Journal
CHEMPHYSCHEM
Volume 16, Issue 1, Pages 147-151Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201402795
Keywords
capsules; dyes; pigments; Janus micromotors; microfluidic chip; silicon
Funding
- National Nature Science Foundation of China [91027045, 21273053]
- State Key Lab of Urban Water Resource and Environment in HIT [ESK201302]
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We report a self-propelled Janus silica micromotor as a motion-based analytical method for achieving fast target separation of polyelectrolyte microcapsules, enriching different charged organics with low molecular weights in water. The self-propelled Janus silica micromotor catalytically decomposes a hydrogen peroxide fuel and moves along the direction of the catalyst face at a speed of 126.3 ms(-1). Biotin-functionalized Janus micromotors can specifically capture and rapidly transport streptavidin-modified polyelectrolyte multilayer capsules, which could effectively enrich and separate different charged organics in water. The interior of the polyelectrolyte multilayer microcapsules were filled with a strong charged polyelectrolyte, and thus a Donnan equilibrium is favorable between the inner solution within the capsules and the bulk solution to entrap oppositely charged organics in water. The integration of these self-propelled Janus silica micromotors and polyelectrolyte multilayer capsules into a lab-on-chip device that enables the separation and analysis of charged organics could be attractive for a diverse range of applications.
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