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dc.contributor.advisor Barrera, Enrique V.
dc.creatorMoloney, Padraig G.
dc.date.accessioned 2013-03-08T00:36:50Z
dc.date.available 2013-03-08T00:36:50Z
dc.date.issued 2012
dc.identifier.citation Moloney, Padraig G.. "Low electrical resistivity carbon nanotube and polyethylene nanocomposites for aerospace and energy exploration applications." (2012) Diss., Rice University. https://hdl.handle.net/1911/70356.
dc.identifier.urihttps://hdl.handle.net/1911/70356
dc.description.abstract An investigation was conducted towards the development and optimization of low electrical resistivity carbon nanotube (CNT) and thermoplastic composites as potential materials for future wire and cable applications in aerospace and energy exploration. Fundamental properties of the polymer, medium density polyethylene (MDPE), such as crystallinity were studied and improved for composite use. A parallel effort was undertaken on a broad selection of CNT, including single wall, double wall and multi wall carbon nanotubes, and included research of material aspects relevant to composite application and low resistivity such as purity, diameter and chirality. With an emphasis on scalability, manufacturing and purification methods were developed, and a solvent-based composite fabrication method was optimized. CNT MDPE composites were characterized via thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Raman spectroscopy, and multiple routes of electron microscopy. Techniques including annealing and pressure treatments were used to further improve the composites' resulting electrical performance. Enhancement of conductivity was explored via exposure to a focused microwave beam. A novel doping method was developed using antimony pentafluoride (SbF 5 ) to reduce the resistivity of the bulk CNT. Flexible composites, malleable under heat and pressure, were produced with exceptional electrical resistivities reaching as low as 2*10 -6 Ω·m (5*10 5 S/m). A unique gas sensor application utilizing the unique electrical resistivities of the produced CNT-MDPE composites was developed. The materials proved suitable as a low weight and low energy sensing material for dimethyl methylphosphonate (DMMP), a nerve gas simulant.
dc.format.extent 199 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectApplied sciences
Electrical resistivity
Carbon nanotubes
Polyethylene
Nanocomposites
Aerospace
Energy exploration
Nanoscience
Energy
Materials science
dc.title Low electrical resistivity carbon nanotube and polyethylene nanocomposites for aerospace and energy exploration applications
dc.type Thesis
dc.identifier.digital MoloneyP
dc.type.material Text
thesis.degree.department Mechanical Engineering and Materials Science
thesis.degree.discipline Engineering
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy


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