Particle capturing via droplet impact on superhydrophobic mesh

Area of Science:

• Microfluidics
• Materials Science
• Chemical Engineering

Background:

• Droplet-based microreactors are crucial for drug discovery and materials exploration.
• Incorporating particulate inclusions enhances microreactor functionality but lacks precise control.
• Existing methods struggle with controlled particle capture in microfluidic systems.

Purpose of the Study:

• To develop a precise method for capturing microparticles within droplets using controlled droplet impact.
• To overcome the limitations of current particle incorporation techniques in microreactors.
• To enhance the functionality of droplet-based microreactors through controlled particulate inclusion.

Main Methods:

• Investigated droplet impingement on a superhydrophobic mesh using controlled experiments.
• Employed high-speed imaging to analyze jet dynamics and particle capture.
• Tuned droplet energy, mesh-to-housing distance, and examined particle/medium properties.

Main Results:

• Achieved tunable capture of microparticles over three orders of magnitude (∼10 to ∼2000 particles/droplet).
• Successfully captured nanoscale dye particles from sub-microgram samples.
• Demonstrated particle capture in highly viscous (58 mPa·s) and low surface tension (33.67 mN/m) media.

Conclusions:

• The developed method offers precise and versatile particle capture for droplet microreactors.
• This technique is applicable to diverse fields including biomedical analysis and drug discovery.
• Enables precise capturing and encapsulation of particles for advanced material synthesis.