Comparison Study on the Effect of Interlayer Hydration and Solvation on Montmorillonite Delamination

Li, Hongliang; Song, Shaoxian; Zhao, Yunliang; Nahmad, Yuri; Chen, Tianxing

doi:10.1007/s11837-016-2162-0

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…With the low cost, nontoxicity, high specific surface area, and electrical anisotropy, MMT is suitable for use as a raw materials for new nanocomposites in food, medicine, cosmetics, and healthcare. − The physical and mechanical properties of polymer/MMT nanocomposites will be influenced by the properties of MMT nanosheets, especially the aspect ratio. MMT nanosheets with different aspect ratios have different applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Montmorillonite Nanosheets through Freezing/Thawing and Ultrasonic Exfoliation

et al. 2019

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The exfoliation of layered montmorillonite (MMT) into mono-or few-layer sheets is of significance for both fundamental studies and potential applications. In this report, exfoliated MMT nanosheets with different aspect ratios have been prepared via a new freezing/thawing−ultrasonic exfoliation method. Freezing/thawing processing can exfoliate MMT tactoids with low efficiency while virtually retaining the original lateral size. The ultrasonic method has better exfoliation efficiency but tends to damage the nanosheets. By combining them and reasonably controlling the cycle index of freezing/thawing and ultrasonic power, the MMT nanosheets with different aspect ratios have been prepared efficiently. Such a unique exfoliation method has broad applicability for layered materials to produce monolayer nanosheets on a large scale.

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Section: Introductionmentioning

confidence: 99%

Preparation of Montmorillonite Nanosheets through Freezing/Thawing and Ultrasonic Exfoliation

et al. 2019

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“…At present, molecular simulation technology has been successfully used to study the hydration characteristics of montmorillonite. Marry and Mignon studied the behavioral characteristics of different cations (Li + , Na + , and K + ) in the hydration process of montmorillonite by methods of MC and MD simulation, and found that as the water content between the smectite layers increased, Li + and Na + were easily separated from the montmorillonite interlayer, while K + moved to the surface of the siloxane tetrahedron and was bound to the surface [17,18,19]. Rahromostaqim compared the hydration and expansion properties of illite-montmorillonite (I-MMT) and Na-montmorillonite using molecular dynamics simulation, and found that at low CO 2 concentrations in Na-MMT, which has its layers’ charge concentrated in its octahedral sheet, weak ion-surface interactions result in fully hydrated ions and, therefore, more extensive swelling than in I-MMT [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Layer Charge Density on Hydration Properties of Montmorillonite: Molecular Dynamics Simulation and Experimental Study

Qiu

et al. 2019

IJMS

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Four kinds of Ca-montmorillonite with different layer charge density were used to study the effect of charge density on their hydration properties by molecular dynamics simulation and experiments. The research results of Z-density distribution of water molecules, Hw (hydrogen in water molecules), and Ca in the interlayer of montmorillonite show that the hydration properties of montmorillonite are closely related to its layer charge density. If the charge density is low, the water molecules in the interlayers are mainly concentrated on the sides of the central axis about –1.3 Å and 1.5 Å. As the charge density increases from 0.38semi-cell to 0.69semi-cell, the water molecules are distributed −2.5 Å and 2.4 Å away from the siloxane surface (Si-O), the concentration of water molecules near the central axis decreases, and at the same time, Ca2+ appears to gradually shift from the vicinity of the central axis to the Si-O surface on both sides in the montmorillonite layer. The simulation results of the radial distribution function (RDF) of the Ca-Hw, Ca-Ow (oxygen in water molecules), and Ca-Ot (the oxygen in the tetrahedron) show that the Ca2+ and Ow are more tightly packed together than that of Hw; with the increase of the charge density, due to the fact that the negative charge sites on the Si-O surface increase, under the action of electrostatic attraction, some of the Ca2+ are pulled towards the Si-O surface, which is more obvious when the layer charge density of the montmorillonite is higher. The results of the RDF of the Ot-Hw show that with the increase of charge density, the number of hydrogen bonds formed by Ot and Hw in the interlayers increase, and under the action of hydrogen bonding force, the water molecules near the central axis are pulled towards the two sides of Si-O surface. As a result, the arrangement of water molecules is more compact, and the structure is obvious. Correspondingly, the self-diffusion coefficient shows that the higher the layer charge density, the lower the self-diffusion coefficient of water molecules in interlayers is and the worse the hydration performance of montmorillonite. The experimental results of the experiments fit well with the above simulation results.

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Correlation between surface charge and hydration on mineral surfaces in aqueous solutions: A critical review

Jia

et al. 2020

Int J Miner Metall Mater

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Comparison Study on the Effect of Interlayer Hydration and Solvation on Montmorillonite Delamination

Cited by 7 publications

References 26 publications

Preparation of Montmorillonite Nanosheets through Freezing/Thawing and Ultrasonic Exfoliation

Preparation of Montmorillonite Nanosheets through Freezing/Thawing and Ultrasonic Exfoliation

Effect of Layer Charge Density on Hydration Properties of Montmorillonite: Molecular Dynamics Simulation and Experimental Study

Correlation between surface charge and hydration on mineral surfaces in aqueous solutions: A critical review

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