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Related Experiment Videos

Sprouting Droplets Driven by Physical Effects Alone.

Katherine A Rumble1, Iliya D Stoev1, David J French1

  • 1School of Physics and Astronomy, University of Edinburgh , Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 15, 2017
PubMed
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Small droplets in a three-liquid system with silica colloids exhibit dramatic growth, sprouting tubes upward due to physical effects. Solvent partitioning drives this growth, which is chemically selective and influenced by interfacial tension and phase diagrams.

Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Fluid Dynamics

Background:

  • Partially miscible three-liquid systems offer complex interfacial phenomena.
  • Interfacial phenomena can be modulated by trapped colloidal particles.
  • Droplet dynamics are crucial in multiphase systems.

Purpose of the Study:

  • To investigate droplet growth phenomena in a three-liquid system with silica colloids.
  • To elucidate the physical mechanisms driving droplet growth.
  • To correlate growth behavior with system thermodynamics and interfacial properties.

Main Methods:

  • Utilized a partially miscible three-liquid system containing water, toluene, and a variable third liquid.
  • Incorporated interfacially trapped silica colloids to stabilize droplets.

Related Experiment Videos

  • Observed and analyzed droplet growth, tube sprouting, and solvent exchange using visual methods.
  • Introduced a pendant drop to probe solvent partitioning and chemical selectivity.

    • Main Results:

    • Demonstrated that droplets exhibit significant growth driven solely by physical effects.
    • Observed the formation of vertically upward-growing tubes from dense droplets in a gravitational field.
    • Showed that varying the third liquid alters growth behavior, correlating with phase diagrams and interfacial tension.
    • Confirmed growth is driven by solvent partitioning, which is chemically selective and can induce further growth phenomena.

    Conclusions:

    • Droplet growth in this system is a physically driven phenomenon, not requiring chemical reactions.
    • Interfacial tension and the three-fluid phase diagram are critical factors influencing droplet morphology and growth.
    • Chemically selective solvent exchange between droplets is a key mechanism for sustained growth and complex dynamic behaviors.