Nano Archive

Hierarchical composites reinforced with carbon nanotube grafted fibers: The potential assessed at the single fiber level

Qian, Hui and Bismarck, Alexander and Greenhalgh, Emile S. and Kalinka, Gerhard and Shaffer, Milo S. P. (2008) Hierarchical composites reinforced with carbon nanotube grafted fibers: The potential assessed at the single fiber level. CHEMISTRY OF MATERIALS, 20 (5). pp. 1862-1869.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm702782j

Abstract

The feasibility of reinforcing conventional carbon fiber composites by grafting carbon nanotubes (CNTs) onto the fiber surface has been investigated. Carbon nanotubes were grown on carbon fibers using the chemical vapor deposition (CVD) method. Iron was selected as the catalyst and predeposited using the incipient wetness technique before the growth reaction. The morphology of the products was characterized using scanning electron microscopy (SEM), which showed evidence of a uniform coating of CNTs on the fiber surface. Contact angle measurements on individual fibers, before and after the CNT growth, demonstrated a change in wettability that can be linked to a change of the polarity of the modified surface. Model composites based on CNT-grafted carbon fibers/epoxy were fabricated in order to examine apparent interfacial shear strength (IFSS). A dramatic improvement in IFSS over carbon fiber/epoxy composites was observed in the single fiber pull-out tests, but no significant change was shown in the push-out tests. The different IFSS results were provisionally attributed to a change of failure mechanism between the two types of tests. supported by fractographic analysis.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nano objects
ID Code:560
Deposited By:IoN
Deposited On:20 Jan 2009 12:16
Last Modified:20 Jan 2009 12:16

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