To properly evaluate powder particles, not only the average particle size but also the particle size distribution is important.
The size of particles as a bulk, that is, as an aggregate, is typically represented by the distribution of the presence ratio for various measurement results according to size (particle diameter). The criteria for the presence ratio can be based on volume (volume distribution), number (number distribution), etc. In microtrack (laser diffraction and scattering method), volume distribution is measured in principle. (It is easy to convert to number criteria using software, assuming the shape of the particles is spherical.) The sedimentation method is a mass-based measurement method, but since the density of the sample is required during the measurement process, volume distribution can also be obtained. In dynamic light scattering, it is common to obtain the presence ratio as the relative intensity of the signal, but in the case of nanotracks, volume distribution can be output. Particle size distribution can be represented as frequency or as a cumulative distribution. The cumulative distribution can have an oversize curve that rises to the right with fine particles set to zero, and an undersize curve that falls to the right with coarse particles set to zero. *For more details, please refer to the related links or feel free to contact us.*
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