Written by: Ulf Nobbmann. The term polydispersity (or more recently dispersity without the poly, as per IUPAC recommendation) is used to describe the degree of ânon-uniformityâ of a distribution. In the field of molecular/nanoparticular characterization there are in principle two different definitions of polydispersity, depending on the underlying property of interest. In Gel Permeation Chromatography (GPC) and Size Exclusion Chromatography (SEC) we are interested in the molecular weight of the sample.
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