Abstract
Smart control of surface wettability can be obtained by adjusting surface chemistry or regulating surface microstructure, however, coordinated regulation of the two factors on the same surface is still limited. Here, we report a new shape memory composited film consist of a hierarchical pillared polyurethane surface and shape memory polyurethane-cellulose substrate. Reversible switching among multiple wetting states between superhydrophobicity and superhydrophilicity can be realized by synergistic regulation of surface microstructure based on stretching-recovery shape memory effect and surface chemical composition based on O2 plasma-heating. The mild and excellent water-responsive shape memory ability of substrate enables surface microstructure and corresponding wetting to fix at desirable states without keeping continuous external force or stimuli, which is superior to elastomer substrate, responsive molecule modification, or traditional temperature/light triggered shape memory materials. Given the flexibility and versatility, we show its applications in smart platform for creating gradient wettability and patterned micro-reaction.
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