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Journal of Sol-Gel Science and Technology

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30.04.2022 | Invited Paper: Fundamentals of sol-gel and hybrid materials processing

Cosolvent-free synthesis of macroporous silica gels and monolithic silica glasses from tetraalkoxysilane–water binary systems: comparison between tetramethoxysilane and tetraethoxysilane

verfasst von: Koichi Kajihara, Mioko Goto

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2022

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Abstract

Cosolvent-free (solventless) acid-catalyzed partial hydrolysis of tetramethoxysilane (TMOS) or tetraethoxysilane (TEOS) followed by neutralization with imidazole (pK_a = 7.0) was employed to form macroporous silica gels via polycondensation-induced phase separation and concurrent gelation. The reactions of TEOS at 20 °C and subsequent drying in air yielded crack-free opaque macroporous xerogels. In contrast, cooling was necessary to derive opaque gels from TMOS, and the resulting xerogels obtained by reactions at 5 °C broke into pieces during drying due to the too small size of the pores. A macroporous silica xerogel prepared from 50 mmol (10.4 g) of TEOS was dried within 30 h in air, and subsequent sintering in a helium atmosphere at 1300 °C yielded a monolithic silica glass. The yield of silica glasses was higher than 99%.

Vorheriger Artikel How elastic moduli affect ambient pressure drying of poly(methylsilsesquioxane) gels

Nächster Artikel Investigation of local structures of silicon oxynitride glasses prepared from aerogels

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Titel: Cosolvent-free synthesis of macroporous silica gels and monolithic silica glasses from tetraalkoxysilane–water binary systems: comparison between tetramethoxysilane and tetraethoxysilane
verfasst von: Koichi Kajihara
Mioko Goto
Publikationsdatum: 30.04.2022
Verlag: Springer US
Erschienen in: Journal of Sol-Gel Science and Technology / Ausgabe 3/2022
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-022-05799-9

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