### Abstract

This effect can result in a significant under-estimation of the mean particle size and in false modes in estimated particles size distributions.

Language | English |
---|---|

Pages | 445-452 |

Number of pages | 8 |

Journal | Chemical Engineering Science |

Volume | 158 |

Early online date | 18 Oct 2016 |

DOIs | |

Publication status | Published - 2 Feb 2017 |

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### Keywords

- particle size distribution
- particle shape
- particle sizing
- light scattering
- laser diffraction
- non-spherical particles
- needle-like particles
- spherical model
- particle size estimation

### Cite this

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**Modelling of artefacts in estimations of particle size of needle-like particles from laser diffraction measurements.** / Agimelen, Okpeafoh S.; Mulholland, Anthony J.; Sefcik, Jan.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Modelling of artefacts in estimations of particle size of needle-like particles from laser diffraction measurements

AU - Agimelen, Okpeafoh S.

AU - Mulholland, Anthony J.

AU - Sefcik, Jan

PY - 2017/2/2

Y1 - 2017/2/2

N2 - 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.

AB - 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.

KW - particle size distribution

KW - particle shape

KW - particle sizing

KW - light scattering

KW - laser diffraction

KW - non-spherical particles

KW - needle-like particles

KW - spherical model

KW - particle size estimation

U2 - 10.1016/j.ces.2016.10.031

DO - 10.1016/j.ces.2016.10.031

M3 - Article

VL - 158

SP - 445

EP - 452

JO - Chemical Engineering Science

T2 - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -