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Laser-Induced Trapping of Microbubbles within the Bulk Solution.

Amartya Mandal¹, Qiushi Zhang¹, Renzheng Zhang¹

¹Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 14, 2025

Summary

Researchers generated and trapped microbubbles in bulk water using laser-induced Marangoni flow. These light-directed microbubbles move at speeds up to 0.9 mm/s, opening new possibilities for applications in bulk liquids.

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Area of Science:

Fluid dynamics
Microfluidics
Laser-matter interactions

Background:

Microbubble generation and manipulation typically occur on surfaces.
Controlling microbubbles in the bulk liquid presents significant challenges.

Purpose of the Study:

To report the generation and trapping of microbubbles in the bulk of water.
To demonstrate directed movement of these microbubbles using light.

Main Methods:

Utilizing a plasmonic suspension subjected to laser irradiation.
Leveraging light intensity-induced temperature gradients to create Marangoni flow.
Employing Marangoni flow to trap and direct microbubbles.

Main Results:

Successfully generated and trapped microbubbles at the laser boundary in bulk water.
Demonstrated directed movement of trapped microbubbles via light control.
Achieved microbubble velocities of at least 0.9 mm/s.

Conclusions:

Light-induced Marangoni flow can effectively trap and manipulate microbubbles in bulk liquids.
This technique expands microbubble applications beyond surfaces into the liquid bulk.
Potential applications include drug delivery and nano/microfabrication.