NUMBER DENSITY OF PARTICLES IN MONODISPERSE IN SOLUTION, AND METHOD FOR CALCULATING FRACTIONATED DIFFERENTIAL NUMBER DISTRIBUTION FOR SUSPENSION IN PARTICLE OF POLYDISPERSE
PROBLEM TO BE SOLVED: To provide a method for calculating the absolute number density of particles in solution, based on a light scattering method. SOLUTION: By calibrating a light scattering photometer, the Rayleigh ratio at each measured angle is achieved for a light that is scattered per unit incidence intensity, which is per unit volume irradiated with light within the visual field of each detector per steradian for the detector. The particles irradiated with the light needs to be essentially monodisperse so that the calculated number becomes accurate. The effective particle diameter is calculated from a transmission Rayleigh ratio measured at a plurality of angles for incident light beams applied to the sample particles, and is used for calculating the differential scattered intensity at each angle. Then, the measured excess Rayleigh ratio is divided by the corresponding differential scattered intensity, to calculate the number of particles per unit volume element. COPYRIGHT: (C)2005,JPO&NCIPI
