Abstract
THE purpose of this letter is to propose a primary standard for the absolute measurement of particle size and shape1,2. Primary standards should be obtained by direct measurement with visual microscopy, but without automatic equipment these methods require prohibitive effort. In practice, therefore, secondary methods (such as sieving, sedimentation, permeability, adsorption, scattering and Coulter counting) are used3, and the results reflect the combined effects of size and shape. Practical limitations on the primary method can now be overcome with the computerized scanning microscope. A method has been developed based on these techniques which defines size/shape uniquely.
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References
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CHENG, DH., SUTTON, H. Absolute Determination of Particle Size and Shape. Nature Physical Science 232, 192–193 (1971). https://doi.org/10.1038/physci232192a0
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DOI: https://doi.org/10.1038/physci232192a0
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