Reconfigurable Acoustofluidic Microvortices for Selective Microcargo Delivery.

Area of Science:

• Microfluidics
• Biomedical Engineering
• Acoustofluidics

Background:

• Microscale cargo delivery is crucial for precise therapies but faces challenges in traditional methods like slow infusion and poor selectivity.
• Existing systems often lack adaptability and high throughput for complex microvascular networks.

Purpose of the Study:

• To introduce a novel reconfigurable microvortex generator (r-MVG) system for adaptive and high-throughput microscale cargo delivery.
• To demonstrate a frequency-encoded acoustofluidic actuation mechanism for programmable control of microvortices.

Main Methods:

• Developed r-MVGs utilizing pairwise microbubble resonance encoding under a tunable ultrasound field.
• Implemented a frequency-encoded acoustofluidic actuation mechanism enabling dynamic switching between multiple modes.
• Designed acoustically driven micromachines with programmable active components and passive nozzles controlled by microbubbles.

Main Results:

• Demonstrated controlled attraction-repulsion transitions and programmable microvortex reconfiguration via distinct microbubble resonance frequencies.
• Achieved real-time switching between capture, release, and directional delivery modes.
• Successfully guided payloads selectively through a trifurcated microchannel network using active flow control.

Conclusions:

• The frequency-encoded r-MVG system establishes a new paradigm for adaptive, multimodal, and high-throughput acoustofluidic delivery.
• This technology holds significant potential for applications in microfluidics, biomedicine, advanced manufacturing, and nano-reservoir exploration.