نویسنده
Nanotechnology, Emam Ali University
چکیده
در این تحقیق به بررسی خواص ساختاری، مغناطیسی و جذب امواج مایکروویو نانوکامپوزیتهای جاذب ساخته شده از طریق پوششدهی الیاف کربنی (CFs) با نانوذرات مگنتیت (Fe3O4) نوسط رسوبدهی الکتروفورتیک (EPD) بهبود یافته،پرداخته شده است. ابتدا نانوذرات مگنتیت به روش هم‌رسوبی تهیه شده و سپس به وسیلهی فرآیند رسوبدهی الکتروفورتیک بهبود یافته روی CFs پوشش داده شد. بررسی خواص مغناطیسی نشان داد که مقادیر مغناطش اشباع و وادارندگی نانوپودر مگنتیت پس از انجام فرآیند رسوبدهی الکتروفورتیک به ترتیب از 72.3 به emu/g 33.1 از 4.9 به Oe 168 برای نانوکامپوزیت مگنتیت/الیاف کربنی میرسد. نتایج آزمون جذب امواج مایکروویو در محدودهی بسامدی 8.2 تا GHz 12.4 نشان داد که میزان جذب موج نانوکامپوزیت مگنتیت/الیاف کربنی به‌شدت به ضخامت آن بستگی دارد. مقدار بیشینهی جذب موجی در حدود dB 10.2- در GHz 10 با پهنای باند جذب موثری در حدود GHz 2 برای نمونهی با ضخامت 2 میلیمتر به‌دست آمد.
کلیدواژه‌ها
عنوان مقاله [English]
Synthesis of the Microwave Absorber Fe3O4/CFs Nanocomposite Via Electrophoretic Deposition With a Wide Effective Absorption Bandwidth
چکیده [English]
In this study, the structural, magnetic and microwave absorption properties of a microwave absorber composite fabricated through electrophoretic deposition (EPD) of Fe3O4 nano-particles on carbon fibers (CFs) were studied. Firstly, co-precipitation method was employed to synthesize the Fe3O4 nano-particles. Then, these as-synthesized Fe3O4 nano-particles were successfully deposited on CFs using a modified EPD process. The measured magnetic properties of the as-synthesized Fe3O4 nano-powder and the Fe3O4/CFs nano-composite showed that the saturation magnetization of the bare Fe3O4 was decreased from 72.3 to 33.1 emu/g for the Fe3O4/CFs nano-composite and also its corecivity was increased from 4.9 to 168 Oe for the nano-composite. The results of reflection loss (RL) measurements in the 8.2- 12.4 GHz frequency range indicated that the RL of Fe3O4/CFs nano-composites are significantly influenced by their thickness. The maximum RL value of -10.2 dB at 10 GHz with an effective absorption bandwidth about 2 GHz was obtained for the sample with the thickness of 2 mm.
کلیدواژه‌ها [English]
- Carbon Fibers
- Microwave absorption
- nano-composite
- Fe3O4 nano-particles
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