title: Petal effect: a superhydrophobic state with high adhesive force.
abstract: Hierarchical micropapillae and nanofolds are known to exist on the petals' surfaces of red roses. These micro- and nanostructures provide a sufficient roughness for superhydrophobicity and yet at the same time a high adhesive force with water. A water droplet on the surface of the petal appears spherical in shape, which cannot roll off even when the petal is turned upside down. We define this phenomenon as the "petal effect" as compared with the popular "lotus effect". Artificial fabrication of biomimic polymer films, with well-defined nanoembossed structures obtained by duplicating the petal's surface, indicates that the superhydrophobic surface and the adhesive petal are in Cassie impregnating wetting state.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, P. R. China. fl@mail.tsinghua.edu.cn
authors.forename: Lin
authors.initials: L
authors.lastname: Feng
authors.forename: Yanan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jinming
authors.initials: J
authors.lastname: Xi
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.forename: Nü
authors.initials: N
authors.lastname: Wang
authors.forename: Fan
authors.initials: F
authors.lastname: Xia
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
mesh_terms: D000268:Adhesiveness; D035264:Flowers / Q000737:chemistry* / Q000648:ultrastructure; D006368:Helianthus / Q000737:chemistry / Q000648:ultrastructure; D057927:Hydrophobic and Hydrophilic Interactions; D027762:Lilium / Q000737:chemistry / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water