Optics and Photonics Society of Iran

Abstract- Dynamic light scattering (DLS) is one of the most powerful methods for determining size of nano-spheres. One of the advantages of this method is determining size distribution of particles. The method of cumulants is a standard technique used to analyze dynamic light scattering data measured for polydisperse samples. These data, from the intensity autocorrelation function of the scattered light, can be describe in terms of a distribution of decay rates and also as size distribution of particles. The method is reformulated in terms of the moments about the mean to permit more satisfactory fits. In this paper the mean size and size distribution of samples in different sizes have been investigated