Pinch-off droplet generator using microscale gigahertz acoustics.
Yangchao Zhou1, Meihang He1, Haitao Zhang1
1State Key Laboratory of Precision Measuring Technology and Instruments, College of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
A new nozzle-free acoustic method generates microdroplets with unprecedented size control. This gigahertz bulk acoustic wave technology offers flexibility for biomedical and chemical applications, achieving high cell viability.
Area of Science:
- Fluid dynamics
- Acoustics
- Biotechnology
Background:
- Microdroplet generation is crucial for biomedicine, diagnostics, and chemistry.
- Existing methods often rely on nozzles or microchannels, limiting flexibility and droplet size range.
Purpose of the Study:
- To introduce a nozzle-free, acoustic-based method for microdroplet generation.
- To demonstrate the wide range of droplet sizes achievable with this new technique.
Main Methods:
- Utilizing a gigahertz (GHz) bulk acoustic wave (BAW) to generate droplets.
- Employing acoustic body force to pinch off a liquid column at an oil-water interface, avoiding nozzles or microchannels.
Main Results:
- Achieved droplet generation across four orders of magnitude (2 μm to 1800 μm) by controlling device power and working time.
- Demonstrated successful cell encapsulation with high cell viability.
Conclusions:
- The proposed acoustic method offers a versatile, nozzle-free approach for microdroplet generation.
- The technique supports a wide size range, varied viscosities, and biocompatibility, showing potential for miniaturization and scalability.
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