Journal
ACS NANO
Volume 9, Issue 11, Pages 10887-10895Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03905
Keywords
caged microcapsules; cellulose nanocrystals; particle transport; particle loading
Categories
Funding
- National Science Foundation [CBET-1402712]
- Air Force Office for Scientific Research [FA9550-14-1-0015]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1402712] Funding Source: National Science Foundation
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We demonstrate the fabrication of highly open spherical cages with large through pores using high aspect ratio cellulose nanocrystals with haystack' shell morphology. In contrast to traditional ultrathin shell polymer microcapsules with random porous morphology and pore sizes below 10 nm with limited molecular permeability of individual macromolecules, the resilient cage-like microcapsules show a remarkable open network morphology that facilitates across-shell transport of large solid particles with a diameter from 30 to 100 nm. Moreover, the transport properties of solid nanoparticles through these shells can be pH-triggered without disassembly of these shells. Such behavior allows for the controlled loading and unloading of solid nanoparticles with much larger dimensions than molecular objects reported for conventional polymeric microcapsules.
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