Mechanical Engineering ETDs

Author

Daniel Garcia

Publication Date

8-27-2009

Abstract

Carbon nanofilaments were grown on the surface of microscale carbon-fibers at relatively low temperature using palladium as a catalyst to create multiscale fiber reinforcing structures with potential applications in structural composites. Employing a relatively new method, in which carbon structures are grown from fuel rich combustion mixtures on certain catalytic metals, multiscale filament structures were grown from ethylene/oxygen mixtures at 550 °C on commercial PAN and pitch carbon fibers. The filaments grew in a bimodal size distribution. Relative short, densely spaced nanofilaments (ca. 10 nm diameter), and a slightly less dense layer of larger (ca. 100 nm diameter) faster growing fibers (ca. 10 microns/hr) were found to exist together to create a unique multiscale structure. All analytical techniques employed indicated poor crystallinity of the produced filaments.

Keywords

Nanofibers--Design and construction, Carbon fibers, Fibrous composites--Materials.

Degree Name

Mechanical Engineering

Level of Degree

Masters

Department Name

Mechanical Engineering

First Advisor

Al-Haik, Marwan

First Committee Member (Chair)

Phillips, Jonathan

Second Committee Member

Luhrs, Claudia

Sponsors

Defense Threat Reduction Agency

Document Type

Thesis

Language

English

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