Distinct transport properties of O<sub>2</sub>and CH<sub>4</sub>across a carbon nanotube

Meng, Xiuxia; Wang, Yu; Zhao, Yuemin; Huang, Jiping

doi:10.1080/00268976.2012.762126

Cited by 6 publications

(3 citation statements)

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“…The transport of oxygen through CNTs can occur through several mechanisms: Knudsen diffusion, surface diffusion, and void spaces between the CNTs. [29][30][31][32] Knudsen diffusion describes that gas molecules collide less frequently with the nanotube's inner walls, leading to enhanced diffusion rates. [29,30] Surface diffusion, on the other hand, involves the adsorption and desorption of gas molecules on the CNTs.…”

Section: Introductionmentioning

confidence: 99%

“…Gas molecules, e.g., oxygen, may adsorb onto the nanotube's internal and external surfaces, followed by diffusing along its length and subsequently desorbing into the surrounding environment. [31][32][33] The arrangement of CNTs could also generate large void spaces between different CNTs, which allows oxygen and nutrients to pass through rapidly, yielding high diffusion rates. [34] Stem cells can undergo osteogenesis through induction in a culture medium supplemented with both phosphate and DEX.…”

Section: Introductionmentioning

confidence: 99%

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3D Stem Cell Spheroids with 2D Hetero‐Nanostructures for In Vivo Osteogenic and Immunologic Modulated Bone Repair

Liu,

Astudillo Potes,

Dashtdar

et al. 2024

Adv Healthcare Materials

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Three‐dimensional (3D) stem cell spheroids have immense potential for various tissue engineering applications. However, current spheroid fabrication techniques encounter cell viability issues due to limited oxygen access for cells trapped within the core, as well as non‐specific differentiation issues due to the complicated environment following transplantation. In this study, we developed functional 3D spheroids using mesenchymal stem cells (MSCs) with two‐dimensional (2D) hetero‐nanostructures (HNS) composed of single‐stranded DNA (ssDNA) binding carbon nanotubes (sdCNT) and gelatin‐bind black phosphorus nanosheets (gBPNS). An osteogenic molecule, dexamethasone (DEX), was further loaded to fabricate an sdCNTgBP‐DEX hetero‐nanostructure. This approach aimed to establish a multi‐functional cell‐inductive 3D spheroid with improved oxygen transportation through hollow nanotubes, stimulated stem cell growth by phosphate ions supplied from BP oxidation, in‐situ immunoregulation, and osteogenesis induction by DEX molecules after implantation. Initial transplantation of the 3D spheroids in rat calvarial bone defect showed in vivo macrophage shifts to an M2 phenotype, leading to a pro‐healing microenvironment for regeneration. Prolonged implantation demonstrated outstanding in vivo neovascularization, osteointegration, and new bone regeneration. Therefore, these engineered 3D spheroids hold great promise for bone repair as they allow for stem cell delivery and provide immunoregulative and osteogenic signals within an all‐in‐one construct.This article is protected by copyright. All rights reserved

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D Stem Cell Spheroids with 2D Hetero‐Nanostructures for In Vivo Osteogenic and Immunologic Modulated Bone Repair

Liu,

Astudillo Potes,

Dashtdar

et al. 2024

Adv Healthcare Materials

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“…A carbon nanotube offers an ideal nanoconfined environment. The dynamic properties of gas mixtures in a carbon nanotube may give some clues on methane production [13][14][15]. For example, Joonho Lee and N. R. Aluru investigated equilibrium transport of gas-water mixtures in carbon nanotubes, such as CO 2 -water, O 2 -water and H 2 -water mixtures.…”

Section: Introductionmentioning

confidence: 99%

Gases of driving methane out of a carbon nanotube

Meng

Shen

2020

J. Phys. Commun.

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Methane is a kind of clean energy resource. Driving methane molecules out of a nanochannel efficiently is helpful to increase mining efficiency. Injecting other gas molecules is an ideal method to increase methane production. By molecular dynamics simulation, we take the adsorption behaviors of methane (CH 4 ) and nitrogen (N 2 ) mixture in a carbon nanotube for example. Compared with nitrogen (N 2 ), methane (CH 4 ) obtains an advantage on adsorption in a carbon nanotube when methane concentration changes from 0.1 to 0.9. By changing the parameters of ε and σ, we find two parameters can regulate the adsorption behaviors of methane in a carbon nanotube. The probability of driving CH 4 molecules out of a carbon nanotube increases with increasing the parameter of ε at the same σ, while the probability of driving CH 4 out of a carbon nanotube increases at first and then decreases with increasing σ at the same ε. We expect the results could guide the process of methane production efficiently in a physical view.

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