The tubular conical helix of graphitic boron nitride

Xu, Fang; Bando, Yoshio; Golberg, Dmitri

doi:10.1088/1367-2630/5/1/118

Cited by 13 publications

(11 citation statements)

References 38 publications

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“…Both families are achiral since they exhibit symmetry planes in directions both parallel and perpendicular to the nanotube elongation axis. All other nanotube types are chiral and do not exhibit any symmetry plane [11], actually made of SWCNTs of increasing diameters concentrically assembled; (b) and (c) are two possibilities for the so-called 'herringbone' texture: (b) is made of stacked, truncated graphenebased cones (Adapted from [12]); (c) is made of a single ribbonlike graphene helically wrapped over itself (Adapted from [13]). (d) is one possibility of the so-called 'bamboo' texture (From [14]), for which graphenes can be displayed perpendicular to the nanotube axis, thereby locally closing up the inner nanotube cavity.…”

Section: Describing Carbon Nanotubes Carbon Nanotubes As Graphene-basmentioning

confidence: 99%

Properties of Carbon Nanotubes

Monthioux

Flahaut

Escoffier

et al. 2014

Handbook of Nanomaterials Properties

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Section: Describing Carbon Nanotubes Carbon Nanotubes As Graphene-basmentioning

confidence: 99%

Properties of Carbon Nanotubes

Monthioux

Flahaut

Escoffier

et al. 2014

Handbook of Nanomaterials Properties

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“…10,11,18 A hollow conical helix of BN ͑BNHCH͒ has also been studied, which was generated by the simple wrapping of a single beltlike filament similar to a helical structure but without any capping. 9,22,23 Combination of several nonhexagonal rings can also result in closed conelike structures, as is the case, for example, if nanotube ends are capped, or with interconnecting layers of bamboolike nanotubes. 24,25 In these cases, however, it is not possible to distinguish between stacked conical layers simply by measuring the apex angle distributions.…”

Section: A Structurementioning

confidence: 99%

“…The BNHCHs were grown by using CNT substitution followed by a post heating process at an isothermal higher temperature ͑1750°C -1900°C͒. 9,22 The BN helical cone particles were produced by heat treating a B-C-N compound to 2200°C. 10,18 The BN closed cones were part of a material constituted primarily of BN nanotubes synthesized by reacting boron oxide vapor with CNTs under a nitrogen flow at 1500°C.…”

Section: A Structurementioning

confidence: 99%

Growth and structure of prismatic boron nitride nanorods

et al. 2006

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Prismatic boron nitride nanorods have been grown on single crystal silicon substrates by mechanical ballmilling followed by annealing at 1300°C. Growth takes place by rapid surface diffusion of BN molecules, and follows heterogeneous nucleation at catalytic particles of an Fe/ Si alloy. Lattice imaging transmission electron microscopy studies reveal a central axial row of rather small truncated pyramidal nanovoids on each nanorod, surrounded by three basal planar BN domains which, with successive deposition of epitaxial layers adapt to the void geometry by crystallographic faceting. The bulk strain in the nanorods is taken up by the presence of what appear to be simple nanostacking faults in the external, near-surface domains which, like the nanovoids are regularly repetitive along the nanorod length. Growth terminates with a clear cuneiform tip for each nanorod. Lateral nanorod dimensions are essentially determined by the size of the catalytic particle, which remains as a foundation essentially responsible for base growth. Growth, structure, and dominating facets are shown to be consistent with a system which seeks lowest bulk and surface energies according to the well-known thermodynamics of the capillarity of solids.

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“…Furthermore, Han et al [18] study conical nanotubes using highresolution transmission electron microscopy and electron energy loss spectroscopy, and suggest that nested cones occur with the same apex angle as for boron nitride. Xu et al [19] successfully synthesise conical helices of graphitic boron nitride and they theoretically examine their elastic properties. These helices hold considerable promise for potential applications in new-generation high-performance composite materials.…”

Section: Introductionmentioning

confidence: 99%

Nested boron nitride and carbon-boron nitride nanocones

Baowan

Hill

2007

Micro Nano Lett.

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In this letter we extend previously established results for nested carbon nanocones to both nested boron nitride and carbon-boron nitride nanocones. Based purely on mechanical principles and classical mathematical modelling techniques, we determine the energetically favourable structures for nested boron nitride and carbon-boron nitride nanocones. While only three apex angles for boron nitride tend to occur, we also consider the other two angles corresponding to the equivalent carbon nanocones. Two nanocones are assumed to be located co-axially in a vacuum environment. The Lennard-Jones parameters for boron nitride and carbon-boron nitride systems are calculated using the standard mixing rule. For the boron nitride cones, numerical results indicate that the interspacing between two cones is approximately 3.4 A ° which is comparable with the experimental results. For the hybrid carbon-boron nitride cones, the numerical results essentially depend on the outer cone angle, and the interspacing distance is also obtained to be approximately 3.4 A ° . Moreover, the equilibrium position is such that one cone is always inside the other, and therefore nested double-cones are possible in practice. Nested boron nitride and carbon-boron nitride nanocones Disciplines Physical Sciences and Mathematics D. Baowan and J.M. HillAbstract: In this letter we extend previously established results for nested carbon nanocones to both nested boron nitride and carbon-boron nitride nanocones. Based purely on mechanical principles and classical mathematical modelling techniques, we determine the energetically favourable structures for nested boron nitride and carbon-boron nitride nanocones. While only three apex angles for boron nitride tend to occur, we also consider the other two angles corresponding to the equivalent carbon nanocones. Two nanocones are assumed to be located co-axially in a vacuum environment. The Lennard-Jones parameters for boron nitride and carbon-boron nitride systems are calculated using the standard mixing rule. For the boron nitride cones, numerical results indicate that the interspacing between two cones is approximately 3.4 Å which is comparable with the experimental results. For the hybrid carbon-boron nitride cones, the numerical results essentially depend on the outer cone angle, and the interspacing distance is also obtained to be approximately 3.4 Å . Moreover, the equilibrium position is such that one cone is always inside the other, and therefore nested double-cones are possible in practice.

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The tubular conical helix of graphitic boron nitride

Cited by 13 publications

References 38 publications

Properties of Carbon Nanotubes

Properties of Carbon Nanotubes

Growth and structure of prismatic boron nitride nanorods

Nested boron nitride and carbon-boron nitride nanocones

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