Do I always get unimodal distribution for granules particle size after wet or dry granulation? How about after milling? I am using laser diffraction method, volume distribution vs particle size.
You can assume, that the distribution is unimodal in case of granulationg on kind of powder. After mixing several powders the distribution can differ due to the behavior of the various components. Some of them, dependant for example on particle shape, may behave different. An important factor in this cas is not only the shape, but also the different quantities of the components within the mixture.
The shape of the particle size distribution curve is mainly related to the heterogeneity of the analyzed particles. When the sample has particles of similar sizes, you will see a unimode curve; however, if there is a greater population variation of the particles, this could produce a multimodal curve.
You can see bimodal curves in figure 4 of this article:
https://www.researchgate.net/publication/337495685_EFEITO_DA_NATUREZA_DOS_CORPOS_MOEDORES_NO_PRODUTO_DA_MOAGEM_DE_CALCARIO_EM_MOINHO_PLANETARIO_DE_BOLAS
Although the article is in Portuguese, you will see this type of curve.
I hope this helps!
Yen Fong Ho Open circuit unit operation of a single material tends to produce a unimodal lognormal distribution (which looks symmetrical if displayed on a log x size horizontal scale). Closed circuit unit operation (the norm) tends to produce a truncated/cut log normal with the sharper cut at the top end of the distribution if the large size is recycled in the classifier.
Multiple peaks often result from inadequate equilibration time on milling - Clyde Orr hows some plots in his classic text 'Particulate Technology' from 1966.
Or mixtures (after separate open or closed circuit unit operation), of course.
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