Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 48, Pages 33250-33255Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12472
Keywords
Janus; porous; responsive; dealloying; coral microstructure; capillary force
Funding
- NSF of China [51203169, 51233007]
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A Janus porous sphere with a coral-like microstructure is prepared by stepwise dealloying a metallic alloy sphere and sequential modification (for example, using silanes and polymers). Nanoscale coral-like microstructure of the internal skeleton gives remarkable capillary force, thus accelerating the mass transportation. Starting from the outer layer of the sphere, stepwise dealloying can achieve different layers inwardly, thus introducing different composition and performance. As an example, poly(ethylene glycol) poly(N-isopropylacrylamide) (PEG-PNIPAM)- and poly(ethylene glycol) poly(N,N-diethylamino-2-ethylmethacrylate) (PEG-PDEAEMA)-responsive Janus porous spheres can quickly capture oil by simply changing temperature or pH. Similarly, release is also triggered.
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