Journal ArticleDOI
Helical microtubules of graphitic carbon
TLDR
Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.Abstract:
THE synthesis of molecular carbon structures in the form of C60 and other fullerenes1 has stimulated intense interest in the structures accessible to graphitic carbon sheets. Here I report the preparation of a new type of finite carbon structure consisting of needle-like tubes. Produced using an arc-discharge evaporation method similar to that used for fullerene synthesis, the needles grow at the negative end of the electrode used for the arc discharge. Electron microscopy reveals that each needle comprises coaxial tubes of graphitic sheets, ranging in number from 2 up to about 50. On each tube the carbon-atom hexagons are arranged in a helical fashion about the needle axis. The helical pitch varies from needle to needle and from tube to tube within a single needle. It appears that this helical structure may aid the growth process. The formation of these needles, ranging from a few to a few tens of nanometres in diameter, suggests that engineering of carbon structures should be possible on scales considerably greater than those relevant to the fullerenes. On 7 November 1991, Sumio Iijima announced in Nature the preparation of nanometre-size, needle-like tubes of carbon — now familiar as 'nanotubes'. Used in microelectronic circuitry and microscopy, and as a tool to test quantum mechanics and model biological systems, nanotubes seem to have unlimited potential.read more
Citations
More filters
Journal ArticleDOI
Carbon nanotubes as assisted matrix for laser desorption/ionization time-of-flight mass spectrometry.
TL;DR: It has been found that carbon nanotubes can transfer energy to the analyte under laser irradiation, which makes analytes well desorbed/ionized, and the interference of intrinsic matrix ions can be eliminated.
Journal ArticleDOI
Alignment of Carbon Nanotubes under Low Magnetic Fields through Attachment of Magnetic Nanoparticles
Miguel A. Correa-Duarte,Marek Grzelczak,Verónica Salgueiriño-Maceira,Michael Giersig,Luis M. Liz-Marzán,Michael Farle,Karl Sierazdki,Rodolfo E. Diaz +7 more
TL;DR: The volume magnetization of the particle coated MWNTs is found to be enhanced by 17% compared to the pure particles in a powder indicating that either the adsorption process onto the CNTs changes the particle magnetization, or the MW NTs carry an intrinsic magnetization due to remaining Ni used as a catalyst for the growth process.
Journal ArticleDOI
Functionalization of Single-Walled Carbon Nanotubes with Polystyrene via Grafting to and Grafting from Methods
TL;DR: In this paper, single-walled carbon nanotubes (SWNT) were functionalized with polystyrene (PSt) by grafting to and grafting from methods.
Journal ArticleDOI
Magnetic removal of dyes from aqueous solution using multi-walled carbon nanotubes filled with Fe2O3 particles.
TL;DR: The Fe2O3 nanoparticles have been introduced into the multi-walled carbon nanotubes (MWCNTs) via wet chemical method and the resulting products are characterized by TEM, EDX, XRD and VSM, leading to the removal of dyes from polluted water.
Journal ArticleDOI
Advanced drug delivery systems: Nanotechnology of health design A review
Javad Safari,Zohre Zarnegar +1 more
TL;DR: This review describes the advanced drug delivery systems based on micelles, polymeric nanoparticles, and dendrimers and emphasizes the main requirements for developing new nanotech-nology-based drug delivery system.
References
More filters
Journal ArticleDOI
C 60 : Buckminsterfullerene
Harold W. Kroto,Harold W. Kroto,James R. Heath,Sean C. O'Brien,Robert F. Curl,Richard E. Smalley +5 more
TL;DR: In this article, the authors proposed a truncated icosahedron, a polygon with 60 vertices and 32 faces, 12 of which are pentagonal and 20 hexagonal.
Journal ArticleDOI
Solid C60: a new form of carbon
TL;DR: In this article, a new form of pure, solid carbon has been synthesized consisting of a somewhat disordered hexagonal close packing of soccer-ball-shaped C60 molecules.
Journal ArticleDOI
Filamentous growth of carbon through benzene decomposition
TL;DR: Carbon fibres have been prepared by pyrolysing a mixture of benzene and hydrogen at about 1100°C and have been studied by high resolution electron microscopy.
Journal ArticleDOI
Cohesive mechanism and energy bands of solid C60.
Susumu Saito,Atsushi Oshiyama +1 more
TL;DR: In this paper, the authors present microscopic total energy calculations which provide a cohesive property and electronic structures of a new form of solid carbon, the face-centered-cubic crystal (fcc ${\mathrm{C}}_{60}$).
Journal ArticleDOI
Growth, Structure, and Properties of Graphite Whiskers
TL;DR: Graphite whiskers have been grown in a dc arc under a pressure of 92 atmospheres of argon and at 3900°K as discussed by the authors, with recoverable lengths up to 3 cm. They are embedded in a solid matrix of graphite which builds up by diffusion of carbon vapor from the positive to the negative electrode.