Carbon nanocones

Fig. 9. A, Model for the apex of a carbon nanocone with a cone angle of 19.2 [94] B, polyhedral and spherical forms of a multiwall carbon particle formed from and...

Yu, S.-S. Zheng, W.-T., Effect of N/B doping on the electronic and field emission properties for carbon nanotubes, carbon nanocones, and graphene nanoribbons. Nanoscale 2010,2 1069-1082. 

S. P. Jordan and V. H. Crespi, Theory of carbon nanocones mechanical chiral inversion of a micron-scale three-dimensional object, Phys. Rev. Lett. 93, 255504-1-4 (2004). 

The bundlet model for clusters of SWNTs was presented in [1], The aim of this report is to perform comparative study of properties of fullerenes, SWNTs and single-wall carbon nanocones (SWNCs) [2], A wide class of phenomena accompanying behaviour of SWNT-SWNC solutions is analyzed from unique point of view, taking into account tendency to cluster formation [3]. Based on droplet model of Ceo-SWNCs a bundlet model of SWNTs is proposed in [4]. SWNCs are model of complex systems (BN SWNCs) [5]. 

The single-wall carbon nanocone-nanohom packing efficiencies, and interaction-energy parameters, are intermediate between those of fullerene and single-wall carbon nanotube clusters. Therefore an in-between behaviour is expected. 

Static wetting of carbon nanocones contact angle hysteresis at nanometer scale... 

Carbon nanocones, disks and nanohorns 1. Multiple structures 2. Lower aggregation tendency Functionalized by microwave (for SWNHs) SPE, SPME ... 

Knaapila M, Romoen OT, Svasand E, Pinheiro JP, Martinsen 0G, Buchanan M, Skjeltorp AT, Helgesen G (2011) Conductivity enhancement in carbon nanocone adhesive by electric field induced formation of aligned assemblies. ACS Appl Mater Interfaces 3 378... 

SCANNING TUNNELING MICROSCOPY OF CARBON NANOTUBES AND NANOCONES... 

Hollow carbon nanostructures are exciting new systems for research and for the design of potential nano-electronic devices. Their atomic structures are closely related to their outer shapes and are described by hex-agonal/pentagonal network configttrations. The surfaces of such structures are atomically smooth and perfect. The most prominent of these objects are ftil-lerenes and nanotubesjl]. Other such novel structures are carbon onions[2] and nanocones[3]. 

Graphite was tised as substrate for the deposition of carbon vapor. Prior to the tube and cone studies, this substrate was studied by us carefully by STM because it may exhibit anomalotis behavior w ith unusual periodic surface structures[9,10]. In particular, the cluster-substrate interaction w as investigated IJ. At low submonolayer coverages, small clusters and islands are observed. These tend to have linear struc-tures[12j. Much higher coverages are required for the synthesis of nanotubes and nanocones. In addition, the carbon vapor has to be very hot, typically >3000°C. We note that the production of nanotubes by arc discharge occurs also at an intense heat (of the plasma in the arc) of >3000°C. 

Nanocones of carbon are found[3] in some areas on the substrate together with tubes and other mesoscopic structures. In Fig. 7 two carbon cones are displayed. For both cones we measure opening angles of 19.0 0.5°. The cones are 240 A and 130 A long. Strikingly, all the observed cones (as many as 10 in a (800 A) area) have nearly identical cone angles -19°. 

Figure 1. CNTs and other nano-sized carbon particles (a) scrolling a graphene sheet (b) closed and opened single-walled CNT (c) double-walled CNT (d) CNT sites doped with boron and nitrogen (e) nanopipettes (f) nanocones and (g) nanorings.

The synthesis of other nano-sized carbon structures (nanocones,9 nanopipettes10 and nanorings,11 presented in Figure le-g) has been recently reported. These structures have promising mechanical, electronic and surface properties, and are of interest for applications in nano-scale devices. 

Fullerenes—or cage compounds built exclusively from carbon atoms—and their metal-containing derivatives, metaUofuUerenes, were first observed in the gas phase by Kroto et al. [1,2] less than 20 years ago and prepared in crystalline form by Kratschmer et al. [3] less than 15 years ago. StiU, an enormous amount of observed and computed data has been obtained during this time (see, e.g. recent surveys on fullerenes [4-8] and endohedral metallofullerenes [9,10]). In addition to spheroidal fullerene cages, fullerene science also deals with other objects like elongated cylindrical bodies known as nanotubes, prepared by lijima [11] soon after mastering the fullerene synthesis, nanocones [12] or peapods [13]. AU the species exhibit a substantial application potential, especially for molecular electronics [14]. 

Carbon annealed nanodiscs/nanocones [7440-44-0], These are available as a black powder containing a mixture of 20% cones, 70% discs and 10% of carbon black impurities by weight. The carbon cones have a nearly perfect geometry. The five theoretically possible cones with apical angles of 19.2°, 38.9°, 60°, 84.6° and 112.9° are all present in the mixture with cone lengths of 0.3-0.8p, maximum base diameter of l-2p and wall thickness of 20-50 nanometers. The diameter and thickness of the discs are 0.88-3.5p and 20-50 nanometers respectively. A product of almost 100% carbon is obtained by annealing at 2500-2700° which increases the structural order and reduces the concentration of impurities particularly of metals (from eatalyst). They are similar to multi-walled carbon nanotubes (MWCNTs). 

Nature of Polymer Environments in in-situ Polymerized Nanocomposites The C NMR chemical shifts of a,p and y carbons of poly (2Epy) are sensitive to the surroundings of polymer chains in the nanocon osites. The changes in chemical shifts provide both the structural and physical nature of polymers. For diis purpose, we synthesized the bulk poly (2Epy) polymer and conqiared its NMR spectral features with the polymer that is intercalated in the nanocomposites formed by in-situ polymerization. The solid-state C CP/MAS... 

D. J. Klein and A. T. Balaban, Clarology for conjugated carbon nanostructures Molecules, polymers, graphene, defected graphene, fractal henzenoids, fullerenes, nanotuhes, nanocones, nanotori, etc.. Open Org. Chem. J. (Suppl. 1-M3) (2011) 27-61. 

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