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Raman microscopy of formamide‐intercalated kaolinites treated by controlled‐rate thermal analysis technology
Author(s) -
Frost Ray L.,
Kristóf János,
Horváth Erzsébet,
Theo Kloprogge J.
Publication year - 2001
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.751
Subject(s) - formamide , raman spectroscopy , kaolinite , adsorption , chemistry , thermal analysis , thermal treatment , molecule , inorganic chemistry , materials science , thermal , organic chemistry , mineralogy , optics , meteorology , physics , composite material
Raman spectroscopy of formamide‐intercalated kaolinites treated using controlled‐rate thermal analysis technology (CRTA), allowing the separation of adsorbed formamide from intercalated formamide in formamide‐intercalated kaolinites, is reported. The Raman spectra of the CRTA‐treated formamide‐intercalated kaolinites are significantly different from those of the intercalated kaolinites, which display a combination of both intercalated and adsorbed formamide. An intense band is observed at 3629 cm −1 , attributed to the inner surface hydroxyls hydrogen bonded to the formamide. Broad bands are observed at 3600 and 3639 cm −1 , assigned to the inner surface hydroxyls, which are hydrogen bonded to the adsorbed water molecules. The hydroxyl‐stretching band of the inner hydroxyl is observed at 3621 cm −1 in the Raman spectra of the CRTA‐treated formamide‐intercalated kaolinites. The results of thermal analysis show that the amount of intercalated formamide between the kaolinite layers is independent of the presence of water. Significant differences are observed in the CO stretching region between the adsorbed and intercalated formamide. Copyright © 2001 John Wiley & Sons, Ltd.