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Antireflective (AR), self-cleaning, and anti-fogging bilayer coatings were prepared using a new structure and design concept. The bottom layer has a lower refractive index of 1.07–1.13 and was obtained from hollow silica (HSiO2) nanoparticles, while the top layer has a high refractive index but good photocatalytic activity via titania (TiO2) nanoparticles. The two layers give rise to a reasonable...
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