Determination of Interfacial Area in Unstable Emulsions by Light Transmission

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Abstract
Total interfacial area can be determined in agitated mixtures of transparent immiscible liquids by calculation from photoelectric measurements of their light transmission relative to clear fluids, with a probe of new design which is inserted into the emulsion. The probe is compact and rugged, and can be assembled from a simply constructed housing together with commercially available parts. A calibration obtained by high-speed photography of the emulsions is presented. The drop diameters measured were in the range of 0.01 to 0.10 cm, and, in this range, the specific area is found to depend only upon the light transmission and the ratio of refractive indexes of the dispersed and continuous phases.