Nanosized γ-Al2O3 protective film for fluorescent lamps

Nanosized γ-Al2O3 particles were prepared by the sol–gel method with aluminum ion hydrolysis control performed by nitric acid. The as-prepared particles were mixed with deionized-water and stabilizer, and cycled in a high speed sand mill to form a stable γ-Al2O3 suspended slurry, which was then coated on the surface of the glass substrate to form a γ-Al2O3 protective film. Observations of SEM and visible transmission spectra show that a well-dispersed γ-Al2O3 slurry could be obtained after three-cycle grinding suitable to coat fluorescent lamp glass with a dense and uniform film of visible light transmission up to 95%.