Abstract
This is the third installment in a series of our papers on the use of the longitudinal surface wave technique to study the dynamic properties of surfactant solutions at fluid—fluid interfaces. Our new method utilizes a capillary wave propagating orthogonally to a longitudinal wave to probe an oscillating interfacial tension. In this paper, we demonstrate how our experimental apparatus assembled for dilational viscoelastic measurements at gas—liquid surfaces can be adapted to the measurements of dilational properties at liquid—liquid interfaces. We present data on the Gibbs elasticity, the diffusion parameter and the interfacial excess viscosities for the system decane versus aqueous solution of sodium dodecyl sulfate to illustrate the performance of our apparatus. The limitations of this apparatus and the inherent problems associated with the longitudinal wave technique are discussed.
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