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Curvature‐Driven Reversible In Situ Switching Between Pinned and Roll‐Down Superhydrophobic States for Water Droplet Transportation
Author(s) -
Wu Dong,
Wu SiZhu,
Chen QiDai,
Zhang YongLai,
Yao Jia,
Yao Xi,
Niu LiGang,
Wang JiangNan,
Jiang Lei,
Sun HongBo
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201001688
Subject(s) - curvature , materials science , pillar , wetting , adhesion , surface (topology) , in situ , nanotechnology , contact angle , composite material , geometry , mechanical engineering , chemistry , mathematics , engineering , organic chemistry
Precise tuning of surface wettability – by means of curvature‐driven reversible switching from the pinned to the roll‐down superhydrophobic state (see figure) – is reported for for the first time. The adhesion force and sliding behaviors of superhydrophobic poly(dimethylsiloxane) (PDMS) pillar arrays show strong dependence on surface curvature. Alteration of the curvature of the surface allows a water droplet to be easily adjusted from the “ pinned” to the “roll‐down” state, which provides the possibility of precise, in situ control of the movements of water droplets.