Solidification-Controlled Compartmentalization of Bismuth-Tin Colloidal Particles

Area of Science:

• Materials Science
• Metallurgy
• Colloid Science

Background:

• Microstructure formation relies on nucleation and growth, controllable in bulk materials via catalytic sites or gradients.
• Controlling microstructure at micrometer scales remains challenging.
• Classical metallurgy principles offer a foundation for advanced materials fabrication.

Purpose of the Study:

• To transfer knowledge from classical metallurgy to colloidal particle fabrication.
• To develop strategies for controlling phase distribution within individual alloy particles.
• To enable scalable production of complex, compartmentalized particles.

Main Methods:

• Exploiting the core-shell structure of liquid metals within constrained particle volumes.
• Adjusting solidification conditions to manipulate phase separation pathways.
• Utilizing controlled cooling and processing techniques for alloy solidification.

Main Results:

• Demonstrated transformation of identical alloy particles into various microstructures: lamellar, composite, Janus, and striped.
• Achieved precise control over internal phase distribution by selecting specific solidification pathways.
• Successfully produced diverse particle morphologies from a single alloy system.

Conclusions:

• The proposed methodology enables unprecedented control over colloidal particle microstructure.
• This approach offers a scalable and high-yield route to producing complex compartmentalized particles.
• The findings open new avenues for designing advanced functional materials at the nanoscale.