Journal
ACS NANO
Volume 6, Issue 1, Pages 212-219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn2043143
Keywords
responsive hydrogel capsule; controlled release; drug delivery; polymer network; volume transition; dissipative particle dynamics
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Funding
- Petroleum Research Fund
- ICAM
- NSF through ICAM-I2CAM, 1 Shields Avenue, Davis, CA [DMR-0844115]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [844115] Funding Source: National Science Foundation
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Using a mesoscale computational model, we probe the release of nanoparticles and linear macromolecules from hollow microgel capsules that swell and deswell in response to external stimuli. Our simulations reveal that responsive microcapsules can be effectively utilized for steady and pulsatile release of encapsulated solutes. Swollen gel capsules allow steady, diffusive release of nanoparticles and polymer chains, whereas gel deswelling causes burst-like discharge of solutes driven by an outward flow of the solvent enclosed within a shrinking capsule. We demonstrate that this hydrodynamic release can be regulated by introducing rigid microscopic rods in the capsule interior. Thus, our findings disclose an efficient approach for controlled release from stimuli-responsive microcarriers that could be useful for designing advanced drug delivery systems.
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