Abstract
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.
Original language | English |
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Pages (from-to) | 12377-12382 |
Number of pages | 6 |
Journal | Langmuir |
Volume | 26 |
Issue number | 14 |
DOIs | |
State | Published - 20 Jul 2010 |
Externally published | Yes |