scispace - formally typeset
Search or ask a question
Topic

Fullerene

About: Fullerene is a research topic. Over the lifetime, 12723 publications have been published within this topic receiving 359173 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, it was shown that the smallest fullerene, the dodecahedron C$20$, has the lowest energy, while the monocyclic ring is the most stable 20-atom carbon species.
Abstract: Contrary to recent experimental evidence suggesting that the monocyclic ring is the most stable 20-atom carbon species, highly accurate calculations convincingly predict that the smallest fullerene, the dodecahedron C$_{20}$, has the lowest energy. A related corannulene-like bowl is nearly degenerate in energy to the fullerene. Thermodynamic considerations suggest that at formation temperatures of around 700 K the bowl should be the dominant species. The recent application of gradient corrections to LDA which supported the ring structure is qualitatively in error. (RK-94-02)

84 citations

Journal ArticleDOI
TL;DR: In this article, the effect of solvent polarity on the aggregation behavior of C70 has been investigated in several mixed solvents using optical absorption, fluorescence, dynamic light scattering and scanning electron microscopic measurements.

84 citations

Journal ArticleDOI
TL;DR: The single-bonded fullerene dimer RC60 C60R, which has a direct covalent bond between two C60 cages, is an interesting and unusual structure that is expected to display interesting optical and electronic properties through the interaction of two adjacent fullerenes.
Abstract: The single-bonded fullerene dimer RC60 C60R, which has a direct covalent bond between two C60 cages, is an interesting and unusual structure that is expected to display interesting optical and electronic properties through the interaction of two adjacent fullerene cages. Since the pioneering work by Krusic and co-workers, studies on ESR and X-ray crystalstructure analysis revealed that singly bonded fullerene dimers consist of racemic and meso isomers, which are in equilibrium with the monomer radical (RC60C) in solution. [3]

84 citations

Journal ArticleDOI
TL;DR: The preparation and characterization of a stable [4]circulene is reported and the trivial name quadrannulene (Latin: quadra, square; annula, ring) for the parent is suggested, abbreviated TMS4-TBQ, which Hopf and co-workers recently summarized two synthetic strategies to the quadrANNulene core.
Abstract: The presence of nonhexagonal rings in an otherwise graphitic lattice induces curvature. Pentagons are common—twelve pentagons surrounded by hexagons make up C60. Larger rings are present in Stone–Wales defects, and the polyhedral formula of Euler mandates their existence in carbon nanotube Y-junctions. Except for a single, partially saturated example, four-membered rings in graphitic structures are, however, unknown. The smallest examples of these graphitic structures are the [n]circulenes, wherein a central n-sided polygon is surrounded by n-fused benzenoid rings. [7]Circulene, first prepared by Yamamoto, Nakazaki, and coworkers in 1983, is saddle shaped. [6]Circulene, or coronene, is the trivial, planar case, and it was first synthesized by Scholl andMeyer in 1932 but also occurs naturally. [5]Circulene, or corannulene, comprises 1/3 of the C60 skeleton and has been intensely studied, and it was first prepared by Lawton and Barth in 1971. Whereas a few pioneering attempts have been reported, [4]circulene has never been synthesized before. We report herein the preparation and characterization of a stable [4]circulene. By analogy with Lawton s naming of corannulene (Latin: cor, heart; annula, ring), we suggest the trivial name quadrannulene (Latin: quadra, square; annula, ring) for the [4]circulene parent. Hence, we name this derivative 1,8,9,16-tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene, abbreviated TMS4-TBQ. The IUPAC name and atom numbering are given in the Supporting Information. Our unoptimized five-step synthesis (Scheme1) provides TMS4-TBQ in very low yield. Hopf and co-workers recently summarized two synthetic strategies to the quadrannulene core: making the four-membered ring from [2,2]-paracyclo-

84 citations

Journal ArticleDOI
TL;DR: In this article, different carbon nanostructures including multi-walled carbon nanotubes (MWCNTs), graphene nanosheets (G), carbon nanoballs (CNBs) and fullerene nanoparticles (C60) were added to SAE 20W50 engine oil.

84 citations


Network Information
Related Topics (5)
Raman spectroscopy
122.6K papers, 2.8M citations
90% related
Carbon nanotube
109K papers, 3.6M citations
90% related
Oxide
213.4K papers, 3.6M citations
89% related
Graphene
144.5K papers, 4.9M citations
89% related
Nanoparticle
85.9K papers, 2.6M citations
88% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023542
20221,244
2021366
2020346
2019411
2018420