Investigation on submicron particle separation and deflection using tilted-angle standing surface acoustic wave...

Area of Science:

• Biotechnology
• Microfluidics
• Acoustics

Background:

• Submicron particle extraction from biological fluids is vital for in vitro diagnostics.
• Microfluidic separation, particularly using ultrasonic standing waves, offers efficient, label-free, and cost-effective solutions.
• Tilted-angle ultrasonic standing surface acoustic wave (taSSAW) fields are increasingly used for bioparticle separation.

Purpose of the Study:

• To analytically investigate submicron particle deflection in microfluidics utilizing taSSAWs.
• To analyze the influence of acoustic pressure, flow rate, tilted angle, and acoustic wave frequency on particle motion.
• To provide a reference for designing acoustofluidic devices for bioparticle separation.

Main Methods:

• Analytical investigation of submicron particle (0.1-1 μm) deflection under taSSAWs.
• Simulation analysis to optimize the tilted angle for particle separation.
• Experimental validation using polystyrene microspheres and exosomes from human plasma.

Main Results:

• Particle deflection is influenced by acoustic radiation forces, with larger particles deflecting towards nodal lines.
• Decreasing flow rate and increasing acoustic pressure or wave frequency improve particle deflection.
• Successful experimental separation of 100 nm polystyrene microspheres and 30-150 nm exosomes was achieved.

Conclusions:

• taSSAWs provide a powerful method for separating submicron particles in microfluidic devices.
• Optimizing parameters like flow rate, acoustic pressure, and frequency is crucial for efficient separation.
• This research supports the practical design and application of acoustofluidic systems for bioparticle isolation.