Influence of Ultrasonic Treatment on Electromagnetic Characteristics of Composites Based on Multiwall Carbon Nanotubes at Microwave Frequencies

Abstract

There is a growing demand for light and radar absorbing materials in both commercial and military purposes. In this paper, microwave properties of polimer based composites containing multiwalled carbon nanotubes used as fillers have been analyzed. The multiwall carbon nanotubes used in the composite were about 9.4 nm in diameter. The results show that the ultrasonic treatment modifies the dielectric properties of the composite. Both real and imaginary permittivity of composites is 2 times more than ordinary example after sonicating for 3 minutes.

Continuous wave THz imaging of multi-walled carbon nanotubes polymer composites

“…Long-term ultrasonic treatment improves material homogeneity. However, as was shown in [20], when the ultrasonic treatment time was increased over 3 minutes, the fact of MWCNTs shortening due to their destruction, as well as a decrease in the dielectric permittivity of the material, was observed. Based on these observations, it was decided to limit the maximum time of ultrasonic treatment to 5 minutes.…”

Influence of Ultrasonic Treatment on Electromagnetic Characteristicsof Composites Based on Multiwall Carbon Nanotubes at Wide Range of Frequencies (100 Hz – 258 GHz)

“…For the production of mixture for experimental samples 1 wt.% of MWCNT was added to 99 wt. % of lacquer [5]. The mixture was placed in a glass beaker.…”

“…Application of nanotubes as independent materials is difficult, they possess of volatility and low bulk density. For this reason, nanotubes are used as filler in the manufacture polymer composite, which can be used to solve problems of electromagnetic compatibility [3][4][5].…”