Abstract
To determine the diameter of spherical monodisperse PSL (polystyrene latex) particles, the following accurate and simple methods have been examined ; 1) simplified Millikan's method, 2) gravitational sedimentation method, and 3) electrical mobility method. Among these methods, it was found that the first one was very useful for particles having diameters around 1 μm and the third one which had been well calibrated by the Millikan's method was useful for smaller particles. Although the standard deviation of particle size distribution could not be determined in this study, the methods to determine mode and arithmetic mean diameters will be useful for calibration of size analyzers including electron microscopies.
