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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin12265225452021-08-03T06:12:52Z Carbon Nanocomposites for Industrial Applications Maheshwari, Gunjan Machines and structures are often incredibly complex having hundreds of individual components. Although the performance and reliability of each component is high, the performance and reliability of the machine may be less than desired due to the sheer number of components that may not be optimally designed or that may be degraded. If one component fails, the machine may break down, or the performance may become unacceptable. One approach to improve and maintain the performance of machines is to use nanocomposite materials to make components that are better performing and that self-monitor degradation far enough in advance of failure that the component can be replaced. This approach is described as Industrial Health Monitoring. To address the need for nanocomposite materials having multifunctional attributes, this thesis explores the use of carbon nanoparticles like Carbon Nanotubes (CNT), Carbon Nanospheres Chains (CNSC) and Carbon Nanofibers (CNF) to develop versatile carbon nanocomposite materials. These nanocomposite materials have electrochemical impedance, piezoresistive, increased stiffness, good thermal conductivity, and weak magnetic properties that have been found to be useful for industrial applications. A novel carbon nanoparticle, CNSC, has been characterized and shown to have excellent mechanical, thermal, and electrical properties plus weak magnetic properties produced by post processing the material. Carbon nanocomposites based on host materials like epoxy, elastomers, cement, water, spray on sensors, and ice have been processed and fabricated successfully. Preliminary testing shows a change in electrical conductivity due to strain that can be used to predict structural damage and abnormalities. Various problems associated with development of nanocomposite materials including dispersion of nanoparticles in a polymer base material are discussed, including a way to improve the materials through surface plasma functionalization. Since nanocomposite materials have piezoresistivity and electrochemical properties, it may be possible to monitor the health and detect changes due to deterioration of large complex structures. A novel application of long CNT is to improve the matrix dominated properties of a conventional fiber reinforced polymeric laminated composite material. A full scale 3-D numerical simulation is performed based on a square representative volume element model to predict the elastic properties of a composite material with CNT grown on the carbon fibers. Results are compared with those from a micromechanics model. This modeling effort acts as a precursor for the modeling and simulation of general nanocomposite materials. From a commercial perspective, carbon nanocomposite materials are poised to enhance the performance and reliability of common industrial machines without significantly increasing their cost. 2008 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226522545 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226522545 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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Maheshwari, Gunjan
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Maheshwari, Gunjan
Carbon Nanocomposites for Industrial Applications
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| author_facet |
Maheshwari, Gunjan
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| author_sort |
Maheshwari, Gunjan
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| title |
Carbon Nanocomposites for Industrial Applications
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| title_short |
Carbon Nanocomposites for Industrial Applications
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| title_full |
Carbon Nanocomposites for Industrial Applications
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| title_fullStr |
Carbon Nanocomposites for Industrial Applications
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Carbon Nanocomposites for Industrial Applications
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carbon nanocomposites for industrial applications
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University of Cincinnati / OhioLINK
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2008
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http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226522545
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AT maheshwarigunjan carbonnanocompositesforindustrialapplications
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1719432884225310720
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