The equilibrium bipolar charge distribution of aerosols has been measured using monodisperse DOP (di-octyl phthalate) particles of 0.53, 0.55, and 1.17 μm diameter. The measured charge distributions are in good agreement with the Gaussian distributions predicted by Boltzmann's law. Additionally, the ratio of charged and uncharged particles was measured using monodisperse NaCl and methylene blue particles between 0.02 and 0.2 μm diameter. The result was compared with the theories of Bricard, Fuchs, and Natanson as well as with continuum and free molecular theories and values predicted by Boltzmann's law. Best agreement is again obtained for Boltzmann's law. The results indicate that the existing combination rate expressions for ions and particle are not sufficiently exact to account for the experimental results obtained here.
Bibliographical noteFunding Information:
This research was supported by the Atomic Energy Commission under Contract AT (11-1)-1248. The paper carries the contract publication number CO0-1248-43.