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Particle size and substrate wettability dependent patterns in dried pendant drops.

P Logesh Kumar1, Sumesh P Thampi1, Madivala G Basavaraj1

  • 1Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, 600036, Chennai, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 15, 2020
PubMed
Summary

Drying colloidal particle-laden drops can form coffee ring patterns or central domes. Particle size and substrate wettability influence these patterns, especially in pendant drop configurations, altering deposit morphology.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Drying drops of particle suspensions often form characteristic coffee ring patterns.
  • Particle-laden drops drying in configurations other than sessile mode can create novel deposit patterns.

Purpose of the Study:

  • Investigate the combined effects of particle size and substrate wettability on deposit patterns.
  • Examine patterns formed by drying drops in both sessile and pendant configurations.

Main Methods:

  • Experimental investigation of drying drops with varying particle sizes and substrate wettabilities.
  • Utilized sessile and pendant drop configurations.
  • Employed particle-based simulations to model deposition kinetics.

Main Results:

  • Observed a transition from coffee ring to central dome morphology with decreased wettability in pendant drops (3 μm particles).
  • Similar morphological transitions occurred with increased particle diameter in pendant drops on neutral wettability substrates.
  • Analyzed the influence of particle size, wettability, and drop configuration on particle deposition kinetics.

Conclusions:

  • Particle size and substrate wettability are critical factors controlling deposit morphology in drying colloidal drops.
  • Drop configuration (sessile vs. pendant) significantly impacts pattern formation.
  • Understanding these factors is crucial for controlling particle deposition in various applications.