Abstract
A nonspherical particle has the projected area, averaged over all orientations, greater than that of a sphere with equal volume. Such a particle may thus appear greater to a projected-area-sensitive optical counter than to a volume-sensitive resistive counter. Typical well-crystallized kaolinite particles with a volume equal to that of a 10-μm sphere were sized using an optical Hiac counter as about 1.2 times greater than using a resistive Coulter counter. This caused a significant difference between the size distributions of the kaolinite particles determined using the two counters. A relationship between the size distributions obtained using the two counters is presented and applied to characterize the shape of the kaolinite particles. The characteristics of the particle shape agree with the data obtained using a scanning electron microscope.
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