##tihuan2##The swelling occurs as ions are hydrated when water enters the 2:1 layers and is followed by osmotic absorption of water. This swelling pattern depends ... which increases the drug release rate. Montmorillonite-based tablets have been prepared ... (1997) Calcium and sodium bentonite for hydraulic containment applications. J Geotech Geoenviron ...
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##tihuan2##During the expansion process, cation exchange induced by NaCl solution transforms calcium bentonite into sodium bentonite. Specifically, the swelling of the crystal layer in Na-based bentonite exhibits a slightly greater increase compared to Ca …
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##tihuan2##The swelling effect of sodium-bentonite as an additive in water-based drilling sludge with different concentration of polyamine inhibition March 2021 IOP Conference Series Materials Science and ...
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##tihuan2##The swelling rate and swelling potential of the B/S mixtures are significantly reduced, not only due to the increase in salinity of the water (chemical factor), but also …
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##tihuan2##Montmorillonite is a naturally occurring clay and commonly used to prepare nanocomposite hydrogels, because of their good water absorption, extensive swelling in water and cation exchange capacity.
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##tihuan2##A model structure of a Na-montmorillonite clay was put into contact with pure water, sodium chloride, and calcium chloride solns. ... The swelling pressure of bentonite clay is an important characteristic that influences its use in nuclear waste disposal repositories. A mol. dynamics study was performed to investigate the influence of salt ...
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##tihuan2##Sodium bentonite is added to adsorb the ink pigment after which the cellulose fibers are washed to remove the bentonites which carries the ink pigment with it. Sodium bentonite is also used to prevent agglomeration of pitches, tars, waxes, and resinous material (Murray, 1984). The addition of 0.5% bentonite based on the dry …
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##tihuan2##It ranks first in the world for bentonite production, which, however, is mainly low-grade calcium bentonite. Compared with sodium-based bentonite, calcium-based bentonite has poor water absorption properties, swelling capacity and cation exchange capacity; in addition, sodium-based bentonite has better dispersibility, suspension …
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##tihuan2##KGM-g-P(AA-co-AM) achieved maximum water absorption rate of 650 g/g in distilled water and 70 g/g in 0.9 wt% NaCl solution [31]. Moreover, the water absorption rate in distilled water of KGM-AA polymers can reach to 1941 g/g by adding kaolin as fillers, which indicates kaolin is a potential material to enhance water absorbency [32].
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##tihuan2##To develop the water swelling rubber from natural rubber, the addition of water absorption filler is needed. The study was aimed to formulate water swelling rubber from natural rubber filled with sodium polyacrylate (SA)/sodium bentonite clay (SBC) hybrid filler used to water absorbent. The filler loading was kept constantly at 150 phr.
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##tihuan2##Using molecular dynamics simulation, this study (i) simulated for the first time the free 1W–2W transition during clay hydration and (ii) identified the underlying mechanism to be the detachment of cations …
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##tihuan2##The high tendency of water absorption from Na + ion in sodium montmorillonite makes it prone to absorb as much water as it can, and this can be …
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##tihuan2##The generation of swelling-pressure in sodium-type bentonite is considered to be caused by increases in the distance between unit layers due to the absorption of large amounts …
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##tihuan2##The work of Elmashad presents a solution for the swelling characteristics of bentonite by measuring the effects of adding chemicals to the soil as sodium chloride, ammonium chloride, lime, and ...
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##tihuan2##3.3.. Swelling behaviour of hydrogelsThe influences of Na +-BT, organoBT, and the content of the BT in the copolymeric gels on the swelling in deionized water (1 series) and saline solution (2 series) is studied here.In order to obtain high rate and capacity of swelling, as well as optimized efficiency in retaining fluid and appropriate gel …
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##tihuan2##In contrast, calcium bentonite, which contains Ca 2+ ions, is less susceptible to water absorption, and is known as a lowswelling bentonite [32,33].
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##tihuan2##In arid areas, the rapid evaporation of water leads to severe water shortage for plant growth. Superabsorbent polymers have the prospect of preventing water evaporation because of its excellent water absorbency. However, insufficient in salt resistance, water retention, and swelling rate limit its application. Herein, we fabricated …
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##tihuan2##Superabsorbent polymers (SAPs) can absorb a large amount of water and find broad applications in various industries. There are many reports on the synthesis and structural modification techniques to …
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##tihuan2##Water-based drilling fluids for high-temperature applications and water-sensitive and dispersible shale formations. ... Experimental data indicated that the diutan gum stability temperature in bentonite water-suspension after aging for 16 h was 115 °C. Experimental data also indicated that the mud formulations with the additives - …
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##tihuan2##Bentonite is a clay that consists of mostly clay minerals from the smectite group (i.e. montmorillonite). It is considered as a suitable buffer and sealing barrier material due to its high swelling capacity, high water absorption, low hydraulic conductivity, self-sealing characteristic, and good ability to contain radionuclides if canisters fail (Cho et …
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##tihuan2##The objectives of the laboratory tests were to determine the water absorption rate, swelling rate and cracking of the bentonite with respect to time at different conditions when a bentonite block is placed above a free water surface separated by an air gap. ... the temperature and the sample size. The material is a commercially available sodium ...
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##tihuan2##In this article, we report a novel physical and chemical composite ing system, which was used to successfully prepare high-performance and low-cost composite superabsorbent [poly(sodium acrylic acid) (PAA–Na)] hydrogels based on acrylic acid by free-radical polymerization in a water bath under a nitrogen atmosphere without the use …
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##tihuan2##With the increase of ionic strength, the content of total water and permeated hydrated water (accounting for 69%–95%) in bentonite decreases gradually, whereas …
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##tihuan2##The Sodium bentonite-AA-based hydrolysis-resistant SC is prepared and had good reusability and, after swelling six times at 150 °C, could still hold roughly 73% of its initial water absorbency . In another study, starch- AA-Bentonite-based SC is prepared, in one hour, the rate of water absorption reached 72.65% of the maximal rate, and ...
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##tihuan2##Sodium-based bentonite can be utilized as the main slurry ingredient in drilling fluid. The attributes of sodium-based bentonite include high cost, high water swelling rate, sluggish water adsorption speed, good dispersion in water, and thixotropy. ... The result showed that the oil absorption value and water absorption rate were …
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##tihuan2##The swelling occurs as ions are hydrated when water enters the 2:1 layers and is followed by osmotic absorption of water. This swelling pattern depends on ... which increases the drug release rate. Montmorillonite-based tablets have been prepared using ... Calcium and sodium bentonite for hydraulic containment applications. J Geotech ...
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##tihuan2##Dry and heated pellet compressive strengths of hematite pellets bonded with 1 kg/ton of starches with varying plate water absorption values. PWA measured at 25°C in distilled water via ASTM …
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##tihuan2##At lo w bentonite content, the rate of swelling w as ver y slow with sand but. ... "Swelling pressure of sodium ... the water absorption during the swell reduced with the increase of QD ...
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##tihuan2##During the expansion process, cation exchange induced by NaCl solution transforms calcium bentonite into sodium bentonite. Specifically, the swelling of the crystal layer in Na-based bentonite exhibits a slightly greater increase compared to Ca-bentonite and Mg-bentonite when water absorption occurs (MOORE and HOWER …
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