggests that diffusion reflectance measurements can be developed into an in-line method for particle shape determination.

Paper Details

Date Published: 21 June 2019
PDF: 7 pages
Proc. SPIE 11060, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials IV, 1106019 (21 June 2019); doi: 10.1117/12.2530187
Show Author Affiliations
Daria Stoliarskaia, Univ. of Strathclyde (United Kingdom)
Kelly Thomson, Univ. of Strathclyde (United Kingdom)
Leo Lue, Univ. of Strathclyde (United Kingdom)
Yi-chieh Chen, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 11060:
Optical Methods for Inspection, Characterization, and Imaging of Biomaterials IV
Pietro Ferraro; Simonetta Grilli; Monika Ritsch-Marte; Christoph K. Hitzenberger, Editor(s)

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