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Three-Dimensional Imaging of Emulsion Separation through Liquid-Infused Membranes Using Confocal Laser Scanning

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Liquid-infused membranes (LIMs) show promise for removing emulsified oils from water by forming oil channels. Channel formation dynamics, influenced by oil concentration and operating conditions, dictate permeate flux and antifouling properties.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Emulsified oil removal from water is challenging due to stable small droplets.
  • Membrane fouling significantly reduces capacity in conventional membrane treatments.
  • Liquid-infused membranes (LIMs) offer a potential solution to fouling but face limitations in permeate flux.

Purpose of the Study:

  • To investigate the transport mechanism in LIMs for oil-in-water emulsion removal.
  • To understand the role of oil droplet coalescence and channel formation in LIM performance.
  • To identify factors influencing permeate flux and antifouling behavior in LIMs.

Main Methods:

  • Utilized confocal laser scanning microscopy (CLSM) for 3D imaging.
  • Reconstructed events during LIM startup and operation.
  • Employed image analysis to quantify channel formation and correlate with permeate flux.

Main Results:

  • Observed oil droplet coalescence on the LIM surface and oil channel formation within the membrane.
  • Found that the rate and number of oil channels govern permeate flux.
  • Demonstrated that feed oil concentration, infused liquid viscosity, and operating pressure impact channel formation dynamics.

Conclusions:

  • Channel formation dynamics are critical for controlling permeate flux in LIMs.
  • Optimizing operating conditions and material properties can enhance LIM performance for oil removal.
  • High affinity of the infused liquid to the pore wall is crucial for antifouling properties.