Advances in methodologies to characterize complex carbon-based materials by sub-GHz and MID-THz spectroscopies
(2018)
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- Authors
- Supervisors
- Huynen, Isabelle
- Abstract
- Functional and structured materials are currently developed for high power electronics in transportation and aerospace sectors facing size and weight constraints. In this thesis, we develop the EM absorption study concerning the isotropic and anisotropic structures (composites and CNT brushes). These structures show high absorption as a function of frequency, CNT load charge, morphology, and thickness. The optimal values are highly correlated to these parameters. The modification of one parameter will have consequences on the overall absorption, reflection and transmission. As example, a matrix containing 2%CNT in 2mm thickness sample has the best absorption (from 20% to 80%) for PC nanocomposites. Anisotropic structures such as the CNT coating or CNT brushes are considered for anisotropic electromagnetic properties. The laser-machined micro patterns of CNT brushes is an alternative to metallic structures for simultaneously driving EM and heat propagation. The thermal response of the CNT array is observed to be sensitive to the microstructured pattern etched in the CNT brush, and to the mechanical stress induced by an incident air flux. The measurement of additional thermal parameters (emissivity and thermal diffusivity) show that the thermal diffusivity of the PC nanocomposite decreases when the CNT loading rate increases from 5%, 10%, to 15%wt. This behavior can be explained by the thermal barriers, added by the CNT inside the PC.
- Affiliations
Citations
Emplit, A. (2018). Advances in methodologies to characterize complex carbon-based materials by sub-GHz and MID-THz spectroscopies. https://hdl.handle.net/2078.5/47923