摘要:
There is disclosed a material comprising an assembly of at least one spun yarn, comprising: synthetic inorganic fibers, such as carbon, metal, oxides, carbides or alloys or combinations thereof, wherein a majority of the fibers: (a) are longer than 300 μm, (b) have a diameter ranging from 0.25 nm and 700 nm, and (c) are substantially crystalline, wherein the yarn has substantial flexibility and uniformity in diameter. A method of making the material is also disclosed. In one embodiment, the method comprises spinning yarn by pulling fibers from a bulk material with at least one spinner that has real time feedback controls.
摘要:
La présente invention se rapporte à un procédé de renforcement de l'adhésion de NTC à la surface d'un matériau, comprenant les étapes suivantes réalisées sous un courant de gaz inerte(s) éventuellement en mélange avec de l'hydrogène : (i) chauffage dans une enceinte réactionnelle du matériau comprenant à sa surface des NTC, à une température allant de 500°C à 1100°C; (ii) introduction dans ladite enceinte, d'une source de carbone constituée d'acétylène et/ou de xylène, en absence de catalyseur; (iii) exposition du matériau chauffé à la source de carbone pendant une durée suffisante pour obtenir une couche de carbone d'épaisseur contrôlée à la surface dudit matériau et desdits NTC le recouvrant telle que représentée sur la figure ci- dessous; (iv) récupération éventuellement après refroidissement du matériau ainsi recouvert, à l'issue de l'étape (iii). Elle concerne aussi des renforts hybrides revêtus de carbone et leurs utilisations pour la préparation de matériaux composites structuraux et fonctionnels ou pour la préparation de peintures ou vernis et de fils.
摘要:
The present invention is directed to nanofiber yarns, ribbons, and sheets; to methods of making said yarns, ribbons, and sheets; and to applications of said yarns, ribbons, and sheets. In some embodiments, the nanotube yarns, ribbons, and sheets comprise carbon nanotubes. Particularly, such carbon nanotube yarns of the present invention provide unique properties and property combinations such as extreme toughness, resistance to failure at knots, high electrical and thermal conductivities, high absorption of energy that occurs reversibly, up to 13% strain-to-failure compared with the few percent strain-to-failure of other fibers with similar toughness, very high resistance to creep, retention of strength even when heated in air at 450°C for one hour, and very high radiation and UV resistance, even when irradiated in air. Furthermore these nanotube yarns can be spun as one micron diameter yarns and plied at will to make two-fold, four-fold, and higher fold yarns. Additional embodiments provide for the spinning of nanofiber sheets having arbitrarily large widths. In still additional embodiments, the present invention is directed to applications and devices that utilize and/or comprise the nanofiber yarns, ribbons, and sheets of the present invention.
摘要:
The present invention provides methods and tools for directed assembly of nanoelements across a large area using a nanosubstrate. The nanosubstrate has a substrate layer, an adhesive layer, a conductive layer, and an insulating layer that is interrupted by one or more nanotrenches or nanowells having a width of at least 20 nm. The nanosubstrate allows the rapid assembly of linear assemblies and arrays of single walled carbon nanotubes and nanoparticles by DC electrophoresis. The density of nanoelements assembled can be controlled by varying the voltage and trench size. Functionalized nanoparticles can be assembled into arrays useful, e.g., as biosensors.
摘要:
A method of protecting an article from a downhole environment comprises growing carbon nanotubes on a surface of a substrate via a chemical vapor deposition process; the carbon nanotubes having a first end formed on the surface of the substrate and a second end extending away from the substrate; filling the spaces among the carbon nanotubes with a metallic material or a polymeric material forming a coated article; and exposing the coated article to a downhole environment.
摘要:
Described herein are suspensions of helical polycarbodiimide polymers that 'cloak' nanotubes, thereby effecting control over nanotube emission, providing a new mechanism of environmental responsivity, and enabling precise control over sub-cellular localization. The helical polycarbodiimide polymers described herein are water soluble, easily modifiable, and have unique architectures that facilitate their application in radiopharmaceutical delivery and imaging methods, in therapeutics and therapeutic delivery methods, and their use as sensors - both in conjunction with carbon nanotubes, and without nanotubes.
摘要:
Embodiments of the present disclosure are directed to carbon-containing composites which are suitable for use as electrodes in electrochemical systems. The composites are formed from a scaffold of graphene and carbon nanotubes. Graphene flakes form a plurality of generally planar sheets (e.g., extending in an x-y plane) separated in the direction of a composite axis (e.g., along a z-axis) and approximately parallel to one another. The carbon nanotubes extend between the graphene sheets and at least a portion of the carbon nanotubes are aligned in approximately the same direction, at a defined angle with respect to the composite axis. At least a portion of the scaffold is embedded within a porous carbon matrix (e.g., an activated carbon, a polymer derived graphitic carbon, etc.).
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung mehrwandiger Kohlenstoffnanoröhrchen (60, 70, 80, 90, 100), umfassend folgende Schritte: Vorlage eines Substrats (18, 42) aus Kohlenstoffnanoröhrchen in einem bewegten Bett (27, 45) eines Reaktors (2, 32), Einbringen eines kohlenstoffhaltigen Precursors in das bewegte Bett (27, 45), Reaktion des Precursors in dem bewegten Bett (27, 45) unter geeigneten Prozessbedingungen, die ein graphitisches Abscheiden von Kohlenstoff auf den Kohlenstoffnanoröhrchen des Substrats (18, 42) bewirken, Austrag der Kohlenstoffnanoröhrchen (60, 70, 80, 90, 100) aus dem Reaktor (2, 32). Die Erfindung betrifft auch ein mehrwandiges Kohlenstoffnanoröhrchen (60, 70, 80, 90, 100) aufweisend mindestens eine erste und eine zweite graphenartige Lage (62, 64, 72, 76, 84, 92, 94, 102, 104, 120), wobei die zweite Lage im Querschnitt des Kohlenstoffnanoröhrchens (60, 70, 80, 90, 100) außerhalb der ersten Lage angeordnet ist, wobei eine der beiden Lagen (62, 64, 72, 76, 84, 92, 94, 102, 104, 120) eine erste Dotierung aufweist und die andere der beiden Lagen (62, 64, 72, 76, 84, 92, 94, 102, 104, 120) eine zweite, andersartige Dotierung aufweist oder undotiert ist. Weiterhin betrifft auch ein Kohlenstoffnanoröhrchenpulver.
摘要:
The present disclosure provides a process for synthesizing functionalized multi-walled carbon nanotubes (MWCNTs), comprising: refluxing MWCNTs with an acidic mixture to obtain a acid functionalized MWCNTs; and reacting the acid functionalized MWCNTs with oleyl amine in presence of an organic solvent to obtain an oleylamine derivative of MWCNTs. The present disclosure also provides a process for synthesizing a polycarbosilane coated MWCNT, comprising: mixing polycarbosilane and MWCNTs to obtain a mixture; stirring the mixture in Tetrahydrofuran, in presence of a catalyst under an inert atmosphere, to obtain a reaction mixture; and drying the reaction mixture under vacuum followed by heating to obtain polycarbosilane coated MWCNT's. The present disclosure further provides the application of functionalized MWCNTs as synthesized in accordance with the present disclosure, for use in making photovoltaic devices and the application of polycarbosilane coated MWCNTs as synthesized in accordance with the present disclosure for use in making glass fiber reinforced epoxy composites.