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Volume 35 Issue 12
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LIU Xiang-jun, LIU Kun, GOU Shao-hua, YE Zhong-bin, LIANG Li-xi, ZHU Zhe-xian. Influencing factors for interlayer expansion of Na-montmorillonite[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(12): 2342-2345.
Citation: LIU Xiang-jun, LIU Kun, GOU Shao-hua, YE Zhong-bin, LIANG Li-xi, ZHU Zhe-xian. Influencing factors for interlayer expansion of Na-montmorillonite[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(12): 2342-2345.
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Influencing factors for interlayer expansion of Na-montmorillonite

  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China

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  • Received Date: April 09, 2013
  • Published Date: November 30, 2013
    Graphical Abstract
    • Abstract
  • The swelling characteristics of interlayer spacing (d001) of Na-montmorillonite (Na-MMT) are analyzed in different polymer and electrolyte solutions. It is found that due to its huge volume in aqueous solution, the polymer molecule can not inserted into the interlayer of Na-MMT and hardly has remarkable effect on the expansion of the interlayer spacing; on the other hand, the electrolytes, especially KCl, can inhibit the expansion of the interlayer spacing. In addition, the inhibition ability varies with the category and concentration of the cations. Further studies show that the process of interlayer spacing expansion is accompanied with the ion-exchange between the MMT and the solution, and that the ion-exchange capacity exhibits certain correlation with the change of interlayer spacing. The interaction between the cations and the internal space of the crystal layer is the key factor to influence the expansion of interlayer spacing, and interlayer spacing is finally determined based on the concentration, ion hydration radius and the ability to attract crystal layer of the cationic.
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    • References (12)
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