Infrared Study of the OH Groups in Expanded Kaolinite

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Abstract
Expansion of kaolinite with potassium acetate and with hydrazine followed by deuteration, shifts the absorption frequency at 3695 cm -1 to lower values, but does not affect the intensity of the 3620-cm -1 absorption band. The band at 3695 cm -1 is correlated predominantly to inner-surface hydroxyls with the dipole at right angles to the basal plane and the band at 3620 cm -1 is related to inner hydroxyls with the dipole inclined toward empty octahedral sites.

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