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Scanning electron microscope (SEM) micrographs of (a) aligned coiled carbon nanotubes (CNTs) with nearly identical diameter and pitch. (b) A mixture of linear and coiled CNTs, (c) uniform dispersion of the CNTs obtained through mutual chemical reaction between CNT and RET functional groups, (d) a high resolution image of the coiled CNT-RET nanocomposite.
(a) The X-band frequency variation in the real —left axis and imaginary —right axis permittivity of composites, with CCNT (coiled CNTs), mix (a mixture of coiled and single-walled CNTs), and SWCNT (single-walled CNTs) fillers compared with RET polymer (with a nominal value of permittivity ) (b) the frequency variation in of the CNT composites, with CCNTs, mix, SWCNTs, and multiwalled CNT (MWCNT) fillers compared with RET polymer . The inset shows capacitive coupling between alternate windings of the CCNT, which is absent in a SWCNT.
The frequency variation in the shielding efficiency (SE) of the composites with fillers of (a) the same , and (b) similar diameter.
The geometrical parameters of the fillers (SWCNTs: single-walled CNTs, MWCNTs: multiwalled CNTs, and CCNTs: coiled CNTs) used for the composites. The intrinsic CNT diameter , coil diameter , and the projected and extended length, are indicated along with the A.R.s relevant for describing the electromagnetic properties.
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