IMPROVED PARTICLE-SIZE DISTRIBUTION MEASUREMENTS USING MULTIANGLE DYNAMIC LIGHT-SCATTERING

Dynamic light scattering is a widely used technique for the determinat ion of particle size in colloidal systems. However,the resolution of t he technique is limited by the inherently low information content of t he data and the nonunique nature of the data analysis. In this paper, the extra constraints provided by the simultaneous analysis of multian gle dynamic and static light scattering data are used to improve the r esolution, and reduce the run-to-run variability, of the resulting par ticle size distributions. It is shown that the multiangle approach pro vides considerably more robust particle size determinations than any s ingle angle experiment of similar total duration. In addition, the mul tiangle analysis is better able to resolve closely spaced components i n multimodal samples.