Capillary force on colloidal particles in a freely suspended liquid thin film

J Sur, HK Pak - Physical review letters, 2001 - APS
J Sur, HK Pak
Physical review letters, 2001APS
The dynamic behavior of micron-sized polystyrene latex particles confined in a free-standing
liquid film is experimentally studied. When the thickness of the film is less than the particle
diameter and varies depending on position, the particles are accelerated toward the thicker
region. Using a simple geometrical model and hydrodynamic theory, we calculate the
capillary force on the particle. The drag coefficient of the particle is found to depend on the
thickness of the film from the value of near zero to the Stokes' drag coefficient.
Abstract
The dynamic behavior of micron-sized polystyrene latex particles confined in a free-standing liquid film is experimentally studied. When the thickness of the film is less than the particle diameter and varies depending on position, the particles are accelerated toward the thicker region. Using a simple geometrical model and hydrodynamic theory, we calculate the capillary force on the particle. The drag coefficient of the particle is found to depend on the thickness of the film from the value of near zero to the Stokes' drag coefficient.
American Physical Society
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