Non-Linear Thermal Conductivity Enhancement in Nanocomposites with Aligned-Cnt Implementation
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Wardle_Non-linear thermal.pdf
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Author(s)
Yamamoto, N.
Duong, Hai M.
Wardle, Brian L.
Marconnet, Amy Marie
Goodson, Kenneth E.
Date Issued
August 2011
Journal
Proceedings of the 18th International Conference on Composite Materials (ICCM18)
Publisher
Institute of Materials, Minerals and Mining
Citation
Yamamoto, N., A. M. Marconnet, H. M. Duong; K. E. Goodson, and B. L. Wardle. "Non-Linear Thermal Conductivity Enhancement in Nanocomposites with Aligned-Cnt Implementation." 18th International Conference on Composite Materials (ICCM18), August 21-26, 2011, Jeju Island, South Korea.
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Author's final manuscript
Abstract
Carbon nanotubes (CNTs) have been expected to enhance thermal conductivity in various materials including composites, for applications such as thermal interface materials. However, the thermal properties of bulk CNTs and CNT composites tend not to achieve the high values of individual nanotubes. Factors that cause such scaling effects include CNT morphology (length, alignment, entanglement, etc.), and inter-CNT/CNTmedium boundary properties. It is critical to evaluate and minimize these effects. However, structure-property relationships are not yet well understood, and thus effective use of CNTs has not been achieved for the majority of currently existing CNT polymer composites.
In this work, consistent CNT samples with well-controlled morphology were fabricated by embedding aligned CNTs in polymer to create aligned CNT polymer nanocomposites (A-CNTPNCs), as shown in Figure 1. A-CNT-PNCs were thoroughly evaluated for their anisotropic thermal properties, and a non-linear increasing trend of thermal conductivity has been observed with increasing CNT volume fraction (vCNT). This newly identified trend was understood through comparison with both analytical and numerical models of the transport behavior. Such understanding can help utilize CNTs in the most effective ways for tailoring thermal conductivities for bulk composite and other applications.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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