Montmorillonite, a typical clay mineral, significantly influences the macroscopic deformation and fracture of soft rocks through water absorption-induced swelling and mechanical behavior at …
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The shale inhibitor TGA mechanism is mainly to inhibit the hydration expansion of sodium montmorillonite by inhibiting interlayer hydration. The amine group of the inhibitor molecule is dissociated into ammonium cations after hydration and …
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Furthermore, the hydration and expansion of VMT may also give rise to complications such as geotechnical instability [13]. ... Influence of inorganic and organic salts …
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(1) The laboratory results showed that increasing the temperature significantly affected water molecules, and the particle aggregates exhibited inhomogeneous thermal …
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The larger hydration energy of Ca 2+ ions relative to Na + ions promotes increased water coordination numbers and more pronounced association of water molecules with Ca 2+ …
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Most researchers believe that montmorillonite with stronger hydration ability layer cations (such as Na +, Li +) has higher expansion and hydrophilicity [21,22,23,24]. On the …
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They explored the effect of the degree of the hydration of divalent interlayer cations (Mg 2+ /Ca 2+ /Sr 2+ /Ba 2+) on the structure expansion of the interlayer space of …
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The hydration expansion of montmorillonite is inhibited by 2,3-epoxypropyltrimethylammonium chloride (NW-1 +).The adsorption behaviors of NW-1 + on Na …
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firm whether montmorillonite hydration expansion is restrained or not. 1.2.2 Montmorillonite's single static sedimentation experiment of different electrolyte solutions Take dry 2.5 g …
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The hydration radius of these ions can exceed 0.3 nm [44], contributing further to the hydration expansion of MMT [45]. As the hydration level increases, the interlayer spacing …
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A common approach to studying the distinct hydration states of the montmorillonite swelling clays is to vary the conditions of relative humidity and to monitor interlayer expansion …
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With the increase in temperature, the inhibition of the cations on montmorillonite hydration is weakened, while the effect of pressure is opposite. ... Therefore, fully understanding the mechanism of clay hydration expansion and …
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Montmorillonite (Mt) is a ubiquitous swelling clay mineral that exists in sedimentary rocks, surface sediments and soils ... Therefore, after hydration and expansion, the Mt …
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Borehole instability is one of the most complicated technical problems in oil and gas exploration and development.The hydration and expansion of clay minerals is the critical factor causing …
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The hydration expansion of montmorillonite is ma inly affected by the surface . hydration force, osmotic hydration force and capill ary force. In addition, the water adsorbed by .
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Specific features of the hydration process of the sodium form of montmorillonite were investigated by the DFT method in [28]. It has been found that the energies of water …
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By comparing and analyzing the data in Table 1, it can be found that under different hydration conditions, each inhibitor has a different degree of inhibition of sodium …
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The interlayer cations in montmorillonite gradually undergo hydration with water molecules entering the layers, diminishing the interaction forces that contact the cations with the surfaces …
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In this study, the adsorption behavior and hydration mechanism of water molecules on the surface of four cationic forms of montmorillonites (Li Mt, Na Mt, K Mt, and Ca Mt) were …
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The RH of hydration transition strongly depends on the nature of the clay, in particular the layer charge and its localization in the mineral layers (surface vs. center), and on the nature of the …
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In fact, the hydration of montmorillonite is more intense compared with illite, that is, the presence of montmorillonite has a more serious effect on the expansion of clay minerals. 4.4. Effect of Cations on the Hydration of Clay …
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Huang et al. 11 investigated the mechanism of inhibiting the hydration of montmorillonite by small organic amine molecules, and found that formamide has a better …
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With the increase of burial depth and interlayer water content, the volume of sodium montmorillonite increases, while the density decreases correspondingly. The increase of …
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The hydration expansion stress and strain tester, which was developed based on the principle of the fixed-volume method, is used to evaluate the hydration expansion strain …
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Hydration swelling and the interlayer structure properties of Na-montmorillonite were modeled with the energy minimizing and molecular dynamics (MD) module of Cerius2.
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Expansion characteristics of organo montmorillonites during the intercalation, aging, drying and rehydration processes: Effect of surfactant/CEC ratio ... Although sydration …
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The expansive clay minerals are mainly montmorillonite (MMT) and vermiculite (VMT), which are known for their interlayer hydration and swelling [8]. Studies on the swelling …
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It is widely recognized that the primary factors contributing to hydration-induced damage in conglomerate reservoirs in the Junggar Basin include montmorillonite water …
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By comparing and analyzing the data in Table 1, it can be found that under different hydration conditions, each inhibitor has a different degree of inhibition of sodium …
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A number of studies have examined the hydration behaviors of montmorillonite with Na + and K +; however, assessments of smectite species other than montmorillonite, the …
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