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Self-Templated Generation of Triggerable and Restorable Nonequilibrium Micelles
Claudia Dähling1, Judith E Houston2, Aurel Radulescu2
1Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
ACS Macro Letters
|May 28, 2022
Summary
This study introduces a novel thermoresponsive polyelectrolyte system for creating kinetically stable micelles with tunable shapes. The method allows for pathway-dependent preparation of spherical or cylindrical micelles under identical final conditions.
Area of Science:
- Polymer Science
- Materials Chemistry
- Supramolecular Chemistry
Background:
- Micellar transformations are crucial for various applications but achieving different morphologies under identical conditions is difficult.
- Thermoresponsive polymers offer dynamic control over self-assembly, but kinetic stability of non-equilibrium structures remains a challenge.
Purpose of the Study:
- To develop a thermoresponsive polyelectrolyte system for pathway-dependent preparation of kinetically stable micelles with distinct morphologies.
- To demonstrate the ability to create and control non-equilibrium micellar structures under the same final environmental conditions.
Main Methods:
- Utilizing a temperature-induced structure switch in a polyelectrolyte system with a plasticizer (salt).
- Employing a salt concentration reduction at specific temperatures to kinetically freeze interpolyelectrolyte complex (IPEC) micelle morphologies.
- Investigating the temperature and salt concentration dependence of micelle formation and stability.
Main Results:
- Successfully generated kinetically stable spherical star-like and cylindrical micelles from the same system by controlling preparation pathways.
- Demonstrated that the prepared non-equilibrium morphologies are stable across different temperatures, with structure encoded in the frozen IPECs.
- Showcased repeatable, on-demand switching between non-equilibrium and equilibrium micellar states triggered by salt concentration.
Conclusions:
- The developed thermoresponsive polyelectrolyte system enables the preparation of diverse, kinetically stable micellar morphologies under identical final conditions.
- This pathway-dependent control over self-assembly offers a novel approach for designing materials with tunable and switchable structures.
- The system's ability to be repeatedly reset highlights its potential for advanced responsive materials and controlled assembly applications.
