Fig. 1. Synthesis and characterization of the evaporator. (a) Synthesis of the polymer. (b) SEM images of the foam evaporator under low and high magnification. (c) Photographs of a cylindrical evaporator (d = 10 mm and h = 10 mm) supporting a weight of 500 g (the weight of the cylinder is about 25 mg). (d) Compressive stress–strain curves of the foam. (e) An optical image of the foam evaporator self-floating at the air–water interface. (f) The water-wetting performance of the foam evaporator.