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Related Experiment Videos

Detergency and Its Implications for Oil Emulsion Sieving and Separation.

Thomas M Schutzius1, Christopher Walker1, Tanmoy Maitra1

  • 1Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich , Sonneggstrasse 3, CH-8092 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 8, 2017
PubMed
Summary

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This study reveals that surfactant-stabilized oil droplets are repelled by surfaces, simplifying marine oil-water separation. Efficient filtration is achieved using standard filters when pore size matches droplet diameter, minimizing pressure drop.

Area of Science:

  • Environmental science
  • Materials science
  • Chemical engineering

Background:

  • Petroleum hydrocarbon contamination poses significant threats to aquatic ecosystems.
  • Marine oil-water separation is crucial for environmental protection.
  • Surfactant-assisted dispersion of oil enhances separation efficiency by increasing interfacial area.

Purpose of the Study:

  • To investigate the wetting and transport behavior of surfactant-stabilized oil droplets.
  • To determine optimal flow conditions for sieving and separating these emulsions.
  • To develop efficient and cost-effective oil-water separation methods.

Main Methods:

  • Simulations and experimental investigations of droplet behavior on meshes.
  • Analysis of the effect of emulsion flow rate on droplet transport and impact.

Related Experiment Videos

  • Characterization of surface wetting properties of surfactant-stabilized droplets.

    • Main Results:

    • Water-soluble surfactant-stabilized droplets exhibit intrinsic underwater superoleophobicity, repelling various materials.
    • No surface micro-/nanotexturing or chemical treatment is required to prevent oil fouling.
    • Efficient separation of oil droplets (d < 100 μm) achieved with commercially available filters at a flux of ~11,000 L m⁻² h⁻¹ bar⁻¹.
    • Optimal filtration occurs when mesh pore opening (w) is approximately equal to droplet diameter (d), minimizing pressure drop.

    Conclusions:

    • Surfactant-stabilized oil droplets are effectively repelled by surfaces, simplifying separation processes.
    • Standard filters can be used for efficient oil-water separation by matching pore size to droplet diameter.
    • Findings provide a foundation for designing advanced, cost-effective oil separation materials and systems.