Real-time label-free imaging of living crystallization-driven self-assembly

Area of Science:

• Polymer science and materials engineering
• Nanotechnology and self-assembly

Background:

• Living crystallization-driven self-assembly (CDSA) constructs complex polymer microstructures.
• Precise control over CDSA is crucial for engineering these structures.

Purpose of the Study:

• To investigate the real-time growth dynamics of polymer structures during CDSA.
• To understand how reaction parameters influence the size, rate, and morphology of self-assembled polymer particles.
• To explore the composition distribution in complex, multi-annulus polymer platelets.

Main Methods:

• Application of interferometric scattering (iSCAT) microscopy for label-free, real-time observation.
• Monitoring the growth of individual poly(ε-caprolactone)-based fibers and platelets.
• Utilizing iSCAT's contrast mechanism to study multi-annulus structures.

Main Results:

• Real-time growth kinetics of polymer fibers and platelets were mapped.
• Key reaction parameters affecting platelet growth rate, size, and morphology were identified.
• Insights into the spatial distribution of polymer compositions within multi-annulus platelets were gained.

Conclusions:

• iSCAT microscopy is a powerful tool for understanding and controlling polymer self-assembly.
• This method advances the bottom-up construction of uniform polymer microstructures with complex hierarchies.
• The findings facilitate the precise engineering of advanced polymer materials.