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Related Experiment Video

Updated: Apr 11, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Measured capillary forces on spheres at particle-laden interfaces.

Wei He1, Nesrin Şenbil, A D Dinsmore

  • 1Department of Physics, University of Massachusetts, Amherst, MA, USA. dinsmore@physics.umass.edu.

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Summary
This summary is machine-generated.

Particle crowding at fluid interfaces reduces capillary forces, impacting particle stabilization. This finding is crucial for designing effective particles in applications like oil dispersants.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Understanding capillary forces on particles at fluid interfaces is essential for developing effective particle stabilizers.
  • Particle stabilization is critical in various applications, including emulsions, dispersions, and microfluidics.

Purpose of the Study:

  • To measure capillary forces on particles at fluid interfaces.
  • To identify key parameters that determine effective particle stabilization.
  • To investigate the effect of particle crowding on capillary forces.

Main Methods:

  • A millimeter-scale particle attached to a cantilever was pulled perpendicular to the fluid interface.
  • Cantilever deflection was measured to determine pulling force.
  • Simultaneous side imaging captured particle height and interface shape.

Main Results:

  • Peak capillary force on a particle at a crowded interface was consistently smaller than at a clean interface.
  • This force reduction was independent of fluid density differences, particle material, and capillary charge.
  • Force reduction was attributed to interface shape perturbations caused by neighboring particles.

Conclusions:

  • Particle crowding significantly reduces capillary forces at fluid interfaces.
  • Interface shape perturbation is the primary mechanism for this force reduction.
  • These findings aid in designing particles for enhanced droplet stabilization in dispersants and other systems.