Adsorption of Sodium Dodecyl Sulfate at Water–Dodecane Interface in Relation to the Oil in Water Emulsion Properties

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Abstract
The control of the behavior of oil in water emulsions requires deepen investigations on the adsorption properties of the emulsion stabilizers at interfaces, being these fundamental to explain the (de)stabilization mechanisms. In this work, we present an extensive study on oil-in-water emulsions stabilized by Sodium Dodecyl Sulfate (SDS) below its critical micellar concentration. Dynamic tensiometry, dilational rheology and electrical conductivity measurements are used to investigate the adsorption properties at the droplet interface, while the ageing of the respective emulsions was investigated by monitoring the macroscopic thickness of the emulsion layer, by micro-imaging and Dynamic Light Scattering (DLS) analysis, to get information on the drop size distribution. In addition, the droplet coalescence is investigated by a microscopy set-up. The results of this multi-techniques study allow deriving a coherent scenario where the adsorption properties of this ionic surfactant relate to those of the emulsion, such as for example, the prevention of droplet coalescence and the presence of other mechanisms, such as Ostwald ripening, responsible of the emulsion ageing.
Funding Information
  • European Space Agency
  • Agenzia Spaziale Italiana (2013-028-R.O)

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