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Effect of Water on the Formamide-intercalation of Kaolinite by Ray L Frost; Janos Kristof; Erzsebet Horvath; J.Theo Kloprogge is a Chemistry article available to read on EtoBox.

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The molecular structures of low defect kaolinite completely intercalated with formamide and formamide -water mixtures have been determined using a combination of X-ray diffraction, thermoanalytical techniques, DRIFT and Raman spectroscopy. Expansion of the kaolinite to 10.09 A , was observed with subtle differences whether the kaolinite was expanded with formamide or formamide -water mixtures. Thermal analysis showed that greater amounts of formamide could be intercalated into the kaolinite in the presence of water. New infrared bands were observed for the formamide intercalated kaolinites at 3648, 3630 and 3606 cm -1 . These bands are attributed to the hydroxyl stretching frequencies of the inner surface hydroxyls hydrogen bonded to formamide with water, formamide and interlamellar water. Bands were observed at similar positions in the Raman spectrum. At liquid nitrogen temperature, the 3630 cm -1 Raman band separated into two bands at 3633 and 3625 cm -1 . DRIFT spectra showed the hydroxyl deformation mode at 905 cm -1 . Changes in the molecular structure of the formamide are observed through both the NH stretching vibrations and the amide 1 and 2 bands. Upon intercalation of kao

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Author

Ray L Frost; Janos Kristof; Erzsebet Horvath; J.Theo Kloprogge

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Pergamon Press Ltd.; Elsevier BV (ISSN 1386-1425)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)