Acoustofluidic Biosensors

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Traditional diagnostic methods face challenges in speed, sample preparation, and instrumentation.
• Acous­tofluidics, combining acoustics and microfluidics, presents a promising alternative for point-of-care testing (POCT).
• Bulk Acoustic Wave (BAW) and Surface Acoustic Wave (SAW) technologies facilitate contactless, label-free manipulation of bioparticles.

Purpose of the Study:

• To review recent advancements in BAW- and SAW-based acoustofluidic biosensors.
• To elucidate the principles of acoustic modes (QCM, FBAR, SMR, Rayleigh, Love waves) in biosensing applications.
• To evaluate the potential of acoustofluidics in accelerating diagnostic workflows and enabling multimodal detection.

Main Methods:

• Review of current literature on BAW and SAW acoustofluidic biosensors.
• Analysis of distinct acoustic modes and their applications in liquid-phase sensing, particle sorting, and cellular focusing.
• Investigation of integrated on-chip sample preparation and multimodal detection strategies.

Main Results:

• On-chip sample preparation integrated with acoustofluidics reduces assay times to under 10 minutes.
• Coupling acoustic manipulation with other modalities achieves ultrasensitive, multimodal detection, overcoming diffusion limits.
• Successful applications demonstrated in oncology and infectious disease diagnostics.

Conclusions:

• Acous­tofluidic biosensors offer rapid, precise, and label-free detection for clinical diagnostics.
• Addressing challenges like acoustothermal heating and biofouling is crucial for translation.
• Future directions include AI-driven microfluidics, modular designs, and wearable platforms for democratized diagnostics.