B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 18/00 (2006.01) B01J 21/18 (2006.01) B32B 5/16 (2006.01) C01B 31/00 (2006.01) C04B 35/52 (2006.01) C04B 35/622 (2006.01) C04B 35/83 (2006.01)
Patent
CA 2523911
Composites of single-walled carbon nanotubes (SWNTs) and a ceramic support (e.g., silica) comprising a small amount of catalytic metal, e.g., cobalt and molybdenum, are described. The particle comprising the metal and ceramic support is used as the catalyst for the production of the single-walled carbon nanotubes. The nanotube-ceramic composite thus produced can be used "as prepared" without further purification providing significant cost advantages. The nanotube-ceramic composite has also been shown to have improved properties versus those of purified carbon nanotubes in certain applications such as field emission devices. Use of precipitated and fumed silicas has resulted in nanotube-ceramic composites which may synergistically improve the properties of both the ceramic (e.g., silica) and the single-walled carbon nanotubes. Addition of these composites to polymers may improve their properties. These properties include thermal conductivity, thermal stability (tolerance to degradation), electrical conductivity, modification of crystallization kinetics, strength, elasticity modulus, fracture toughness, and other mechanical properties. Other nanotube-ceramic composites may be produced based on AL2O3, MgO and ZrO2, for example, which are suitable for a large variety of applications.
L'invention concerne des composites à nanotubes de carbone à paroi unique et support céramique (par exemple, silice) comprenant une faible quantité de métal catalytique, du type cobalt et molybdène. La particule renfermant le métal et le support céramique sert de catalyseur pour la productiuon des nanotubes. Ce composite peut servir <= tel quel >= sans purification ultérieure, ce qui offre des avantages financiers importants. Il a aussi des propriétés améliorées par rapport aux nanotubes en carbone purifiés, dans certaines applications comme les dispositifs à émission de champ. L'utilisation de silices précipitées et fumées donne un composite nanotube-céramique procurant une amélioration synergique des propriétés, à la fois pour la céramique (par exemple, silice) et les nanotubes considérés. L'adjonction d'un tel composite à des polymères peut en améliorer les propriétés. Ces propriétés sont : conductivité thermique, modification de la cinétique de cristallisation, résistance, module d'élasticité, résistance à la cassure, et autres propriétés mécaniques. On peut produire d'autres composites nanotube-céramique à base de AL¿2?O¿3?, MgO et de ZrO¿2?, par exemple, qui se prêtent à n large éventail d'applications.
Balzano Leandro
Resasco Daniel E.
Balzano Leandro
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Resasco Daniel E.
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