The effect of pressure on the intercalation of an ordered kaolinite

Ray L. Frost, J. Theo Kloprogge, Thu Ha Thi Tran, Janos Kristof

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Intercalation of an ordered kaolinite with potassium acetate (KCH3COO) under a pressure of 20 bars and 220 °C, induced new Raman bands at 3590, 3603, and 3609 cm-1 in addition to the normal kaolinite bands. These bands are attributed to the inner surface hydroxyls hydrogen bonded to the acetate. It is proposed that the intercalation under 20 bars pressure at 220 °C caused the differentiation of the inner surface hydroxyl groups, resulting in the appearance of these additional bands. Diffuse reflectance infrared spectra of the potassium acetate intercalated kaolinite that was formed at 20 bars and at 220 °C showed new bands at 3595 and 3605 cm-1. Upon formation of the intercalate at 2 bars and at 120 °C additional infrared (IR) bands were found at 3592, 3600, and 3606 cm-1. These IR bands correspond well with the observed Raman spectra. It is proposed that the effect of intercalation of the highly ordered kaolinite under pressure caused the kaolinite to become disordered and this disordering was dependent on the temperature of intercalation. It is suggested that when pressure is applied to the kaolinite crystal in the presence of an intercalating agent, the hydrogen bonds between adjacent layers are broken to create space for the intercalating agent between the layers. A direct result is that the order of the kaolinite crystals shows a decrease resulting in more defect structures. This is evidenced by the additional spectroscopic bands in both the Raman and IR spectra.

Original languageEnglish
Pages (from-to)1182-1187
Number of pages6
JournalAmerican Mineralogist
Volume83
Issue number11-12 PART 1
Publication statusPublished - 1998

Fingerprint

Kaolin
kaolinite
Intercalation
intercalation
Potassium Acetate
Intercalating Agents
Infrared radiation
acetate
acetates
Hydroxyl Radical
potassium
hydrogen
crystal
infrared spectra
Crystals
Raman spectra
Defect structures
effect
defect
Raman scattering

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Frost, R. L., Kloprogge, J. T., Tran, T. H. T., & Kristof, J. (1998). The effect of pressure on the intercalation of an ordered kaolinite. American Mineralogist, 83(11-12 PART 1), 1182-1187.

The effect of pressure on the intercalation of an ordered kaolinite. / Frost, Ray L.; Kloprogge, J. Theo; Tran, Thu Ha Thi; Kristof, Janos.

In: American Mineralogist, Vol. 83, No. 11-12 PART 1, 1998, p. 1182-1187.

Research output: Contribution to journalArticle

Frost, RL, Kloprogge, JT, Tran, THT & Kristof, J 1998, 'The effect of pressure on the intercalation of an ordered kaolinite', American Mineralogist, vol. 83, no. 11-12 PART 1, pp. 1182-1187.
Frost RL, Kloprogge JT, Tran THT, Kristof J. The effect of pressure on the intercalation of an ordered kaolinite. American Mineralogist. 1998;83(11-12 PART 1):1182-1187.
Frost, Ray L. ; Kloprogge, J. Theo ; Tran, Thu Ha Thi ; Kristof, Janos. / The effect of pressure on the intercalation of an ordered kaolinite. In: American Mineralogist. 1998 ; Vol. 83, No. 11-12 PART 1. pp. 1182-1187.
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