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In Situ Reversible Tuning from Pinned to Roll-Down Superhydrophobic States on a Thermal-Responsive Shape Memory Polymer by a Silver Nanowire Film
journal contribution
posted on 2020-03-05, 18:09 authored by Chuanzong Li, Yunlong Jiao, Xiaodong Lv, Sizhu Wu, Chao Chen, Yiyuan Zhang, Jiawen Li, Yanlei Hu, Dong Wu, Jiaru ChuShape
memory polymer (SMP) surfaces with tunable wettability have attracted
extensive attention due to their widespread applications. However,
there have been rare reports on in situ tuning wettability with SMP
materials. In this paper, we reported a kind of distinct superhydrophobic
SMP microconed surface on the silver nanowire (AgNW) film to achieve
in situ reversible transition between pinned and roll-down states.
The mechanism is taking advantage of the in situ heating functionality
of the silver nanowire film by voltage, which provides the transition
energy for SMP to achieve the fixation and recovery of temporary shape.
It is noteworthy that the reversible transition could be repeated
many times (>100 cycles), and we quantitatively investigate the
shape memory ability of microcones with varied height and space under
different applied voltages. These results show that the tilted microcones
could recover its original upright state under a small voltage (4–11
V) in a short time, and the shortest recovery time is about 0.5 min
under an applied voltage of ∼10 V. Finally, we utilize SMP
microcone arrays with tunable wettability to realize lossless droplet
transportation, and the tilted microconed surface also achieves liquid
unidirectional transport due to its anisotropic water adhesion force.
The robust microconed SMP surface with reversible morphology transitions
will have far-ranging applications including droplet manipulation,
reprogrammable fog harvesting, and so on.
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voltageanisotropic water adhesion forcetunable wettabilitySitu Reversible Tuningsilver nanowire filmSMP microcone arraysshape memory abilityThermal-Responsive Shape Memory PolymerSilver Nanowire Film Shape memory polymerreprogrammable fog harvestingtransitionmicroconed SMP surfacesuperhydrophobic SMP microconed surfacelossless droplet transportationRoll-Down Superhydrophobic States
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