Document Type : Research Paper

Authors

1 Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

3 Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

Abstract

In this study, ultrasonic bath and milling processes were used to synthesis epoxy resin-multiwalled carbon nanotubes (MWCNT) composite, and their effect on the absorption of magnetic waves was investigated using the Vector Network Analyzer (VNA) test. The effect of the concentration of MWCNT used to attract the wave's magnetic part in the epoxy resin matrix is also investigated. This study showed that the optimal amount of MWCNT in this epoxy resin-MWCNT composite was about 5 wt.% for the ultrasonic bath method, while it was around 15 wt% for the milling method. The ultrasonic bath caused the reflection losses (RL) value reaches to about -25 dB in the range of 9 to 11 GHz. The results of the VSM test showed that the composite produced from epoxy resin and MWCNT is a soft magnetic material. Also, the sample produced in the ultrasonic bath process has a higher magnetic saturation than the milling process, which causes it to absorb more electromagnetic waves.

Keywords

Main Subjects

  1.  

    1. Conclusions

    According to the results obtained from the discussion and conclusion, it can be reported that:

    1- The presence of compounds with two bands can help absorb the electrical part of the wave to absorb electromagnetic waves. In addition, the ultrasonic bath makes the MWCNT segregated more conveniently compared to the milling process.

    2- Due to the absence of steel balls used in the milling process, the MWCNTs are not damaged in the ultrasonic intermediate process. Moreover, the production sample with the intermediate milling process causes areas with carbon nanotube agglomeration to be created.

    3- The presence of carbon nanotubes that experienced mechanical damage and agglomeration reduces the electrical conductivity in the samples, which ultimately reduces the absorption of electromagnetic waves.

    4- The highest reflection losses (RL) observed in the sample contains 5 wt.% carbon nanotubes, which were produced via the ultrasonic bath. Also, its maximum RL value range is 11-9 GHz and about -25 dB. Furthermore, the sample produced in the ultrasonic bath process has a higher magnetic saturation than in the milling process, which causes it to absorb more electromagnetic waves.

     

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