High-Performance and Environmentally-Friendly Bulk-Wave-Acoustofluidic Devices Driven by Lead-Free Piezoelectric...

Area of Science:

• Materials Science
• Acoustofluidics
• Piezoelectric Materials

Background:

• Bulk-wave-acoustofluidic devices offer high throughput for biological sample processing.
• Traditional devices use lead zirconate titanate (PZT), raising environmental and biocompatibility concerns.
• Lead-free alternatives often exhibit inferior piezoelectric properties compared to PZT.

Purpose of the Study:

• To evaluate the performance of lead-free (Bi,Na)TiO3-BaTiO3-(Bi,Na)(Mn,Nb)O3 (BNT-BT-BNMN) piezoelectric materials in bulk-wave-acoustofluidic devices.
• To compare BNT-BT-BNMN driven devices with traditional PZT-driven devices.
• To understand the underlying mechanisms for performance differences.

Main Methods:

• Experimental characterization of BNT-BT-BNMN piezoelectric materials.
• Numerical simulations of bulk-wave-acoustofluidic device performance.
• Comparative analysis of devices driven by BNT-BT-BNMN and PZT transducers.
• Particle manipulation experiments to assess focusing capabilities.

Main Results:

• BNT-BT-BNMN devices match PZT performance at low power and exceed it at intermediate power.
• Low acoustic impedance and weak transverse modes in BNT-BT-BNMN compensate for lower piezoelectric properties at low power.
• Superior performance of Mn-doped BNT-based materials at intermediate power aligns with findings.
• Achieved perfect focusing of 5-µm polystyrene particles at 10 mL/min flow rate with 1W input power.

Conclusions:

• Lead-free BNT-BT-BNMN piezoelectric materials are a viable and effective alternative to PZT for bulk-wave-acoustofluidic applications.
• The unique properties of BNT-BT-BNMN enable efficient acoustic field generation for high-throughput sample processing.
• This research paves the way for environmentally friendly and high-performance acoustofluidic devices.