Abstract
We experimentally study steady Marangoni-driven surfactant transport on the interface of a deep water layer. Using hydrodynamic measurements, and without using any knowledge of the surfactant physicochemical properties, we show that sodium dodecyl sulphate and Tergitol 15-S-9 introduced in low concentrations result in a flow driven by adsorbed surfactant. At higher surfactant concentration, the flow is dominated by the dissolved surfactant. Using camphoric acid, whose properties are apriori unknown, we demonstrate this method's efficacy by showing its spreading is adsorption dominated.
Highlights
Surfactants introduced at liquid interfaces give rise to Marangoni stresses that drive a flow [1]
Without using any knowledge of the surfactant physicochemical properties, we show that sodium dodecyl sulphate and Tergitol 15-S-9 introduced in low concentrations result in a flow driven by adsorbed surfactant
Simple scaling laws for surfactant spreading were derived by assuming the sorption kinetics to be much faster than the hydrodynamics, so that the dynamics were dominated by the dissolved phase
Summary
Surfactants introduced at liquid interfaces give rise to Marangoni stresses that drive a flow [1]. We experimentally study steady Marangoni-driven surfactant transport on the interface of a deep water layer. Without using any knowledge of the surfactant physicochemical properties, we show that sodium dodecyl sulphate and Tergitol 15-S-9 introduced in low concentrations result in a flow driven by adsorbed surfactant.
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