ABSTRACT
The particle shape is an important parameter influencing the behavior of a particle. The properties of dispersions depend on physical properties of the dispersed particles: the size, shape, density, and the surface. In dispersions formed by emulsion polymerization the particles are spherical and discrete. Hence each particle may be defined as a discrete small quantity of mass surrounded by a liquid medium. The term particle size implies that a dispersed particle can be described by a quantity that defines the dimensions of the particle. The particle size in dispersions containing various sizes of particles cannot be adequately described with one parameter or one mean particle diameter; the particle size distribution has to be given. The simplest procedure for evaluating the particle size of powders is sieving. Hydrodynamic chromatography determines particle size by Chromatographie techniques using an apparatus similar to a conventional chromatograph. Osmometry has been employed to determine particle sizes and measure interparticle forces.
