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Interconnected drying phenomena in nanoparticle laden water-ethanol binary droplets.
Versha1, Deepa Lohani1, Subhendu Sarkar2
1Department of Physics, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab, 140001, India.
The European Physical Journal. E, Soft Matter
|March 20, 2021
Summary
This study reveals how ethanol and nanoparticle concentrations affect binary droplet evaporation. Higher ethanol content initially accelerates evaporation, while nanoparticles influence wettability and deposition patterns.
Area of Science:
- Physical Chemistry
- Materials Science
- Fluid Dynamics
Background:
- Understanding multi-component droplet evaporation is crucial for various technologies.
- Colloidal binary droplet systems present complex evaporation dynamics.
Purpose of the Study:
- Investigate the evaporation behavior of ethanol-water-nanoparticle binary droplets.
- Analyze the influence of ethanol and nanoparticle concentrations on wetting and evaporation.
Main Methods:
- Monitoring temporal changes in droplet contact angles, shapes, and volumes.
- Studying the collective effects of ethanol and polystyrene nanoparticle concentrations.
Main Results:
- Ethanol concentration nonlinearly affects droplet volume decrease; ethanol evaporates faster initially.
- Contact angle decreases with ethanol concentration but peaks at a specific nanoparticle concentration.
- Wettability increases with ethanol concentration, maximized at low nanoparticle concentrations.
- Rim width of deposition patterns increases with nanoparticle concentration.
- Nanoparticle segregation occurs due to rapid evaporation of volatile components at low concentrations.
Conclusions:
- Ethanol and nanoparticle concentrations have interconnected effects on droplet evaporation and wettability.
- Evaporation dynamics of binary mixtures differ significantly from pure water, offering insights for multi-component systems.
- The study highlights applications in controlling nanoparticle deposition and understanding complex fluid behavior.
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