Study on the evaporation characteristics of Ag@Fe3O4 nanoparticle film interface

In order to collect solar energy into vapor more efficiently, Ag@Fe3O4 nanoparticles with good photothermal properties were prepared in this study, and nanoparticle films were prepared by vacuum filtration of nanofluids to load nanoparticles on filter membrane, which exhibit good evaporation performance. The effects of fluid depth, nanoparticle loading surface density and light intensity on the evaporation performance were investigated. The experiments showed that the evaporation performance is the best at a light intensity of 2 sun, a surface density of 1.0 g/m2 and a fluid depth of 30 mm (evaporation efficiency of 0.599 and heat efficiency of 0.824). In addition, the surface density is not conducive to the increase of water temperature when it exceeds a certain range. The increase of nanoparticle film surface density is mainly beneficial to evaporation rather than heat storage.