Studies on light-scattering in emulsions Part I. Dilute simple emulsions

Abstract

Measurements of the depolarisation factors ρ_u, ρ_v and ρ_h have been made in some typical dilute simple emulsions. Two methoels have been employed for the preparation of these emulsions: (1) by boiling a mixture of water and a few drops of the oil and (2) by pouring an alcoholic solution of the oil into a large quantity of water. The valncs of ρ_v and ρ_h are of the order of 0.5 per cent and 2 per cent respectively for most of the emulsions. Depolarisation measurements indicate that the droplets in the emulsions prepared by the first method are bigger in size than those in the emulsions prepared by the second method. The depolarisation factors exhibit appreciable dispersion. It is shown that the droplets in dilute simple emulsions are spherical in shape and that the observed finite values of ρ_v and ρ_h are due to the existence of depolarised secondary scattering.