1. Detailed descriptions of sol-gel inorganic materials and processes can be found in two comprehensive handbooks: 1. Handbook of sol-gel science and technology, ed. by Sumio Sakka. Kluwer Academic Publishing. 2. The sol-gel handbook, ed. by David Levy and Marcos Zayat. Wiley-VCH, 2015, and the “classic” textbook of Jeffrey Brinker and George Scherer “Sol-Gel Science”, Academic Press 1990
2. Orgaz F, Rawson H (1986) Characterization of various stages of the sol-gel process. J Non-Cryst Solids 82:57–68
3. Scherer GW (1988) Aging and drying of gels. J Non-Crystal Solids 100:77–92
4. Brinker CJ (1994) Sol-gel processing of silica, the colloid chemistry of silica, chapter 18. Adv Chem 234:361–401
5. Turova NY, Turevskaya EP, Kessler VG, Yanovskaya MI (2002) The chemistry of metal alkoxides. Kluwer Academic Publishers, Dordrecht