Single-particle statistics derived from light-blockage instruments

This study examines the distribution of measured diameters of single particles. Diameter distributions of six particles were compared with the theoretical gamma, chisquared, and Student's t distributions. Five aluminum oxide particles of varying shape, and a nitrocellulose spheroid were each re...

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Bibliographic Details
Published in:Powder technology 1989-02, Vol.57 (2), p.143-149
Main Authors: Butler, A.A., Butler, P.B., Luerkens, D.W.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Miscellaneous
Solid-solid systems
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Summary:This study examines the distribution of measured diameters of single particles. Diameter distributions of six particles were compared with the theoretical gamma, chisquared, and Student's t distributions. Five aluminum oxide particles of varying shape, and a nitrocellulose spheroid were each repeatedly sized thirty-two times using a light-blockage particle counter. For each observation, an equivalent diameter was calculated from the projected cross-sectional area of the particle. Mean diameters and standard deviations were then calculated from these values. A qualitative description of each particle's shape was determined using a scanning electron microscope. The shapes ranged from spheroidal to flake-like. Using the Student t distribution and specified confidence levels, an estimate was also made of the minimum number of trials necessary to reproduce the experimental results.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(89)80018-X