Scaleable production of microbubbles using an ultrasound-modulated microfluidic device

Area of Science:

• Biomedical Engineering
• Materials Science
• Acoustics

Background:

• Surfactant-coated gas microbubbles are crucial for ultrasound imaging and therapeutics.
• Conventional methods like sonication yield broad size distributions and contamination risks.
• Microfluidics offer size control but suffer from low production rates and clogging.

Purpose of the Study:

• To develop a hybrid sonication-microfluidic ('sonofluidic') device for microbubble production.
• To achieve high-throughput, size-controlled microbubble generation.
• To compare the sonofluidic method with conventional sonication.

Main Methods:

• Development of a sonofluidic device combining T-junction bubble generation with microchannel sonication.
• Production of microbubbles using the sonofluidic device and conventional sonication.
• Characterization of microbubble size, concentration, and stability.

Main Results:

• The sonofluidic device rapidly produced microbubbles (mean diameter: 1-2 μm) at rates exceeding 10^8 s^-1.
• Microbubbles generated by the sonofluidic device were consistently <5 μm, eliminating the need for fractionation.
• Size, concentration, and stability were comparable to microbubbles produced by conventional sonication.

Conclusions:

• The sonofluidic device offers a high-yield, controlled method for producing ultrasound microbubbles.
• This approach overcomes limitations of existing sonication and microfluidic techniques.
• The resulting microbubbles are suitable for ultrasound imaging and therapeutic applications without post-processing.