Particle Charging of Transition Region of About One Micron in Ion Field

Abstract

Experiments on the particle charging in an electric and ion field were carried out with DOP particles around one micron in radius. An empirical particle charge equation is derived from them.
According to the results of our experiments, the classical field charging theory (hereafter field charging theory) is applicable even to particles about one micron in radius and to a low electric field strength by making a few modifications of it. The modifications are to enlarge the particle size by about 0.2μm and to enhance the applied electric field strength by about 0.4kV/cm. A new and simple charging equation is derived by making the modifications of the field charging equation.