Ultraviolet-Durable Superhydrophobic Nanocomposite Thin Films Based on Cobalt Stearate-Coated TiO₂ Nanoparticles Combined with Polymethylhydrosiloxane

摘要

Ultraviolet (UV)-durable superhydrophobic nanocomposite thin films have been successfully fabricated on aluminum substrates by embedding cobalt stearate (CoSA)-coated TiO_(2) nanoparticles in a hydrophobic polymethylhydrosiloxane (PMHS) matrix (PMHS/TiO_(2)@CoSA) using the sol–gel process. When compared to the sharp decrease of water contact angle (WCA) on the superhydrophobic PMHS/TiO_(2) thin films, the PMHS/TiO_(2)@CoSA superhydrophobic thin films exhibited a nearly constant WCA of 160° under continuous UV irradiation for more than 1 month. The designed scheme of the TiO_(2)@CoSA core–shell structure not only increased the hydrophobic properties of the TiO_(2) nanoparticle surface but also confined the photocatalytic efficiency of TiO_(2) nanoparticles. A plausible model has been suggested to explain the UV-durable mechanism of the superhydrophobic nanocomposite thin films based on PMHS/TiO_(2)@CoSA. Furthermore, the elongated lifetime in the exposure of the solar light imparts this superhydrophobic nanocomposite thin film with potential practical applications where UV-resistant properties are emphasized including corrosion-resistant building walls, anti-icing airplanes, self-cleaning vehicles, and so forth.