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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


GARDOLINSKI, José Eduardo; MARTINS FILHO, Harley Paiva  and  WYPYCH, Fernando. Thermal behavior of hydrated kaolinite. Quím. Nova [online]. 2003, vol.26, n.1, pp.30-35. ISSN 0100-4042.

Well-ordered kaolinite from the Brazilian Amazon Region (State of Pará) was initially reacted at 60 °C with a water dimethylsulfoxide mixture. After washing and characterisation, the resulting material was washed several times with methanol and in the final step with water. The water molecules displace the previously dimethylsulfoxide intercalated molecules and two different hydrated kaolinites were obtained. An unstable phase characterized by an interplanar basal distance of 0,996 nm that after drying collapse to the stable 0,844 nm hydrated kaolinite. The dehydration of the sample to disordered kaolinite was accompanied by Powder X-ray Diffractometry, thermal analysis (simultaneous TG and DSC) and FTIR spectroscopy.

Keywords : kaolinite; clay minerals; intercalation compounds.

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