Download Citation | Experimental study on slime water flocculation sediment based on the montmorillonite hydration expansion inhibition | Through the montmorillonite settlement experiment in the ...
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Due to its extremely fine particle size, montmorillonite exists in the form of colloidal particles within the drilling fluid, and its dispersibility has a decisive impact on drilling fluid performance (Anderson et al., 2010).Currently, the petroleum extraction has shifted from surface oil to deep oil, where the drilling fluid is subjected to elevated temperatures exceeding 100 °C, …
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DOI: 10.1016/j.chemphys.2024.112563 Corpus ID: 274490649; Molecular dynamics simulation of hydration expansion characteristics of Na-vermiculite @article{Xu2024MolecularDS, title={Molecular dynamics simulation of hydration expansion characteristics of Na-vermiculite}, author={Tao Xu and Li Hu and Wenhua Zha and Xiaohu Liu and Rengui Huang and Weixin …
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Hydration of the <1 μm size fraction of SWy-1 source clay (low-charge montmorillonite) was studied by modeling of X-ray diffraction (XRD) patterns recorded under controlled relative humidity (RH ...
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In this study, the differences in the absorbed water in the montmorillonite, illite, mudstone, and shale were determined separately. The TGA was performed under an argon atmosphere with a heating rate of 10 °C/min (TGA550, American Ta Instrument Co., Ltd.). ... This was likely caused by hydration expansion and dispersion of clay minerals in ...
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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 of MMT expands, reaching 1.25 nm, 1.53 nm, 1.85 nm, and 2.10 nm for one, two, three, and four layers of water molecules, respectively [46]. This expansion weakens the ...
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In order to further study the influence of layer charge density of montmorillonite on its hydration characteristics at the molecular and atomic level, molecular simulation has been widely used in the study of the hydration characteristics of montmorillonite. ... colloidal value and expansion capacity of montmorillonite suspension, and the worse ...
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The phenomenon of rock structure disintegration caused by the hydration of clay minerals is closely related to engineering safety problems such as slope landslide, tunnel collapse and borehole collapse. In order to reveal the hydration mechanism of sodium montmorillonite under deep and complex burial conditions, molecular dynamics simulations on the hydration process …
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The short-range hydration repulsion plays an irrespective role in the interaction of hydrophilic particles in water. Currently, it is emphasized in many reports, although the interaction force in colloid science has been explained by Derjaguin-Landau-Verway-Overbeek (DLVO) theory, in which the inter-particle force of a colloidal system consists of two components, …
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The mechanism analysis shows that metal cations compress the electric double layer on the surface of montmorillonite, thus inhibit the hydration of montmorillonite, and are conducive to the agglomeration and sedimentation of montmorillonite. ... LIU W L, WANG D H, et al. Effect of hydration expansion inhibition of montmorillonite on sludgy ...
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Montmorillonite and its nanosheets possess unique layered structure and excellent physical/chemical properties. ... [23]. Due to the hydration expansion, MMT can be exfoliated into single-layer or few-layer MMTNS [24]. The exfoliated MMTNS have fully exposed adsorption sites, enhanced charge/functional group anisotropy on the edges and surfaces ...
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The hydration expansion of clay minerals in shale is an important factor affecting the sidewall stability of shale gas well. The montmorillonite is the main constituent of clay minerals, and its hydration mechanism is very important to solve the problem of borehole wall instability in shale gas well. In order to further explore the hydration mechanism of the montmorillonite under high ...
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The hydration characteristics of shale are closely related to the composition of clay minerals, the shale with high illite content is not susceptible to hydration and thus has limited room for pore structure improvement; the shale with high montmorillonite is susceptible to hydration expansion and thus has higher potential of pore structure ...
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In this experimental work, FTIR and Raman investigations on montmorillonite water mixtures as a function of time are carried out in order to follow the montmorillonite dehydration process, as …
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This analysis indicates that for lattice expansions of 3 or 4A from the dehydrated contracted state, the force between montmorillonite lattice layers is substantially constant; but …
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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 dehydration behaviors of smectites, and NH 4 +-saturated smectites have been limited. Most homo-ionized montmorillonite exhibits common hydration behavior (Sato et al., 1992 ...
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The reason for the expansion of Sr-montmorillonite, as in the presence of other cations, can be conditionally divided into two: expansion of the interlayer space under the action of the Sr 2+ hydration shell, and expansion due to the entry of a certain amount of water molecules to fill the remaining interlayer volume [53]. Comparison of Mg-, ...
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This phenomenon is known as hydration and involves the electrostatic forces exerted by interlayer ions and hydrogen bonds formed between water molecules and the OH group on the MMT 010 surface . The expansion and contraction of MMT result in the development of existing cracks (pores) or the creation of new cracks, which may initiate the ...
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Swelling clays are known to exhibit crystalline swelling at the layer scale ( ∼ nm): X-Ray Diffraction (XRD) identifies discrete jumps in inter-layer spacing upon change in relative humidity (RH) corresponding to the thickness of a water layer. Continuum theories are not adapted to describe systems at the scale of a few water molecules, and much effort has been …
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The swelling of smectite clays is the main reason for this hydration expansion in mudstones. It is generally recognized that illite and illite–smectite mixed layer clays are both poor swellable ...
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The expansion from 10-12.4 A occurs at progressively lower relative humidities for smaller size fractions in the same way as the expansion from 12.4-15.5 A. The gradation from high resistance to expansion in the coarse fractions to low resistance to expansion in …
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The hydration expansion of clay minerals in shale is an important factor affecting the sidewall stability of shale gas well. The montmorillonite is the main constituent of clay minerals, and its hydration mechanism is very important to solve the problem of borehole wall instability in shale gas well. In order to further explore the hydration mechanism of the montmorillonite under high ...
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The simulations reproduced the swelling pattern of a natural montmorillonite, suggesting a mechanism of its hydration different from that of the homoionic montmorillonite. We also found that the differences in size and hydration energy of Mg 2 + and Na + ions have strong implications for the structure and the internal energy of interlayer 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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Montmorillonite (Mt) expansion and swelling are key factors determining the barrier performance of bentonite in trans-uranic (TRU) and high-level radioactive waste disposal.
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When exposed to water vapor, water, or some non‐aqueous solvents, montmorillonitic clays display expansion of their lattices. Assuming that the expansion on hydration is a uni‐dimensional swelling phenomenon, a thermodynamic analysis has been made which furnishes quantitative evaluation of interplanar forces. This analysis indicates that for lattice expansions of 3 or 4A …
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Molecular dynamics simulations have been performed to investigate the swelling properties, hydration behaviors, and mobility of the interlayer species of (Na x, Ca y)-montmorillonites with different water contents.
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The evolution of the basal spacing, d(001), of homoionic montmorillonite during hydration is shown as a function of relative humidity (RH) at 50 °C in Fig. 2 (a) and is based on the results of Morodome and Kawamura, 2009, Morodome and Kawamura, 2011. For monovalent Na case, the basal spacing changed in a stepwise manner: ~10 Å for the dry ...
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For research into the performance of montmorillonite gel, predecessors have done much work. For example, Sun Hongjuan et al. [10] studied the effect of interlayer metal cations (monovalent and divalent cations) on the structure and hydration expansion properties of montmorillonite.It was found that the interlayer metal cations have a small radius and high …
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Hydration causes the expansion of montmorillonite interlayers, which then can help the adsorption of benzene to the interlayer spaces. As a result, the adsorption energy gradually evolves from large positive to negative as the water content increases to monolayer arrangement, and after that the adsorption energy remains negative.
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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 particles could be well dispersed in deionized water, and the coagulation was not prone to occur. The addition of imidazolium Gemini IL resulted in considerable change in ...
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Montmorillonite (Mt) expansion and swelling are key factors determining the barrier performance of bentonite in trans-uranic (TRU) and high-level radioactive waste disposal. ... The hydration of ...
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It is of paramount importance to understand the hydration swelling and weakening properties of clay minerals, such as montmorillonite, to determine their mechanical responses during deep underground argillaceous engineering. In this study, the mineral components and microscopic structure of mudstone were characterised using X-ray powder diffraction and field …
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In addition, MMT can be readily exfoliated into 2D montmorillonite nanosheet (MMTNS) with monolayer or few-layers thickness in aqueous environment through certain external force, including ultrasound, shearing and so on, [27] because MMT possess the excellent hydration expansion capacity. [28]
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