Schematic diagrams of the wetting model of the mesh film coated by ZnO nanorod arrays. (a)The coated mesh is impermeable to water, and (b) the coated shows good oil permeability. O is the center of the spherical cap of the meniscus; O1 and O2 are the cross section center of the mesh.
Li et al. Nanoscale Research Letters 2013 8:183 doi:10.1186/1556-276X-8-183