The hydrodynamic radius of the particles present in a colloidal solution can be determined by dynamic scattering of light. (Dynamic light scattering).
The samples (in aqueous or non-aqueous solution) are irradiated by a laser light (632,8 nm). The equipment records the intensity of the light scattered by the particles present. The diameter distribution (assuming a spherical particle) It is modeled by using the equipment's own algorithm. It is possible to describe up to three populations of different size (from 1 nm a 5000 nm). The required sample volume is 300 microliters. This is a non-destructive technique.
We have two different teams to make these determinations:
NICOMP-Particle Sizing Sytems
For shifts and information contact: Soledad Bazán (sbazan@unc.edu.ar).