摘要:
L'invention concerne un procédé de densification d'une structure poreuse. Ce procédé se caractérise en ce que l'on immerge la structure poreuse (2) dans un hydrocarbure liquide (22) et en ce que l'on chauffe l'ensemble par induction (8) de façon à former, par décomposition de l'hydrocarbure, du carbone ou du graphite pyrolytique pouvant se déposer à l'intérieur des pores de la structure.
摘要:
The invention is directed to a carbon material dispersion, including: a fluorinated carbon material having a fluorinated surface formed by bringing a treatment gas with a fluorine concentration of 0.01 to 100 vol.-% into contact with a carbon material under conditions at 150 to 600 °C; and a dispersion medium in which the fluorinated carbon material is dispersed.
摘要:
Fluorinated graphite fibers comprising an intercalated compound of graphite fibers having a three-dimensional crystal structure in which carbon hexagonal network faces are substantially in parallel with the axis of fibers and oriented in a coaxial manner and fluorine, wherein the length of repeating periods in the direction of C-axis of the crystals coexist within a range from 5 to 24 Å. The fluorinated carbon fibers are manufactured by graphitizing gas phase-grown carbon fibers obtained by thermally decomposing a hydrocarbon compound in a non-oxidative atmosphere under the presence of a catalyst supported on a substrate or bringing ultra-fine metal particles catalyst suspended in a high temperature zone into contact with a hydrocarbon compound, thereby obtaining graphite fibers having a three-dimensional crystal structure in which the carbon hexagonal network faces are substantially in parallel with the axis of fibers and oriented in a coaxial manner and then bringing them into contact with fluorine.
摘要:
The formation of improved intercalated graphitic carbon fibers of further diminished electrical resistivity (i.e., increased electrical conductivity) is made possible. Not only is the specific electrical resistivity of the resulting fibers reduced (e.g., to extremely low levels no greater than that of copper in preferred embodiments), but the desirable tensile properties of the fibers are maintained at a satisfactory level even after intercalation. A carbonaceous fibrous material containing the usual turbostratic graphitic carbon which is derived from an acrylonitrile homopolymer or a closely related copolymer (as defined) is selected and is structurally modified in a manner which has been found to render it particularly suited for intercalation as evidenced by a further reduction in the electrical resistivity of the resulting intercalated fibrous material while retaining other desirable properties. More specifically, the carbonaceous fibrous material (as defined) prior to intercalation with an electron acceptor intercalating agent is modified via an atypical extremely high temperature treatment so as to yield a modified structure which can be evidenced upon wide angle x-ray diffraction analysis, i.e. resolved graphitic Miller index (100) and (101) reflections and the presence of a (112) reflection are observed, which surprisingly has been found capable of subsequently yielding an improved intercalated product having a substantially reduced electrical resistivity. The intercalated product finds utility as an improved lightweight electrical conductor.
摘要:
This invention is directed to making chemical derivatives of carbon nanotubes and to uses for the derivatized nanotubes, including making arrays as a basis for synthesis of carbon fibers. In one embodiment, this invention also provides a method for preparing single wall carbon nanotubes having substituents attached to the side wall of the nanotube by reacting single wall carbon nanotubes with fluorine gas and recovering fluorine derivatized carbon nanotubes, then reacting fluorine derivatized carbon nanotubes with a nucleophile. Some of the fluorine substituents are replaced by nucleophilic substitution. If desired, the remaining fluorine can be completely or partially eliminated to produce single wall carbon nanotubes having substituents attached to the side wall of the nanotube. The substituents will, of course, be dependent on the nucleophile, and preferred nucleophiles include alkyl lithium species such as methyl lithium.
摘要:
An article comprising a nonflammable, carbonaceous structure such as a foam, particle, fibre, film or sheet having a carbon content of greater than 65 percent and an LOI value of at least 40, said carbonaceous structure having a fluorinated surface.
摘要:
To provide a conductive resin composite high in conductivity and moldability and low in electric resistance, intercalation compound composed of graphite fiber (having a three-dimensional crystal structure such that hexagonal net planes of carbon are arranged substantially in parallel to a fiber axis and in annular ring growth fashion) and fluorine or transition element fluoride are dispersed in synthetic resin.
摘要:
Fluorinated graphite fibers comprising an intercalated compound of graphite fibers having a three-dimensional crystal structure in which carbon hexagonal network faces are substantially in parallel with the axis of fibers and oriented in a coaxial manner and fluorine, wherein the length of repeating periods in the direction of C-axis of the crystals coexist within a range from 5 to 24 Å. The fluorinated carbon fibers are manufactured by graphitizing gas phase-grown carbon fibers obtained by thermally decomposing a hydrocarbon compound in a non-oxidative atmosphere under the presence of a catalyst supported on a substrate or bringing ultra-fine metal particles catalyst suspended in a high temperature zone into contact with a hydrocarbon compound, thereby obtaining graphite fibers having a three-dimensional crystal structure in which the carbon hexagonal network faces are substantially in parallel with the axis of fibers and oriented in a coaxial manner and then bringing them into contact with fluorine.