Naturally occurring graphite cones

Jaszczak, John A.; Robinson, Grace; Dimovski, Svetlana; Gogotsi, Yury

doi:10.1016/s0008-6223(03)00214-8

Cited by 93 publications

(51 citation statements)

References 22 publications

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“…This type of defects have been observed in experiments with carbon nanoparticles [14,18,19,20] and other layered materials [21]. Conical defects with an arbitrary opening angle can be produced by accumulation of pentagons in the cone tip and have been observed in [22,23]. Inclusion of an equal number of pentagons and heptagonal rings in a graphene sheet would keep the flatness of the sheet at large scales and produce a flat structure with curved portions that would be structurally stable and have distinct electronic properties.…”

Section: Introductionmentioning

confidence: 74%

A cosmological model for corrugated graphene sheets

Cortijo

Vozmediano

2007

Eur. Phys. J. Spec. Top.

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Abstract. Defects play a key role in the electronic structure of graphene layers flat or curved. Topological defects in which an hexagon is replaced by an n-sided polygon generate long range interactions that make them different from vacancies or other potential defects. In this work we review previous models for topological defects in graphene. A formalism is proposed to study the electronic and transport properties of graphene sheets with corrugations as the one recently synthesized. The formalism is based on coupling the Dirac equation that models the low energy electronic excitations of clean flat graphene samples to a curved space. A cosmic string analogy allows to treat an arbitrary number of topological defects located at arbitrary positions on the graphene plane. The usual defects that will always be present in any graphene sample as pentagon-heptagon pairs and Stone-Wales defects are studied as an example. The local density of states around the defects acquires characteristic modulations that could be observed in scanning tunnel and transmission electron microscopy.

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Section: Introductionmentioning

confidence: 74%

A cosmological model for corrugated graphene sheets

Cortijo

Vozmediano

2007

Eur. Phys. J. Spec. Top.

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“…Cones are a further member of uniaxial polar particles. Carbon nanocones appear naturally in graphite [34][35][36] and do not need to be produced by an elaborate method. By the mergence of two spheres with different diameters, one obtains a pear-like particle [37,38].…”

Section: Geometric Classification Of Colloidal Particlesmentioning

confidence: 99%

Dynamical density functional theory for colloidal particles with arbitrary shape

2011

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Starting from the many-particle Smoluchowski equation, we derive dynamical density functional theory for Brownian particles with an arbitrary shape. Both passive and active (self-propelled) particles are considered. The resulting theory constitutes a microscopic framework to explore the collective dynamical behavior of biaxial particles in nonequilibrium. For spherical and uniaxial particles, earlier derived dynamical density functional theories are recovered as special cases. Our study is motivated by recent experimental progress in preparing colloidal particles with many different biaxial shapes.

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“…On a nano-scale, however, CM of a certain metamorphic grade can display strong structural variation and can contain a wide variety of sp 2 -bound carbon nano-structures including graphitic globules (Kovalevski et al, 2001), carbon onion rings (Beyssac et al, 2002b;Buseck and Huang, 1985), graphite cones (Jaszczak et al, 2003), rolled graphitic structures (Jaszczak et al, 2007), and curled graphite structures (Papineau et al, 2010). In general this can be related to the fact that organic precursor materials are heterogeneous in both molecular structure and chemical composition.…”

Section: Introductionmentioning

confidence: 99%