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Related Experiment Videos

Spreading of nanofluids driven by the structural disjoining pressure gradient.

Anoop Chengara1, Alex D Nikolov, Darsh T Wasan

  • 1Department of Chemical Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA.

Journal of Colloid and Interface Science
|October 13, 2004
PubMed
Summary

Structural disjoining pressure from nanoparticles drives liquid film spreading. Smaller, concentrated, and uniform nanoparticles enhance this effect, impacting applications like detergency.

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Area of Science:

  • Colloid and Surface Science
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Structural disjoining pressure originates from nanoparticle layering in confined geometries, linked to increased system entropy.
  • This pressure, notably strong and long-range, significantly influences liquid film spreading and interfacial behavior.
  • Its role in applications such as detergency is gaining recognition due to its impact on liquid wedges.

Purpose of the Study:

  • To investigate the parametric effects of nanoparticle characteristics on liquid film spreading.
  • To analyze how nanoparticle size, concentration, and polydispersity influence the displacement of an oil-aqueous interface.
  • To understand the interplay between structural disjoining pressure and capillary forces in controlling spreading phenomena.

Main Methods:

Related Experiment Videos

  • Parametric study of nanoparticle size, concentration, and polydispersity.
  • Solution of extended Laplace-Young equations to model meniscus profile and contact line position.
  • Simulation of oil-aqueous interface displacement driven by structural disjoining pressure.

Main Results:

  • Increased nanoparticle volume fraction enhances contact line displacement.
  • Smaller nanoparticle size leads to greater displacement for the same volume fraction.
  • Monodispersed nanoparticles promote more significant displacement than polydispersed ones.
  • Reduced resisting capillary pressure (low interfacial tension or large dispersed phase radius) favors greater displacement.

Conclusions:

  • Structural disjoining pressure is a key driver of nanoparticle-laden liquid film spreading.
  • Nanoparticle properties (size, concentration, uniformity) critically modulate spreading behavior.
  • Controlling these parameters, alongside interfacial tension and dispersed phase size, can optimize interfacial displacement for various applications.