Characterization of contact resistances in ceramic-coated vertically aligned carbon nanotube arrays

Li, Meng; Yang, Ning; Wood, Vanessa; Park, Hyung Gyu

doi:10.1039/c8ra10519g

Cited by 2 publications

(2 citation statements)

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“…Carbon nanotubes (CNTs) are excellent water conductors down to subnanometer pore diameters. − Aligned and hexagonally packed CNTs can form membrane-like structures . Such CNT membranes could be used for the design of dielectric materials and for filtration or desalination. − The selectivity of the filter can be tuned by functional groups at the ends of the CNTs. , CNT membranes have been built by growing forests of CNTs on a substrate and encapsulating them with silicon nitride, epoxy resins, or ceramics . However, the maximum possible pore density is not reached and the filled space between the CNTs does not contribute to solvent conduction.…”

Section: Introductionmentioning

confidence: 99%

“… 12 , 13 CNT membranes have been built by growing forests of CNTs on a substrate and encapsulating them with silicon nitride, 3 epoxy resins, 14 or ceramics. 15 However, the maximum possible pore density is not reached and the filled space between the CNTs does not contribute to solvent conduction. Here, we explore lipid-mediated self-assembly as an alternative route to densely packed CNT membranes.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous Membranes of Densely Packed Carbon Nanotubes Formed by Lipid-Mediated Self-Assembly

Vögele

Köfinger

Hummer

2022

ACS Appl. Bio Mater.

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Nanofiltration technology faces the competing challenges of achieving high fluid flux through uniformly narrow pores of a mechanically and chemically stable filter. Supported densepacked 2D-crystals of single-walled carbon nanotube (CNT) porins with ∼1 nm wide pores could, in principle, meet these challenges. However, such CNT membranes cannot currently be synthesized at high pore density. Here, we use computer simulations to explore lipid-mediated self-assembly as a route toward densely packed CNT membranes, motivated by the analogy to membrane-protein 2D crystallization. In large-scale coarse-grained molecular dynamics (MD) simulations, we find that CNTs in lipid membranes readily self-assemble into large clusters. Lipids trapped between the CNTs lubricate CNT repacking upon collisions of diffusing clusters, thereby facilitating the formation of large ordered structures. Cluster diffusion follows the Saffman-Delbruck law and its generalization by Hughes, Pailthorpe, and White. On longer time scales, we expect the formation of close-packed CNT structures by depletion of the intervening shared annular lipid shell, depending on the relative strength of CNT−CNT and CNT−lipid interactions. Our simulations identify CNT length, diameter, and end functionalization as major factors for the self-assembly of CNT membranes.

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