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Updated: May 16, 2025
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
Published on: June 8, 2016
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Responsive wormlike micelles based on aspirin's reaction with hydroxylamine.
Nahyan T P Liz1, Swathi P Raju2, Pablo S Fernández2
1Department of Physical-Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-862 Campinas, São Paulo, Brazil.
Journal of Colloid and Interface Science
|May 14, 2025
Summary
Hydroxylamine triggers the formation of responsive wormlike micelles by converting acetylsalicylate to salicylate. This chemical change enhances salicylate
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Physical Chemistry
Background:
- Responsive materials offer tunable properties.
- Wormlike micelles are versatile self-assembled structures.
- Chemical triggers can control self-assembly dynamics.
Purpose of the Study:
- To investigate the use of hydroxylamine as a trigger for responsive wormlike micelle formation.
- To elucidate the mechanism of micelle elongation induced by chemical conversion.
- To correlate rheological changes with molecular transformations.
Main Methods:
- Dynamic oscillatory rheology for viscoelastic property evolution.
- In-situ FTIR, UV-Visible, and 1H NMR spectroscopy for chemical tracking.
- Cryo-Transmission Electron Microscopy (Cryo-TEM) for aggregate visualization.
Main Results:
- Hydroxylamine effectively induces wormlike micelle formation from acetylsalicylate and CTAB.
- Conversion to salicylate increases affinity for micellar palisade, reducing interfacial curvature.
- Rheological measurements show kinetics of micelle growth and network entanglement development.
Conclusions:
- Acetylsalicylate to salicylate conversion is a viable trigger for responsive wormlike micelle systems.
- Salicylate incorporation drives micelle elongation and entanglement.
- Multitechnique approach confirms molecular mechanism and macroscopic properties.
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