Modelling of artefacts in estimations of particle size of needle-like particles from laser diffraction measurements
Modelling of artefacts in estimations of particle size of needle-like particles from laser diffraction measurements
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DOI：
10.1016/j.ces.2016.10.031
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发表时间：
2017-02-02
影响因子：
4.7
通讯作者：
Sefcik, Jan
中科院分区：
文献类型：
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作者：
Agimelen, Okpeafoh S.;Mulholland, Anthony J.;Sefcik, Jan
许多行业的颗粒产品制造都依赖于对分散体或粉末中粒度分布的精确测量。激光衍射（或小角度光散射）通常用于颗粒尺寸测量，通常是离线的。通过该方法估计颗粒尺寸需要使用合适的散射模型来解决反问题，该模型考虑了颗粒的尺寸、形状和光学特性。然而，激光衍射仪器通常附带采用球形颗粒默认散射模型的软件，即使大量颗粒产品以针状等强烈非球形形状出现，该软件也可用于解决逆问题。在这项工作中，我们证明，使用球形模型来估计针状颗粒的尺寸可以导致以多峰颗粒群的形式出现伪影，其尺寸模式比样品中实际存在的颗粒小得多。这种效应可能导致平均粒径的显着低估以及估计粒径分布的错误模式。
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 off-line, 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 non-spherical shapes such as needles. In this work, we demonstrate that using the spherical model for the estimation of sizes of needle-like 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 under-estimation of the mean particle size and in false modes in estimated particles size distributions.