Preparation and properties of superhydrophilic inorganic coatings based on photocatalytic TiO2
[Introduction]Superhydrophilic coatings have self-cleaning,antifogging,and anti-fouling properties,but their transparency is often less than ideal when applied to glass.[Method]A TiO2 sol was synthesized with titanium butoxide as the precursor and acetylacetone as the inhibitor in the solvent composed of anhydrous ethanol and deionized water under the catalysis of nitric acid,and then coated on glass slide and subjected to calcination,forming a transparent coating with superhydrophilicity.The particle size of the sol,and the surface morphology,water contact angle,transmittance,and thermal stability of the coating were examined.[Result]The hydrophilic TiO2 coating featured a water contact angle of 8.0° and a mass loss of only 8%after being heated to 800 °C.The transmittance of the coating in a wavelength range of 400 to 700 nm was only 4 percentage points lower than that of the bare glass.[Conclusion]The coating exhibits excellent hydrophilicity and antifogging performance.
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