Abstract
A polynomial approximation model (PAM) of correlogram was presented to improve a data reduction of photon correlation spectroscopy (PCS), and was applied to a particle sizing of aerosols. Diameters of submicron aerosol and alcosol particles were obtained for several sizes of polystyrene latex (PSL) particles by the PCS with two correlation models ; the one is the PAM and the other is a usual correlation model (UCM) on self-diffusion of particle. The particle size determined by UCM was consistent with nominal diameter for alcosols, however, the reduced size of aerosols showed twice or more in diameter by UCM. The diameter determined using PAM was in good agreement with that obtained by electron-microscopy even in aerosols. The method was also applied to an in-situ measurement of particle growth by thin film coating of Methy1-2-Cyano-Acrylate vapor on 497 nm PSL aerosol particles, and a growth rate of 3 × 10-11 m/s was obtained at 40°C.
