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- W2085202852 abstract "Hybrid gels, prepared from mixtures of tetraethyl orthosilicate (TEOS) solution and fumed silica (alkoxide: fumed silica = 1 : 1.25) were examined by FTIR at different stages of drying/densification up to glass formation. Transparent, bubble-free glasses containing low hydroxyl were obtained at up to 1525°C under vacuum, oxygen, carbon tetrachloride and helium atmospheres. Spectroscopic investigations revealed a free, isolated silanol stretching (v1) band at around 3740 cm−1 split into two to three overlapping peaks after heat treatment of the gels at 600–950°C. This phenomenon is suggested to be due to either the presence of two types of isolated silanols (single and geminal) and/or an effect of the hybrid microstructure of the gels with widely varying spatial relationships among SiOH groups, leading to closely related, weak interactions." @default.
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- W2085202852 date "1993-05-01" @default.
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- W2085202852 title "FTIR studies of gel to glass conversion in TEOS-fumed silica-derived gels" @default.
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- W2085202852 doi "https://doi.org/10.1016/0022-3093(93)91259-6" @default.
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