Tunable transport of a methane-water mixture through a carbon nanotube

Kang, X.; Meng, Xiuxia; Yang, Xianqing

doi:10.1016/j.chemphys.2022.111544

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…31−33 The inner wall of the SWCNT is very smooth, and it is generally believed that there is no friction in the interior of the armrest SWCNT in a gas−liquid flow field. 34,35 Thus, the SWCNT has a more uniform and smoother adsorption potential compared to the rough coal pore walls. Therefore, in MD calculations of the interior of SWCNT, the Lennard-Jones potential energy function ν(ρ) is used to calculate the adsorption interaction: 36…”

Section: Introductionmentioning

confidence: 99%

“…The inner wall of the SWCNT is very smooth, and it is generally believed that there is no friction in the interior of the armrest SWCNT in a gas–liquid flow field. , Thus, the SWCNT has a more uniform and smoother adsorption potential compared to the rough coal pore walls. Therefore, in MD calculations of the interior of SWCNT, the Lennard-Jones potential energy function ν(ρ) is used to calculate the adsorption interaction: ν ( ρ ) = 4 ε [ ( ρ 0 ρ ) 12 − ( ρ 0 ρ ) 6 ] where ε is the depth of the adsorption potential well and represents the adsorption strength of the adsorbent toward the adsorbate; ρ is the distance between the adsorbent and adsorbate; and ρ 0 is the equilibrium distance of the potential energy.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

Zha,

Lin,

Liu

et al. 2024

Energy Fuels

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To simplify the analysis of the adsorption of methane by coal, single-walled carbon nanotubes (SWCNTs), slit graphene lamellae, and bituminous coal pore models were constructed, and the adsorption of methane molecules in the three models was studied using molecular dynamics and density functional theory. The results show that methane molecules cannot be adsorbed within carbon nanotubes with a pore size of 0.5 nm. In carbon nanotubes with a pore size of 1 nm, adsorbed methane is influenced by the inner wall of the SWCNTs to induce dipoles and to interact with nearby methane molecules. In large-pore-size carbon nanotubes and graphene sheets, methane molecules adsorb and accumulate on the wall surface to form adsorption rings, the thickness of which gradually increases with the pore size under the effect of curvature, ranging from 0.455 to 0.521 nm. This criterion for adsorption was applied to the pore model of bituminous coal, and 52 adsorbed methane states were determined. Furthermore, the Brunauer–Emmett–Teller equation was used to fit the methane isothermal adsorption curve of the bituminous coal pore model, and the adsorption quantity of methane in a single molecular layer was 54, confirming that the adsorption criterion of 0.521 nm is reasonable.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

Zha,

Lin,

Liu

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…As an unconventional energy source, CBM is a natural and clean energy source that can be used as a fuel and a chemical raw material and is of great significance to the global energy development strategy 2–4 . How to improve the permeability of coal beds is a key factor affecting CBM mining, in which acidification technology has been applied in engineering practice and has clear development prospects 5–8 …”

Section: Introductorymentioning

confidence: 99%

“…[2][3][4] How to improve the permeability of coal beds is a key factor affecting CBM mining, in which acidification technology has been applied in engineering practice and has clear development prospects. [5][6][7][8] Acidizing technology refers to the restoration or enhancement of the permeability of formation pores and cracks through the dissolving and erosioning action of acid on rock cement or blockages in formation pores and cracks, and so on. This technology shows obvious penetration-enhancing effects in carbonate, sandstone, and shale reservoirs and is therefore widely used in oil, natural gas, and shale gas extraction applications.…”

Section: Introductorymentioning

confidence: 99%

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

He,

Li,

Xue

et al. 2023

Energy Science & Engineering

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By eliminating their minerals, acidification technology makes coal seams more permeable. Acidification technology were conducted in the Farr and Qinglong mining areas using a mixed acid solution to study the impact of acidification technology on increasing the permeability of primary structural coals in the Guizhou region, China. The microphysical and chemical structure of the coal samples before and after acidification transformation was compared using X‐ray diffraction, scanning electron microscope, mercury intrusion porosimetry, and Fourier transform infrared spectrometry experiments. The results show that after acidification, the volatile matter content is reduced by 4.2% and 16.25%, the carbon content is increased, the degree of coalification is deepened, the gas content of the coal seam is elevated, and the gas source is more abundant. The minerals on the surface are dissolved to different degrees, and the pores and cracks are dredged, so that the surface of the coal samples shows better connectivity, which is conducive to the diffusion and transport of coalbed methane. The volume and pore diameter of the macropore and mesopore in the Farr coal samples were improved after acidification, and the fractal structure was more prominent, the pore connectivity was good, and the pore diameter of the Qinglong coal samples was greatly increased. The content of oxygen‐containing functional groups increased by 11.2% and 2.1%, respectively, which is conducive to the desorption of coalbed methane after acidification, and with the increasing degree of metamorphism of the coal samples, the higher the content of oxygen‐containing functional groups was and the less pronounced the effect of acidification. Acidification technology can effectively remove the minerals in the coal body and has a good effect on penetration enhancement, and the results of the study can provide certain theoretical references for the penetration enhancement of coal seams in Guizhou mining areas.

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Effect of carbon nanotube diameter on water transfer through disjoint carbon nanotubes in the lateral electric fields

Kang

Meng

2023

Chemical Physics

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Tunable transport of a methane-water mixture through a carbon nanotube

Cited by 9 publications

References 52 publications

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

Research on how acidification affects the coal's microscopic pore structure in the Guizhou mining region

Effect of carbon nanotube diameter on water transfer through disjoint carbon nanotubes in the lateral electric fields

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