علوم و فناوری کامپوزیت

تولید عایق‌های امواج الکترومغناطیسی نانوکامپوزیتی کارآمد برپایه نانولوله‌های کربنی با روش پخش و جداسازی الکترومکانیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مربی، مهندسی مکانیک، دانشگاه فنی و حرفه ای، تهران.

2 دانشیار، مهندسی مکانیک، دانشگاه تبریز، تبریز.

3 دانشیار، شیمی آلی و بیوشیمی، دانشگاه تبریز، تبریز.

چکیده

این پژوهش در تلاش است تا با بکارگیری روش نوین الکترومکانیکی برای پخش و جداسازی نانولوله‌ها، عایق جاذب الکترومغناطیسی باند X با راندمان بالا و مقرون به صرفه تولید نماید. برای این منظور، نخست نانوکامپوزیت‌هایی با زمینه پلی‌متیل‌متاکریلات با درصدهای بین 0 تا 2 % وزنی از نانولوله‌های کربنی با دو روش الکترومکانیکی و پروب التراسونیک تولید شد. ساختار نمونه‌ها توسط میکروسکوپ الکترونی روبشی و طیف‌نگاری رامان مورد ارزیابی قرار گرفت. همچنین مقاومت الکتریکی نمونه‌ها برای تعیین غلظت آستانه رسانایی اندازه-گیری شد. در گام نهایی ارزیابی‌ها، رفتار الکترومغناطیسی نمونه‌ها مورد بررسی قرار گرفت. نتایج نشان می‌دهند آستانه رسانایی در روش الکترومکانیکی در غلظت وزنی 2/0‌% رخ داده است، در حالی که برای روش التراسونیک این رویداد در غلظت 1‌% مشاهده شد. بر اساس مطالعات میکروسکوپی و طیف‌نگاری رامان، توانایی جداسازی الکترومکانیکی در حفاظت از ساختار و طول نانولوله‌ها، عامل اصلی کاهش 80 درصدی غلظت آستانه رسانش تشخیص داده شد. بررسی خصوصیات الکترومغناطیس نمونه‌ها در آستانه رسانایی نشان می‌دهد که روش الکترومکانیکی علی‌رغم داشتن غلظتی معادل 20‌% روش پروب التراسونیک، عایق‌سازی موثر الکترومغناطیسی dB 38 را ارایه می‌دهد که در مقایسه با روش التراسونیک 16% بیشتر است. البته مزیت روش الکترومکانیکی در مقایسه با سایر روش‌ها، حاکی از امکان تقلیل 25 برابری غلظت و همزمان افزایش میزان جذب از 25 به dB 36 است.

کلیدواژه‌ها

عنوان مقاله [English]

Fabrication of Carbon Nanotubes-Based Efficient Electromagnetic Waves Shields Nanocomposites Using Electro-Mechanically Dispersion Technique

نویسندگان [English]

  • Ayub Karimzad Ghavidel 1
  • Mohammad Zadshakoyan 2
  • Gholamreza Kiani 3

1 Department of Mechanical Engineering, Technical and Vocational University, Tehran, Iran.

2 Department of Manufacturing and Production, University of Tabriz, Tabriz, Iran.

3 Department of Organic and Biochemistry, University of Tabriz, Tabriz, Iran.

چکیده [English]

This research is trying to fabricate an efficient and economical EMIS X-band using Electro-Mechanically Dispersion Technique (EMDT). For this purpose, first, poly-methyl-methacrylate (PMMA)-based nanocomposites produced with the different weight percentages between 0 to 2 %, by two EMDT and ultrasonic probe methods. The structure of samples were evaluated by scanning electron microscope and Raman spectroscopy. The electrical resistivity of samples were also measured to determine percolation threshold. At the final assessments, electromagnetic behavior of the samples were examined. The results shows percolation threshold was occurred at the concentration of 0.2 wt.% in EMDT, while this event was observed at the concentration of 1 wt.% for ultrasonic method. According to the microscopic study and the results of Raman spectroscopy, the ability of EMDT in protecting the structure and length of CNTs was detected as the main factor to decrease 80 % in percolation threshold concentration. The investigation of electromagnetic properties of samples at percolation threshold show that EMDT method, despite having a concentration equal to 20% of the ultrasonic probe method, offers effective EMIS of 38 dB, which is 16% higher than the ultrasonic probe method. However, the advantage of EMDT compared to earlier presented methods relates to reduce 25 times the concentration and simultaneously increasing the absorption from 25 to 36 dB.

کلیدواژه‌ها [English]

  • Electromagnetic waves shields
  • Carbon nanotubes
  • Aspect ratio
  • Electro-Mechanically Dispersion Technique (EMDT)
  • Ultrasonic
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علوم و فناوری کامپوزیت
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آذر 1400
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