Effects of electrophoretically deposited Carbon Nanofibers on the interface of single carbon fibers embedded in epoxy matrix

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dc.contributor.advisor Minaie, Bob
dc.contributor.author Schaefer, Joseph Daniel
dc.date.accessioned 2011-11-23T14:51:18Z
dc.date.available 2011-11-23T14:51:18Z
dc.date.copyright 2011 en
dc.date.issued 2011-05
dc.identifier.other t11037
dc.identifier.uri http://hdl.handle.net/10057/3973
dc.description Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering. en_US
dc.description.abstract In this work, electrophoretic deposition (EPD) was used to deposit carboxylic acidfunctionalized carbon nanofibers (O-CNFs) and amine-functionalized carbon nanofibers (ACNFs) on the surface of single carbon fibers. Using the fiber fragmentation technique, the stress transfer at the single fiber interface was characterized by determining the interfacial shear strength (IFSS) for different fiber surface treatments. For the O-CNF investigation, samples for sized, unsized, O-CNF deposited sized, and O-CNF deposited unsized carbon fibers were tested. The A-CNF investigation was completed for sized carbon fibers acting as the anode during EPD for single and double concentrations of CNFs in water. Additionally, results for fibers acting as both the anode and cathode during a two-stage A-CNF deposition process are provided. Finally, the effects of EPD were investigated by testing fibers acting as the cathode or anode in water without the presence of O-CNFs or A-CNFs. Weibull analyses of single fiber tensile failures were performed to account for scale effects along the fiber length and support IFSS estimation. This research was aimed at obtaining a fundamental understanding of how functionalized CNF addition, EPD electric field setup, and fiber sizing affected IFSS and fiber surface morphology. Additionally, the processing effects on single fiber tensile strength were determined. It was shown that removing the sizing decreased the IFSS by 27%. One-stage addition of O-CNFs to the unsized interface increased the IFSS by 15% over the base sized fiber and 56% compared to the unsized fibers. One-stage cathodic deposition of O-CNFs on the single fiber surface led to the greatest IFSS increase of 215%. This IFSS increase is attributed to enhancement of surface roughness and surface area created by addition of the O-CNFs to the carbon fiber surface. en_US
dc.format.extent xiii, 76 p. en
dc.language.iso en_US en_US
dc.publisher Wichita State University en_US
dc.rights © Copyright 2011 by Joseph Daniel Schaefer. All rights reserved en
dc.subject.lcsh Electronic dissertations en
dc.title Effects of electrophoretically deposited Carbon Nanofibers on the interface of single carbon fibers embedded in epoxy matrix en_US
dc.type Thesis en_US

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