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Self-assembled nanoparticle-coated interfaces: Capillary pressure, shell formation and buckling.

Q Liu1, Z Sun2, J Carlos Santamarina1

  • 1Earth Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.

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Nanoparticle accumulation at fluid interfaces alters droplet mechanics, causing buckling and asymmetric responses. Particle-coated interfaces significantly impact fluid displacement in porous media.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Particle accumulation at fluid interfaces can significantly alter interfacial behavior.
  • This can lead to unusual phenomena, including asymmetric macroscopic mechanical responses.

Purpose of the Study:

  • To explore nanoparticle accumulation at fluid interfaces.
  • To investigate the mechanical response of nanoparticle-coated droplets during contraction and expansion.

Main Methods:

  • Simultaneous recording of droplet shape and capillary pressure during droplet tests.
  • Single-pore experiments to examine particle-coated interfaces traversing pore constrictions.
  • Modification of nanoparticles with cetyltrimethylammonium bromide.

Main Results:

  • Nanoparticle accumulation at interfaces is diffusion-controlled.
  • Nanoparticle-coated droplets sustain negative capillary pressure before buckling.
  • Buckling patterns depend on boundary conditions (crumples vs. depressions).
  • Asymmetric interfacial response observed: oil droplet in nanofluid bath withstands higher pressure than nanofluid droplet in oil bath.
  • Particle-coated interfaces significantly affect fluid displacement in porous media.

Conclusions:

  • Interfacial ordering of nanoparticles influences macroscopic mechanical properties.
  • Asymmetric behavior can be explained by interaction forces.
  • Particle-coated interfaces play a crucial role in porous media fluid dynamics.