Water-repellent and water-loving components are
 usually used to prepare superhydrophobic and underwater
 superoleophobic surfaces, respectively. In this work, a facile
 approach for the fabrication of coatings with the opposite
 superwettabilities is presented. Hydrophilic nanoparticles (TiO2,
 SiO2, and Al2O3) and fluorocarbon surfactants were mixed in
 water. The obtained aqueous suspensions were simply dipped,
 brushed, or sprayed onto various substrates, such as fabric,
 sponge, cotton, nickel foam, stainless steel mesh, copper sheet,
 glass, and ceramic. The prepared coatings show super-
 hydrophobic and underwater superoleophobic properties with
 contact angles above 150° and sliding angles below 10°, and they
 exhibit high resistance to liquid impact, sandpaper abrasion, and acid/base treatment. Taking advantage of its unusual
superwettability, the coated fabric can be used for on-demand oil−water separations without a continuous external stimulus.
 The proposed coatings with opposite superwettabilities will demonstrate the complementary advantages in a variety of
interfacial applications.