Capillary-based, multifunctional manipulation of particles and fluids via focused surface acoustic waves

Area of Science:

• Acoustofluidics
• Biophysics
• Nanotechnology

Background:

• Surface acoustic wave (SAW) acoustofluidics are increasingly used in biology and medicine.
• Current SAW devices typically use custom polymer channels, limiting integration with standard labware.
• There is a need for SAW acoustofluidic systems compatible with readily available glass tubes.

Purpose of the Study:

• To develop a novel capillary-based SAW acoustofluidic device.
• To demonstrate multifunctional particle and fluid manipulation using glass capillaries.
• To investigate the underlying actuation mechanisms through simulations.

Main Methods:

• Constructed a capillary-based SAW acoustofluidic device integrating a glass capillary and a converging interdigitated transducer.
• Performed finite element simulations incorporating piezoelectric, solid mechanic, and pressure acoustic physics.
• Experimentally validated device performance for particle and fluid manipulation tasks.

Main Results:

• The device successfully manipulated particles and fluids within a glass capillary.
• Demonstrated functions include particle enrichment, patterning, transport, and controlled droplet generation.
• Finite element simulations provided insights into the device's actuation mechanisms.

Conclusions:

• The developed capillary-based SAW acoustofluidic device offers a versatile platform for particle and fluid handling.
• This technology integrates easily with standard glass capillaries, enhancing practicality.
• Potential applications include pharmaceutical manufacturing, biofabrication, and bioanalysis.