Power-controlled acoustofluidic manipulation of microparticles

Area of Science:

• Acoustofluidics
• Microparticle Manipulation
• Surface Acoustic Waves

Background:

• Surface acoustic wave (SAW) acoustofluidics offers accurate and biocompatible microparticle and cell separation.
• Precise control of input power is crucial for optimizing acoustic radiation force in acoustofluidic devices.

Purpose of the Study:

• To develop an acoustophoretic system using SAW interdigital electrode devices.
• To investigate the relationship between input power and separation efficiency for microparticles of varying sizes.

Main Methods:

• Utilized SAW interdigital electrode devices for acoustophoresis.
• Employed power meters to monitor incident and reflected SAW powers.
• Performed theoretical analysis to predict optimal input power and separation positions.

Main Results:

• Demonstrated that a specific range of input powers is required to migrate microparticles to pressure nodes.
• Calculated and compared separation efficiencies for 20 µm, 15 µm, 10 µm, and 5 µm microspheres.
• Identified optimal input power ranges for separating mixtures of these microspheres.

Conclusions:

• The study provides practical guidance for operating SAW devices in bioparticle separation.
• Incident power serves as a key control parameter for achieving efficient microparticle separation.