Accession Number : AD0625540

Title :   DETERMINATION OF PARTICLE SIZE DISTRIBUTIONS IN EMULSIONS BY LIGHT SCATTERING.

Descriptive Note : Technical rept. (doctoral thesis),

Corporate Author : WAYNE STATE UNIV DETROIT MICH DEPT OF CHEMISTRY

Personal Author(s) : Greene,Bettye W.

Report Date : 15 NOV 1965

Pagination or Media Count : 138

Abstract : The light scattering method for determining size distributions in liquid dispersoids was found applicable to the spontaneous dimethylnaphthalene emulsions which contained sub-micronic particulates and were approximately 30% more heterodisperse than the synthetic heterodispersions of 'monodisperse' latices used to verify the method experimentally. A bi-parametric, exponential, positively-skewed distribution function closely approximating the distribution law commonly obeyed by emulsions was assumed. The effect of stabilizer concentration, and the effect of aging on the size distribution of emulsions, was systematically investigated. Two scattering spectra, the turbidity and the scattering ratio as a function of wavelength, were obtained. Although the turbidity or transmission measurements are, in general, simpler and more accurate than those of scattering ratio, the turbidity spectra was found too insensitive to give an independent, unambiguous estimate of sizes in these moderately heterodisperse systems. Electronic comparison and fitting of the experimental with the theoretical scattering spectra corresponding to various distribution parameters were accomplished with the IBM 7070 computer. (Author)

Descriptors :   (*PARTICLE SIZE, COLLOIDS), (*COLLOIDS, PARTICLE SIZE), LIGHT, SCATTERING, DISTRIBUTION FUNCTIONS, POLYCYCLIC COMPOUNDS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE