粘土科学

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The basal spacing and state of water between layers of single-ion forms (Na, K, Mg, Ca) of montmorillonite under different humidity conditions were measured by the X-ray diffraction and near infrared spectroscopy. It was observed that the amount of water molecules between the layers of montmorillonite changed according to changes in humidity. Further, the amount of water molecules adsorbed (w) was 10±5% when there was a 1-layer of water molecules, 20±5% in the case of a 2-layer, and approximately 30% in the case of a 3-layer. Moreover, in the 1-layer case, two hydroxyl (OH) groups of each water molecule interacted with the silicate layer, but in the case of a 2-layer, only one OH group interacted. In the case of a 3-layer, there was a mixture of water molecules where only one OH group interacted and water molecules where no OH groups interacted, and had properties close to bulk water. Thus, it was found that the interlayer water of montmorillonite changes the bonding state depending on the water content.

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