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Controlling the morphology of microgels by ionic stimuli.
Maxime J Bergman1, Jan S Pedersen, Peter Schurtenberger
1Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden. njhboon@gmail.com.
Soft Matter
|February 28, 2020
Summary
Researchers precisely control microgel particle shapes by combining ionic stimuli. This allows separate tuning of the hydrogel core and polymer corona for advanced adaptive materials and drug delivery applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Matter Physics
Background:
- Stimuli-responsive microgels are crucial for drug delivery and adaptive materials.
- Ionic microgels, like poly(NIPAM-co-acrylic acid), respond mechanically to ionic strength and pH.
- Precise control over microgel morphology is essential for optimizing their functionality.
Purpose of the Study:
- To demonstrate how combining multiple ionic stimuli enables detailed control over microgel morphology.
- To investigate the internal structure and swelling behavior of ionic microgels under varied conditions.
- To achieve predictable tailoring of particle morphologies post-synthesis.
Main Methods:
- Analysis of microgel particle morphology using light-scattering techniques.
- Application of combined ionic stimuli (deionization and deprotonation) to modulate microgel structure.
- Investigation of hydrogel core and corona swelling responses.
Main Results:
- Evidence of an inverted density profile within the microgel core was observed.
- Separate control over the swelling of the hydrogel core and the corona was achieved.
- Combined deionization and deprotonation steps effectively targeted distinct microgel regions.
Conclusions:
- Combining ionic stimuli offers a powerful strategy for precise microgel morphology control.
- This approach allows for independent tuning of the hydrogel core and corona swelling.
- The findings advance the predictable, post-synthesis tailoring of microgel-based materials.
