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Controlling the Formation of Polyelectrolyte Complex Nanoparticles Using Programmable pH Reactions
Christian C M Sproncken1, Berta Gumí-Audenis1, Sanam Foroutanparsa1
1Laboratory of Self-Organizing Soft Matter, Department of Chemical Engineering and Chemistry, Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MBEindhoven, The Netherlands.
Macromolecules
|January 16, 2023
Summary
This study demonstrates temporal control over polyelectrolyte coassembly using a pH-modulating clock reaction. This method creates stable nanoparticles, unlike uncontrolled aggregation in similar systems.
Area of Science:
- Polymer Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Controlling polyelectrolyte complexation is crucial for designing advanced materials.
- Temporal control over self-assembly remains a significant challenge in polymer science.
- Existing methods often lack precise control over assembly kinetics and stability.
Purpose of the Study:
- To develop a method for achieving temporal control over polyelectrolyte coassembly.
- To investigate the formation of stable, nanoscopic complex coacervates using a programmable pH-modulation system.
- To explore the influence of chemical reactions on polyelectrolyte assembly dynamics.
Main Methods:
- Mixing oppositely charged polyelectrolytes (poly(allylamine hydrochloride) and poly(sodium methacrylate)) in a (bi)sulfite buffer.
- Initiating a formaldehyde-sulfite clock reaction to induce pH changes and polymer modification.
- Utilizing an acid-producing reaction for further temporal control over nanoparticle lifetime.
Main Results:
- Formation of nanoscopic complex coacervates with core-shell structures.
- Achieved long-term colloidal stability (months) of nanoparticles, contrasting with rapid aggregation in control systems.
- Demonstrated tunable nanoparticle lifetimes (tens of minutes) using acid-producing reactions.
Conclusions:
- The formaldehyde-sulfite clock reaction provides effective temporal control over polyelectrolyte coassembly.
- This approach enables the creation of stable, core-shell polymeric nanoparticles with tunable properties.
- Programmable pH modulation offers a versatile strategy for designing dynamic polymer assemblies.
