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Title: Structure, properties and treatments of carbon nanotube fibres
Author: Vilatela García, Juan José
ISNI:       0000 0004 2706 9796
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2009
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Carbon nanotubes (CNTs) possess exceptional mechanical, thermal and electrical properties along their main axis, superior to those of most materials. These can be exploited on a macroscopic scale by assembling the CNTs into a fibre with the nanotubes preferentially oriented parallel to each other and to the fibre axis. CNT fibres can be produced continuously, directly from the gas phase during CNT synthesis by chemical vapour deposition (CVD), and spun at rates of up to 70 m/min. Their combination of outstanding mechanical, electrical and thermal properties and low density (1 g/cm3) makes CNT fibres a potential candidate for high-performance applications. The fibre specific strength and stiffness are typically 1 GPa/SG and 50 GPa/SG, respectively; however, at small gauge lengths (> 2mm) they also show values of 6-9 GPa/SG strength and 180-390 GPa/SG stiffness. The electrical conductivity of the CNT fibres is approximately 8 x 10 5 S/m and their thermal conductivity of the order of 50 W/mK. These properties derive from the long length, high alignment and efficient packing of the nanotubes in the fibre. Further improvements to the fibre structure and properties at long gauge lengths are possible through removal of impurities from the fibre by annealing.
Supervisor: Windle, Alan Sponsor: CONACYT (Mexico)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: CNT ; fibre ; carbon ; nanotube