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Confinement-induced chirality in phase-separated achiral polymer solutions
Baichuan Kou1, Jin-Sheng Wu2, Yingshan Ma1
1Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada.
Science Advances
|July 9, 2025
Summary
Achiral polymers confined in narrow capillaries spontaneously form chiral nematic structures. This discovery offers a new method for creating chiral materials from simple synthetic polymers.
Area of Science:
- Soft Matter Physics
- Polymer Science
- Materials Science
Background:
- Self-organization of polymers in confined spaces is crucial for advanced materials.
- Chiral organization is known for polymers with inherent chirality, but not for achiral polymers.
Purpose of the Study:
- To investigate the emergence of chirality in confined solutions of achiral polymers.
- To understand the mechanisms driving chiral structure formation under spatial confinement.
Main Methods:
- Confining achiral rigid-rod polymer solutions in narrow capillaries.
- Inducing kinetically arrested phase separation.
- Analyzing the resulting polymer structures using microscopy and structural analysis.
Main Results:
- Observed the spontaneous emergence of chirality in achiral polymers under confinement.
- Identified alternating isotropic and chiral nematic phases within the capillaries.
- Demonstrated that confined geometry, surface anchoring, and polymer properties drive chiral nematic formation.
- Chiral structures exhibited a catenoidal shape, mimicking biological structures.
Conclusions:
- Spatial confinement can induce chirality in achiral polymers.
- The interplay of geometry, surface interactions, and polymer properties dictates chiral organization.
- This provides a novel route to synthesize chiral structures from achiral synthetic polymers for potential applications in materials science.
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