Effects of pre-adsorbed water on methane adsorption onto blends with hydrophobic and hydrophilic nanosilicas

Гунько, В.М.; Туров, В. В.; Protsak, Iryna; Krupska, Т.V.; Pakhlov, E.M.; Tsapko, M. D.

doi:10.1016/j.colsurfa.2019.03.056

Cited by 19 publications

(8 citation statements)

References 49 publications

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“…Clear, the properties and characteristic of any nanostructured composites strongly depend on the distributions (uniform – nonuniform, nanolayers – nanoclusters – nanodomains – microdomains – monolith fragments) of different components in the composites. These effects could be stronger (especially upon interaction with water [31,32,33,34,35,36,37]) for the composites with nanostructured hydrophilic and hydrophobic components [38,39]. Using specific treatments and certain (rather small) amounts of water, it is possible to prepare hydrophilic blends with hydrophobic and hydrophilic components.…”

Section: Introductionmentioning

confidence: 99%

“…Using specific treatments and certain (rather small) amounts of water, it is possible to prepare hydrophilic blends with hydrophobic and hydrophilic components. Subsequent treatments (e.g., drying) of these blends allow one to obtain hydrophobic composites, the hydrophilic properties of which can renew after additional treatment (e.g., wetting and stirring or grinding at greater mechanical loading) [38,39].…”

Section: Introductionmentioning

confidence: 99%

“…Fumed nanosilica and PMS are soft-powder materials because their aggregates of nanoparticles and agglomerates of aggregates may be easily rearranged under any treatment [36]. The results of these treatments depend on several factors such as the (i) hydrational, thermal, and mechanical history of the components; (ii) the weight ratio of the components; (iii) the amounts of added water; (iv) the mechanical loading; (v) the time of treatment; and (vi) the temperature [1,2,24,25,26,36,37,38,39,40,41]. In this study, two important factors, namely, a small amount of added water and the type of mechanical loading upon stirring of the PMS/nanosilica blends, are analyzed to control the characteristics of the final blends.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Polymethylsiloxane/Fumed Silica Blends

et al. 2019

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Polymethylsiloxane (PMS) and fumed silica, alone and in a blended form (1:1 w/w), differently pretreated, hydrated, and treated again, were studied using TEM and SEM, nitrogen adsorption–desorption, 1H MAS and 29Si CP/MAS NMR spectroscopy, infrared spectroscopy, and methods of quantum chemistry. Analysis of the effects of adding water (0–0.5 g of water per gram of solids) to the blends while they are undergoing different mechanical treatment (stirring with weak (~1–2 kg/cm2) and strong (~20 kg/cm2) loading) show that both dry and wetted PMS (as a soft material) can be grafted onto a silica surface, even with weak mechanical loading, and enhanced mechanical loading leads to enhanced homogenization of the blends. The main evidence of this effect is strong nonadditive changes in the textural characteristics, which are 2–3 times smaller than additive those expected. All PMS/nanosilica blends, demonstrating a good distribution of nanosilica nanoparticles and their small aggregates in the polymer matrix (according to TEM and SEM images), are rather meso/microporous, with the main pore-size distribution peaks at R > 10 nm in radius and average <RV> values of 18–25 nm. The contributions of nanopores (R < 1 nm), mesopores (1 nm < R < 25 nm), and macropores (25 nm < R < 100 nm), which are of importance for studied medical sorbents and drug carriers, depend strongly on the types of the materials and treatments, as well the amounts of water added. The developed technique (based on small additions of water and controlled mechanical loading) allows one to significantly change the morphological and textural characteristics of fumed silica (hydrocompaction), PMS (drying–wetting–drying), and PMS/A-300 blends (wetting–drying under mechanical loading), which is of importance from a practical point of view.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanostructured Polymethylsiloxane/Fumed Silica Blends

et al. 2019

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“…As the pressure increases, the excess adsorption capacity gradually increases for all minerals except for organic matter. However, its adsorption capacity increases faster under low pressure, − and slows down under high pressure. With the increase of temperature, the adsorption amount of CH 4 of all minerals decreased.…”

Section: Resultsmentioning

confidence: 99%

Impacts and Mechanisms of Water on CH₄ Adsorption on Shale Minerals

Wang

Zhou

et al. 2023

Energy Fuels

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Formation water (FW) and fracturing fluid (FF) significantly affect the adsorption rules of CH4 on a shale surface. To clarify the impact rules and micromechanisms of FW and FF on CH4 adsorption, isothermal adsorption experiments of CH4 on different shale minerals with different equilibrium water were conducted. Then, the corresponding adsorption models were constructed by Grand Canonical Monte Carlo (GCMC) simulation to perform adsorption simulation after matching experiments. Finally, molecular dynamic (MD) simulation was carried out to study the micromechanisms of FW and FF affecting CH4 adsorption on different shale minerals. The results show that the adsorption capacity of organic matter to CH4 is much stronger than that of other minerals. Compared to dry conditions, the adsorption capacity of organic matter, smectite, illite, and total shale with FW (S w ≈ 15%) decreases to 65, 45, 70, and 55%, respectively. The impact of FF on CH4 adsorption capacity is more significant than FW. The adsorption capacity decreases to 45, 30, 50, and 45% for organic matter, smectite, illite, and total shale with FF (S w ≈ 15%), respectively. FW molecules inhibit CH4 adsorption by occupying adsorption sites on mineral surfaces. However, the HPAM in FF completely covers the mineral surface to compress adsorption space and hinder CH4 adsorption. Although water molecules in both FW and FF occupy part of the adsorption sites on organic matter, the left sites can still absorb large amounts of CH4. It provides theoretical guidance for the efficient development of shale gas.

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“…In addition, KDP structures [28], as well as many other nanofillers [29][30][31][32][33][34], can be used in the biomedical field, provided that they are nanosized. Such structures can also be used as promising sorbents [35][36][37][38][39][40][41][42][43], for example, hydrogen sorbents, both in the form of carbon nanostructures [44][45][46][47][48], metals and various alloys [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. All this will complement the existing developments in the field of hydrogen energy [67][68][69][70][71][72][73].…”

Section: Introductionmentioning

confidence: 99%

Crystalline potassium dihydrogen phosphate (KDP) powders

Zolotarenko,

Matysina

et al. 2023

Poverhn.

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The article discusses the use of KDP ferroelectric crystals (phosphates and arsenates of potassium, rubidium, cesium) and their deuterated analogues in various industries, including the creation of electro-optical devices and as hydrogen sorbents. The paper describes the physical properties of KDP crystals, changes in their properties near the phase transition temperature, as well as methods for obtaining KDP nanocrystals and their application in biomedicine. The paper also states that the phase transition in KDP crystals occurs near room temperature and manifests itself in a change in their physical properties, such as dielectric constant, optical properties, and heat capacity. In addition, approaching the phase transition temperature causes a change in the crystal lattice parameters, which can lead to the appearance of anomalous effects. The structure of the unit cell of potassium dihydrogen phosphate (KH2PO4) is considered. The plots of the temperature dependence of the order parameter of spontaneous polarization and the plots of the temperature dependence of the configurational heat capacity of the crystal in the phase transition region are calculated, and the plots of the temperature of the inverse and direct dielectric susceptibility are calculated. Graphs of the order parameter, which characterizes the degree of spontaneous polarization for different temperatures, depending on the strength of the external electric field, are also calculated.

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Effects of pre-adsorbed water on methane adsorption onto blends with hydrophobic and hydrophilic nanosilicas

Cited by 19 publications

References 49 publications

Nanostructured Polymethylsiloxane/Fumed Silica Blends

Nanostructured Polymethylsiloxane/Fumed Silica Blends

Impacts and Mechanisms of Water on CH₄ Adsorption on Shale Minerals

Crystalline potassium dihydrogen phosphate (KDP) powders

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Effects of pre-adsorbed water on methane adsorption onto blends with hydrophobic and hydrophilic nanosilicas

Cited by 19 publications

References 49 publications

Nanostructured Polymethylsiloxane/Fumed Silica Blends

Nanostructured Polymethylsiloxane/Fumed Silica Blends

Impacts and Mechanisms of Water on CH4 Adsorption on Shale Minerals

Crystalline potassium dihydrogen phosphate (KDP) powders

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Product

Resources

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Impacts and Mechanisms of Water on CH₄ Adsorption on Shale Minerals