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Polypyrrole Whelk‐Like Arrays toward Robust Controlling Manipulation of Organic Droplets Underwater
Author(s) -
Lu Xianyong,
Kong Zhuang,
Xiao Guozheng,
Teng Chao,
Li Yunan,
Ren Guangyuan,
Wang Shuangbao,
Zhu Ying,
Jiang Lei
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701938
Subject(s) - polypyrrole , whelk , materials science , wetting , nanotechnology , electrochemistry , dopant , underwater , chemical engineering , doping , pyrrole , optoelectronics , composite material , polymer , chemistry , electrode , organic chemistry , polymerization , ecology , oceanography , engineering , predation , biology , geology
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, CCl 4 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 CCl 4 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.