The monolithic hydrophobic mesoporous alumina aerogels were successfully synthesized by acid–base sol–gel polymerization of aluminium chloride hexahydrate (AlCl 3 ·6H 2 O) in deionized water/alcohol solution (v/v = 3:7). To minimize shrinkage during drying, alumina hydrogels were aged in tetraethylorthosilicate (TEOS)/acetonitrile solution, and modified using trimethylchlorosilane (TMCS)/acetonitrile solution. Properties of the final product were examined by contact angle measurement, FTIR, FESEM, TEM and BET analyses. Surface modification was confirmed by FTIR spectroscopy. It was found that hydrophobic property of the alumina aerogels was affected by the contents of TMCS. When the molar ratio of TMCS to AlCl 3 ·6H 2 O is 0.35, hydrophobic alumina aerogels shows lower bulk density (0.453 g/cm 3 ) and higher surface area (495 m 2 /g) than those of unmodified alumina aerogels (0.933 g/cm 3 , 413 m 2 /g).
All-inorganic lead halide perovskite quantum dots (QDs), featuring high photoluminescence quantum yield, narrow full width at half maximum, and solution processability, show great promise for high-color-purity displays and optoelectronic devices. Their emission peak position and stability are highly dependent on the surface coordination environment, and achieving controllable color tuning while maintaining stability without altering the primary synthetic route remains a critical challenge. Herein, we propose a facile solution-phase post-treatment strategy using TMCS, which can react with the oleate ligands on the CsPbBr3QD surface while providing abundant Cl−ions, thereby leading to partial halide exchange, achieving continuous tuning of the emission wavelength from 499 nm to 473 nm. The appearance of new absorption peaks in the FTIR spectra indicated the successful introduction of TMCS and the in situ generation of HCl, which led to surface etching and passivation. After being heated at 40 °C for 6 h, the TMCS-50 sample retained 39% of its initial photoluminescence intensity, while the pristine CsPbBr3QD sample retained only 8%, demonstrating that TMCS treatment significantly improves the thermal stability of the CsPbBr3QDs.
In this study, hydrophobic silica dry gel (TSA) modified by trimethylchlorosilane (TMCS) was fabricated using liquid sodium silicate and hydrogen peroxide as raw materials through a green and efficient room-temperature drying approach. Subsequently, TSA was uniformly dispersed into a slurry by the aqueous solution of polyvinylpyrrolidone (PVP), which was then distributed into polyvinyl butyral resin (PVB) for the fabrication of TSA/PVP-PVB composite coating. The optical properties, mechanical properties, aging resistance, and heat and insulation properties of the composite coating were regulated by controlling the amount of TSA paste. The experimental results demonstrate that the introduction of TSA enhances the optical properties of the composite coating: The solar reflectance reaches up to more than 50 %, the transmittance of composite coatings within 15 % TSA is higher than 60 % and the haze is higher than 95 %, thereby improving the anti-ultraviolet aging performance (after 120 h aging treatment, its color difference, gloss, water contact angle (WCA) and microstructure remain stable). The tensile strength and fracture strain decreased as the addition amount increased. Meanwhile, the WCA rose from 42.7° (pure PVB) to 95.4° (30 % TSA composite coating). Interestingly, when we placed the 1 mm thick 30 % TSA composite coating on the heating plate for 10 s at 100 ℃, the surface temperature was only approximately 52.5 ℃, and the heat insulation efficiency was close to 50 %. Additionally, the thermal conductivity of the pure PVB coating was 0.211 W/(m·K), and the TSA content was inversely proportional to the thermal conductivity. The thermal conductivity of the 30 % TSA composite coating was reduced to 0.068 W/(m·K). Compared with traditional methods, the composite coating prepared in this study is more environmentally friendly, economical, and energy-saving, and has outstanding building protection performance.
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