Structural Transformations of Carbon Nanotubes under Hydrostatic Pressure

Tangney, Paul; Capaz, Rodrigo B.; Spataru, Catalin D.; Cohen, Marvin L.; Louie, Steven G.

doi:10.1021/nl051637p

Cited by 103 publications

(120 citation statements)

References 21 publications

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“…In our MD simulations, the compressed nanochannel can quickly recover to its original shape (o0.2 ns). Similar mechanisms have been demonstrated in carbon nanotubes [33][34][35][36] , where the graphene sheet has a bending stiffness (0.91 eV) similar to that of the GO value calculated here (0.85 eV) 37,38 . The intercalated guest molecules in the nanochannels, such as water, provide additional elasticity for this reversibility.…”

Section: Resultssupporting

confidence: 87%

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

et al. 2013

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Pressure-driven ultrafiltration membranes are important in separation applications. Advanced filtration membranes with high permeance and enhanced rejection must be developed to meet rising worldwide demand. Here we report nanostrand-channelled graphene oxide ultrafiltration membranes with a network of nanochannels with a narrow size distribution (3-5 nm) and superior separation performance. This permeance offers a 10-fold enhancement without sacrificing the rejection rate compared with that of graphene oxide membranes, and is more than 100 times higher than that of commercial ultrafiltration membranes with similar rejection. The flow enhancement is attributed to the porous structure and significantly reduced channel length. An abnormal pressure-dependent separation behaviour is also reported, where the elastic deformation of nanochannels offers tunable permeation and rejection. The water flow through these hydrophilic graphene oxide nanochannels is identified as viscous. This nanostrand-channelling approach is also extendable to other laminate membranes, providing potential for accelerating separation and water-purification processes.

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Section: Resultssupporting

confidence: 87%

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

et al. 2013

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“…Under hydrostatic pressure, an isolated single-wall carbon nanotube deforms first radially, then flattens and eventually collapses [50]. For large diameter, the collapse is realized when two opposite sides of the deformed nanotube come close to the Van de Waals distance of 0.34 nm.…”

Section: Collapse Of Nanotubesmentioning

confidence: 99%

Graphene as a Prototypical Model for Two-Dimensional Continuous Mechanics

Lambin

2017

Applied Sciences

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This paper reviews a few problems where continuous-medium theory specialized to two-dimensional media provides a qualitatively correct picture of the mechanical behavior of graphene. A critical analysis of the parameters involved is given. Among other results, a simple mathematical description of a folded graphene sheet is proposed. It is also shown how the graphene-graphene adhesion interaction is related to the cleavage energy of graphite and its C 33 bulk elastic constant.

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“…3,4 In contrast to the high tensile strength, 5 CNTs are susceptible to mechanical distortion in their radial directions under applied hydrostatic pressure on the order of GPa. [6][7][8][9][10][11][12][13][14][15][16][17] The radial deformation controlled by the applied pressure provides an approach to modify the electronic properties of single walled carbon nanotube (SWCNTs), 18 consequently, radial deformation of SWCNTs can be observed by optical spectroscopy since the electronic band structure of a SWCNT is sensitive to its morphological transition. 4,19 In addition, a SWCNT's chemical reactivity depends on its mechanical deformations, [20][21][22] which plays the key role in the design of CNT-based gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Shape transition of unstrained flattest single-walled carbon nanotubes under pressure

Cao

Ouyang

2014

Journal of Applied Physics

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Single walled carbon nanotube's (SWCNT's) cross section can be flattened under hydrostatic pressure. One example is the cross section of a single walled carbon nanotube successively deforms from the original round shape to oval shape, then to peanut-like shape. At the transition point of reversible deformation between convex shape and concave shape, the side wall of nanotube is flattest. This flattest tube has many attractive properties. In the present work, an approximate approach is developed to determine the equilibrium shape of this unstrained flattest tube and the curvature distribution of this tube. Our results are in good agreement with recent numerical results, and can be applied to the study of pressure controlled electric properties of single walled carbon nanotubes. The present method can also be used to study other deformed inorganic and organic tube-like structures. V C 2014 AIP Publishing LLC. [http://dx

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Structural Transformations of Carbon Nanotubes under Hydrostatic Pressure

Cited by 103 publications

References 21 publications

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

Graphene as a Prototypical Model for Two-Dimensional Continuous Mechanics

Shape transition of unstrained flattest single-walled carbon nanotubes under pressure

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