Solvent, Catalyst, and Precursor: Parameters of Ge(OR)4 Hydrolysis for GeO2 Aerogels Production

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
V. O. Veselova, S. Yu. Kottsov, S. V. Golodukhina, A. A. Piryazev, O. M. Gajtko
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引用次数: 0

Abstract

The parameters of gel synthesis affect the kinetics and mechanism of hydrolysis and condensation processes, thereby determining the three-dimensional porous structure. In this work, the characteristics of germanium dioxide aerogels were investigated depending on the conditions of preparation. Acetonitrile was chosen as the optimal solvent, and hydrochloric acid was chosen as a catalyst. The concentrational ranges of stable gel existence during the hydrolysis of germanium(IV) tetraethoxide and tetraisopropoxide were determined. The effect of the choice of precursor and water content on the textural characteristics of the aerogel was shown. Mesoporous materials with a specific surface area of 50 m2/g with a wide pore size distribution were obtained. The phase composition of the obtained aerogels in all cases corresponded to the hexagonal modification of germanium dioxide.

Abstract Image

溶剂、催化剂和前驱体:Ge(OR)4水解制备GeO2气凝胶的参数
凝胶合成的参数影响水解和缩合过程的动力学和机理,从而决定了三维多孔结构。本文研究了制备条件对二氧化锗气凝胶特性的影响。以乙腈为最佳溶剂,盐酸为催化剂。测定了四乙氧锗和四异丙醇水解过程中稳定凝胶存在的浓度范围。研究了前驱体的选择和水含量对气凝胶结构特性的影响。得到了比表面积为50 m2/g、孔径分布较宽的介孔材料。所得气凝胶的相组成均符合二氧化锗的六方改性。
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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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