Controlled release of nanoparticles and macromolecules from responsive microgel capsules

Area of Science:

• Materials Science
• Chemical Engineering
• Biomedical Engineering

Background:

• Stimuli-responsive microgels are advanced materials for controlled release applications.
• Understanding solute release mechanisms from microcapsules is crucial for optimizing delivery systems.

Purpose of the Study:

• To investigate nanoparticle and macromolecule release from stimuli-responsive microgel capsules.
• To explore the mechanisms of steady and pulsatile release based on microgel swelling and deswelling.

Main Methods:

• Mesoscale computational modeling was employed to simulate microgel capsule behavior.
• The model analyzed the release of nanoparticles and linear macromolecules under varying stimuli.

Main Results:

• Responsive microcapsules facilitate both steady diffusive release (swollen state) and pulsatile discharge (deswelling state).
• Deswelling induces a hydrodynamic release driven by solvent outflow, controllable with internal rigid rods.

Conclusions:

• Stimuli-responsive microcapsules provide an effective platform for controlled release applications.
• The findings suggest potential for designing advanced drug delivery systems using these microcarriers.