Infrared characteristic bands of highly dispersed silica |
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Authors: | Tsutomu Takamura Hiromi Yoshida Kiyokatsu Inazuka |
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Affiliation: | (1) Present address: Central Research Laboratory, Tokyo Shibaura Electric Co., Ltd., Japan |
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Abstract: | Summary Infrared studies were carried out for several silica modifications. On powdering bulk silica in air, new bands were observed to appear at 3400 cm−1 and 950 cm−1 irrespective of its inner crystallographic structure. In addition to the bands observed for bulk silica, bands were observed for silica gel at the following frequencies: 3400, 1650, 1120, 950, and 870 cm−1. Assignment of these band was made by using a deuteration technique and by preparing a transparent film of silica gel on a rock salt plate from tetramethoxy-silane and water vapor. The band at 3400 cm−1 is νOH of silanol or sorbed water; 1650 cm−1, δOH of sorbed water; 1120 cm−1, δOH of silanol; 950 cm−1,ν SiO of slanol; 870 cm−1, νSiOSi of bridged ≡SiOSi≡ link on the surface. Zusammenfassung Es wurden Infrarot-Untersuchungen an verschiedenen Silica-Modifikationen ausgeführt. Wenn man festes Silica an Luft pulvert, werden neue Banden bei 3400 cm−1 und 950 cm−1 unabh?ngig von der inneren Kristallstruktur beobachtet. Zus?tzlich zu diesen Banden ergeben sich weitere in Silica-Gel bei den Frequenzen 3400, 1650, 1120, 950 und 870 cm−1. Die Zuordnung dieser Banden lie? sich mit Deuterierungs-methode und durch Herstellung transparenter Filme von Silica-Gel auf Steinsalzplatten aus Tetramethoxysilan und Wasserdampf erreichen. Die Bande bei 3400 cm−1 entspricht dem νOH von Silanol oder sorbiertem Wasser. 1650 cm−1 dem δOH von sorbiertem Wasser, 1120 cm−1 dem δOH von Silanol, 950 cm−1 den δSiO vom Silanol, 870 cm−1 dem νSiOSi der Brückenbindung an der Oberfl?che. The authors wish to express their thanks to Dr.Y. Miura, a chief of this Laboratory, for his encouragement in the course of this study, to Dr.I. Teraoka, a researcher of this Laboratory, for the preparation of sample and to Dr.R. Soda of the National Institute of Industrial Health, for his valuable discussions. |
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