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Shape and buckling transitions in solid-stabilized drops.

Hui Xu1, Sonia Melle, Konstantin Golemanov

  • 1Department of Chemical Engineering, Stanford University, Stanford, California, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 19, 2005
PubMed
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Shrinking particle-covered droplets transition from fluid to solid films due to surface compression. This shape change is reversible, with internal pressure changes indicating an approaching buckling transition.

Area of Science:

  • Fluid dynamics
  • Materials science
  • Surface chemistry

Background:

  • Particle-laden droplets exhibit complex behaviors under changing conditions.
  • Crystalline arrangements of particles at interfaces are well-documented on flat surfaces.

Purpose of the Study:

  • To investigate shape and buckling transitions in shrinking particle-laden sessile and pendant droplets.
  • To understand the effect of surface area reduction on particle monolayer behavior.

Main Methods:

  • Utilized monodisperse polystyrene particles at the water-decane interface.
  • Controlled droplet volume reduction to induce surface compression.
  • Measured internal droplet pressure during volume changes.

Main Results:

Related Experiment Videos

  • Observed a transition from a fluid to a solid particle film as droplet volume decreased.
  • Demonstrated reversible shape transitions due to capillary forces.
  • Detected significant internal pressure changes near the buckling transition point.

Conclusions:

  • Surface compression drives fluid-to-solid film transitions in particle-laden droplets.
  • Capillary forces ensure reversibility of droplet shape changes.
  • Internal pressure measurements provide insights into buckling phenomena.