| Summary: | 碩士 === 元智大學 === 機械工程學系 === 101 === In the past decades, composite materials have become a popular topic in materials industry in view of their unique properties. In the present research, the thermal conductivities of composites predicted by Eshelby and Mori-Tanaka models have been derived in a systematic manner. Important microstructural parameters, such as aspect ratio and constituent properties, are included in the present models and analytic estimates are obtained. The experimental data published in literatures are then compared with the present predictions for benchmarking. The discrepancy between experimental data and present model predictions is significant for most of the cases benchmarked.
The final part of the present work is the derivation of dielectrophoresis theory, which is applied to align carbon nanotubes in composites. When carbon nanotubes are polarized by a non-uniform electric field, a dipole force and a dipole torque are developed and exerted on carbon nanotubes. While the carbon nanotubes are polarized, they rotate in the medium and consequently are aligned.
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