Optimal Optical Properties–Hardness Ratio of Antirefl ection
Coating Produced from a Silica Sol
with Hexadecyltrimethylammonium Bromide on Silicate Glass
B. B. Troitskiia,*, A. A. Loktevaa, M. A. Novikovaa, T. I. Lopatinaa, and I. L. Fedyushkina
a Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Nizhny Novgorod, 603950 Russia
*e-mail: Troitski@iomc.ras.ru
Received December 3, 2019; revised December 6, 2019; accepted December 6, 2019
Abstract—The eff ect of the hexadecyltrimethylammonium bromide concentration in the silica sol, which is used
to obtain antirefl ection coatings over silicate glass, on the light transmission of coated glass and the hardness of the
coatings was studied. An increase in the concentration of hexadecyltrimethylammonium bromide in the sol from
1.37 × 10–2 to 5.20 × 10–2 M increases the maximum light transmission of glass with an antirefl ective coating from
94.7 to 99.0%, and minimum, from 84.7 to 93.6%, reduces the refractive index of the coating from 1.43 up to 1.27.
The 3H–4H coating hardness acceptable for practice can be achieved provided that the maximum light transmission
of glass with a single-layer double-sided coating is ≤96.0–97.0%, the refractive index of the antirefl ection coating
is ≥1.35–1.36, and the maximum volume content of nanopores in the coating is not more than 20.0–23.0 vol % .
Keywords: silica sol; hexadecyltrimethylammonium bromide; silicate glass; antirefl ection coatings; light transmission; hardness
DOI: 10.1134/S1070427220020111