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Updated: Dec 5, 2025
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High Throughput Analysis of Liquid Droplet Impacts
Published on: March 6, 2020
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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.
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.
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.
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