INFRA-RED spectroscopy has shown that only a small proportion of the external OH groups of kaolinite contribute to the bonding mechanism between layers and also that these interlayer hydrogen bonds are very weak (absorption bands above 3,600 cm−1) (ref. 1).
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SERRATOSA, J., VIÑAS, J. Infra-red Investigation of the OH Bonds in Chlorites. Nature 202, 999 (1964). https://doi.org/10.1038/202999a0
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