Hydrodynamic signatures of stationary Marangoni-driven surfactant transport Phys. Rev. Lett. 119, 264501 (2017) PDF
by Bandi, Akella, Singh, Singh and MandreFluid Mechanics Surfactants
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 a priori unknown, we demonstrate this method’s efficacy by showing its spreading is adsorption dominated.