Abstract
The interfacial tension between n-decane and water was determined by laser light scattering. The experimentally measured autocorrelation functions were in good agreement with those derived from the hydrodynamical theory of capillary waves. For comparison, the interfacial tension was measured with the Wilhelmy plate, the du Nou¨y ring, and the spinning drop methods. The laser light-scattering technique showed the same absolute accuracy as the other methods and, within a common uncertainty of 1.5%, the same value for the interfacial tension was found. The important advantages of the laser technique in being nonperturbative and only relying on bulk phase parameters for the analysis are strong arguments for its use in measuring liquid/liquid interfacial tension.
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