Monday, June 19, 2006, 10:00 am — Bldg. 480 conference room
Electromagnetic interference (EMI) shielding materials are important for modern computer and telecommunication technologies, their applications range from commercial and scientific electronic instruments to antenna systems and military electronic devices. The conventional EMI shielding materials are common metals and their composites, while metals have good EMI shielding properties, they have disadvantages such as heavy weight, easy corrosion, and poor processing for shielding materials. Due to the desire for light weight for EMI shielding systems, polymer-based conducting composites are increasingly attractive to overcome the disadvantages of common metals for EMI shielding.
After a brief review of previous EMI shielding materials, this talk will address the fabrication of carbon nanofibers and nanotubes filled polymer nanocomposites; the investigation of their dispersion behavior, structural, electrical and EMI shielding properties in the frequency range of 8.2 – 12.4 GHz (X-band). The carbon nanotubes filled polymer composites were found to be more effective in providing EMI shielding compared to carbon nanofibers filled polymer composites at the same filler loading. Furthermore, carbon nanotubes-polymer composites exhibited high shielding effectiveness at low filler loading, which indicates such carbon nanotube-polymer composites have a potential use for effective EMI shielding materials.
Being lightweight is a key technological requirement for the development of practical EMI shielding systems. Therefore, we demonstrate the fabrication of foam structures to further reduce the weight of carbon nanotube-polymer composites. In this talk, I will introduce a simple preparation routine to form this novel foam structure, and investigate its structural, electrical and EMI shielding properties.
Finally, I will propose some potential sensor applications and space exploration of such conductive and lightweight polymer nanocomposite materials.
Hosted by: Stanislaus Wong
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