Patent ID: 8586144

Claim:
A method for forming an anti-reflection coating of alkali-treated silica aerogel on a substrate, comprising: hydrolyzing and polymerizing alkoxysilane in a solvent in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in a solvent in the presence of an acid catalyst to prepare a second acidic sol, mixing said first and second acidic sols, applying the resultant mixed sol to said substrate, drying it, treating the resultant silica aerogel coating with an alkali solution at a temperature of 1-40° C. for 0.1-10 hours, and drying it at a temperature of 100-200° C. for 15 minutes to 24 hours.