Controlled synthesis of solid-shelled non-spherical and faceted microbubbles

Area of Science:

• Materials Science
• Microfluidics
• Nanotechnology

Background:

• Controlling hollow particle shape is crucial for applications like enhanced encapsulation and improved material properties.
• Conventional methods for fabricating shaped hollow particles often result in low yields, poor shape control, and complex processes.

Purpose of the Study:

• To present a new method for fabricating polyhedral graphene oxide (GO)-shelled microbubbles with defined edges and vertices.
• To explore the mechanisms driving the shape transformation from spherical to polyhedral structures.

Main Methods:

• Microfluidic generation of spherical compound bubbles.
• Controlled shell deformation driven by outward gas transport and Laplace pressure.
• Manipulation of shell composition and thickness to influence shape.

Main Results:

• Successful fabrication of polyhedral GO-shelled microbubbles with sharp edges and vertices.
• Demonstrated control over bubble shapes, including tetrahedral and octahedral structures.
• Identified shell instability due to gas transport and compositional heterogeneity as key factors in shape transformation.

Conclusions:

• The presented microfluidic strategy enables the controlled fabrication of 3D structured solid bubbles with polyhedral shapes.
• This method overcomes limitations of conventional techniques, offering a new route for producing high-performance microbubbles.
• The developed technique is advantageous for applications in advanced mechanical and thermal materials.