Stripe Patterns Formed on a Glass Surface during Droplet Evaporation

  • Adachi E
  • Dimitrov A
  • Nagayama K
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Abstract

When a suspension droplet dries on a glass surface, particles collect near the edge of the droplet boundary (contact line) and often leave a striped pattern as the droplet evaporates. During drying, the motion of the droplet contact line resembels stick-slip motion and it shrinks toward the center with an oscillarotry motion. to explain the oscillatory motino and the mechanism of the strip formation, we formulated a mathematical model that includes a friction force which the contact line feels when particles flow fromthe inside of the droplet to the droplet boundary. As a result of competition between this friction force and surface tensions at the contact line, the dcroplet oscillates as it drid and generates a striped film composed of particles

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Authors

  • Eiki Adachi

  • Antony S. Dimitrov

  • Kuniaki Nagayama

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