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Propylene glycol-water droplets form stable, self-contracting shapes on glass due to evaporation-driven Marangoni flow. These droplets exhibit unique sliding behavior on slopes, with motion directly related to slope angle and droplet properties.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Propylene glycol-water mixtures form droplets on glass, defying expectations for high-energy surfaces.
  • Droplet stability is maintained by Marangoni flow, driven by concentration gradients from evaporation.
  • These droplets possess unique properties, including lack of pinning and movement under humidity gradients.

Purpose of the Study:

  • To investigate the sliding motion of propylene glycol-water droplets on inclined surfaces.
  • To compare the behavior of these volatile droplets with non-volatile ones.
  • To analyze the influence of various parameters on droplet motion.

Main Methods:

  • Controlled deposition of propylene glycol-water mixtures on glass slides.
  • Precise control of external humidity.
  • Measurement of droplet apparent contact angles, volume, viscosity, and surface tension.
  • Analysis of droplet motion on slopes at varying velocities.

Main Results:

  • Droplets exhibit negligible pinning force.
  • For low velocities, the capillary number (Ca) is directly proportional to the Bond number (Bo) and the sine of the slope angle (α): Ca = Bo sin α.
  • The apparent contact angle is dependent on droplet concentration and external humidity.
  • Droplet shapes change with increasing sliding velocity.

Conclusions:

  • Evaporation-induced Marangoni flow is key to the stability and unique properties of these droplets.
  • The sliding dynamics of these volatile droplets can be accurately modeled by relating capillary and Bond numbers.
  • External humidity and droplet composition significantly influence droplet behavior and motion.