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Charged hollow microgel capsules
Nabanita Hazra1, Janik Lammertz1, Andrey Babenyshev1
1Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074, Aachen, Germany. crassous@pc.rwth-aachen.de.
Soft Matter
|May 30, 2024
Summary
Researchers developed large, charged hollow microgels from poly(N-isopropylacrylamide-co-itaconic acid) for controlled release. These soft materials show tunable responsivity to stimuli like pH and temperature.
Area of Science:
- Soft matter physics
- Polymer science
- Materials chemistry
Background:
- Hollow microgels are soft materials with potential for encapsulation and controlled release.
- Previous work focused on small hollow microgels, limiting investigation methods.
- Large fluorescent hollow poly(N-isopropylacrylamide) microgels were synthesized using silica templates.
Purpose of the Study:
- To synthesize and characterize large, charged hollow microgels based on poly(N-isopropylacrylamide-co-itaconic acid).
- To compare the structure and responsivity of neutral and charged hollow microgels.
- To investigate the buckling behavior of these novel microgel systems.
Main Methods:
- Synthesis of charged hollow microgels using sacrificial silica templates.
- Confocal microscopy, atomic force microscopy, and light scattering techniques for characterization.
- Investigation of responsivity to temperature, pH, and ionic strength.
Main Results:
- Successfully synthesized large charged hollow microgels (P(NIPAM-co-IA)).
- Demonstrated the extremely soft nature of swollen charged hollow microgels.
- Observed tunable responsivity to pH, ionic strength, and temperature.
- Investigated the buckling behavior influenced by osmotic pressure and pH.
Conclusions:
- Large charged hollow microgels offer tunable properties for advanced applications.
- The synthesis approach using sacrificial templates is effective for creating complex microgel architectures.
- These soft, responsive materials show promise for encapsulation, controlled release, and conformational changes.
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