RbxCsyWO3 based superhydrophobic transparent thermal insulation film for energy saving

Superhydrophobic transparent insulation film has attracted more attentions in the field of energy-saving glass due to its excellent near-infrared (NIR) shielding property and good self-cleaning performance. In this study, Rb+, Cs+ co-doped tungsten bronze powders were synthesized through a solvothermal reaction, and the superhydrophobic transparent thermal insulation film was constructed on glass. Results show that the strategy of Rb+, Cs+ co-doping can improve the NIR shielding property by incorporating more alkali metal ions into the hexagonal channel and can increase the content of W5+. When n(Rb)/n(Cs)=2, the film exhibits the best NIR shielding performance, with a visible transmittance of 55.6% and an NIR shielding rate of 94.6%. The superhydrophobic tungsten bronze film was successfully prepared with a water contact angle of 163.3±4.1°. The film also exhibits good chemical stability and water impact resistance, with a visible light transmittance of 62.7%, and an NIR shielding rate of 92.9%. The maximum temperature difference in insulation between the uncoated glass and the glass coated with R2WO's PVA/PDMS/SiO2-2 film is 8.9℃ under the irradiation of a tungsten lamp. In conclusion, R2WO's PVA/PDMS/SiO2-2 film, which exhibits excellent heat insulation and good self-cleaning ability, holds great potential for application in the energy-saving glass industry.