Journal
LANGMUIR
Volume 26, Issue 14, Pages 12377-12382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la101909e
Keywords
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Funding
- CAS [2007CB607601]
- NSFC [50835009]
- State key research project [2008ZX05001-002]
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Two stimuli-responsive polymers, poly(N-isopropylacrylamide) (PNIPAM) and poly(dimethylamino)ethyl methacrylate (PDMAEMA), were grafted from initiator-modified anodized alumina substrates with irregular micro/nanoscale surface topography. The resulting polymer-coated surfaces exhibited highly unusual wettability properties, as spherical water/acid/alkali/salt droplets could be reversibly switched between pinned states and rolling states due to the changes of temperature, pH, and electrolytes. The key to this effect is the combination of a mixed monolayer which provides initiator points for brush growth as well as a permanently hydrophobic substrate and a surface roughness.
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