Sub-wavelength acoustic stencil for tailored micropatterning

Area of Science:

• Biomedical Engineering
• Microfluidics
• Acoustofluidics

Background:

• Acoustofluidic devices offer biocompatible micromanipulation for cell-scale applications.
• Creating complex, designed microscale patterns for cells and particles remains a significant challenge.

Purpose of the Study:

• To develop an acoustofluidic approach for arbitrary and reversible microscale patterning of particles and cells.
• To overcome limitations in creating complex structures for cell manipulation and tissue engineering.

Main Methods:

• Utilized an acoustofluidic system with a structured surface containing wells, trenches, and cavities.
• Employed a half-wavelength acoustic field to create an 'acoustic stencil' for directed manipulation.
• Generated multiplexed parallel patterning using a bulk-wavemode lithium niobate resonator and multilayer resonant geometry.
• Achieved cell-scale resolution via structured sub-wavelength microfeatures within a scalable device area.

Main Results:

• Demonstrated reversible patterning of 5, 10, and 15 μm particles and 293-F cells in diverse configurations.
• Successfully created arbitrary cell and particle arrangements using the 'acoustic stencil' approach.
• Enabled simultaneous, unidirectional manipulation across scalable areas (∼cm²) within a microfluidic device.

Conclusions:

• The developed acoustofluidic method provides a powerful tool for generating highly complex and designed microscale acoustic patterns.
• This technique is highly enabling for various cell studies and tissue engineering applications requiring precise spatial arrangement of biological entities.
• Offers a scalable and versatile solution for advanced micromanipulation tasks in biomedical research.