Janus Polymeric Giant Vesicles on Demand: A Predictive Phase Separation Approach for Efficient Formation.

Area of Science:

• Polymer Science
• Materials Science
• Biotechnology

Background:

• Janus particles exhibit intrinsic asymmetry, driving interest in applications like emulsion stabilization, micro/nanomotors, imaging, and drug delivery.
• Janus polymersomes are promising for synthetic cell development and drug delivery, but their fabrication is often empirical.

Purpose of the Study:

• To propose a rational, theory-guided approach for fabricating asymmetric Janus polymersomes.
• To experimentally validate the predictive power of Flory-Huggins theory for Janus polymersome self-assembly.

Main Methods:

• Utilizing Flory-Huggins theory to predict block copolymer self-assembly into Janus polymersomes.
• Employing electroformation for the fabrication of Janus giant unilamellar vesicles (JGUVs).
• Characterizing polymersome morphology and yield through experimental validation.

Main Results:

• Achieved a high yield (>90%) of stable Janus giant unilamellar vesicles (JGUVs) using biocompatible block copolymers.
• Developed a phase diagram correlating mixing energy with polymersome morphology for JGUV design.
• Demonstrated extrusion for producing quasi-monodisperse Janus polymersomes while preserving morphology.

Conclusions:

• The proposed rational approach effectively predicts and enables the fabrication of Janus polymersomes.
• The developed phase diagram serves as a valuable tool for designing JGUVs.
• These polymersomes are suitable for asymmetric functionalization and application as active carriers in drug delivery and synthetic biology.