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Polypyrrole Whelk-Like Arrays toward Robust Controlling Manipulation of Organic Droplets Underwater

Polypyrrole Whelk-Like Arrays toward Robust Controlling Manipulation of Organic Droplets Underwater
Ying Zhu, Yunan Li, Lei Jiang, Guozheng Xiao, Zhuang Kong, Chao Teng, Shuangbao Wang, Guangyuan Ren, Xianyong Lu
Whelk-like polypyrrole (PPy) arrays film is successfully prepared by electropolymerization of pyrrole in the presence of low-surface-energy tetraethylammonium perfluorooctanesulfonate (TEAPFOS) as dopant. The underwater wettability of PPy whelk-like arrays can be successfully tuned by electrical doping/dedoping of PFOS ions. Interestingly, CCl4 droplets with microliter-size as a representative sample are gathered together to form a larger droplet underwater at the potential of +0.8 V (vs Ag/AgCl), because PPy is in its PFOS-doped states. Note that CCl4 droplet can climb uphill successfully on the inclined whelk-like arrays PPy film under the applied potential of −1.0 V (vs Ag/AgCl), which may be attributed to wettability gradient derived from different oxidation states of PPy induced by electrochemical potential. These results may provide a simple strategy for on-demand manipulation of organic droplets underwater at low voltage. Organic droplets collecting is successfully realized on horizontal polypyrrole (PPy) whelk-like arrays film underwater under +0.8 V. Interestingly, organic droplet can climb uphill on the inclined whelk-like PPy arrays film under the applied electrochemical potential of −1.0 V. The wettability gradient from electrical field gradient is responsible for the driving force of the movement of organic droplet.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701938

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