درصد پراکندگی و سرباره به‌عنوان شاخصی ساده از میزان آمورف آرایه‌های نانولوله کربنی

نویسندگان

گروه مهندسی شیمی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

نانولوله‌های کربنی دارای ناخالصی‌هایی بوده و یکی از روش‌های خالص‌سازی آنها، آمورف‌زدایی است. در این پژوهش برای اولین بار از محلول پیرانا با نسبت 1:3 (30 میلی‌لیتر سولفوریک اسید + 10 میلی‌لیتر هیدروژن پراکسید) با زمان فرآوری 30 دقیقه و مایکروویو به‌منظور آمورف‌زدایی از آرایه نانولوله کربنی آمورف‌دار استفاده شد. از امواج فراصوت به‌منظور پراکندگی نانولوله‌های کربنی اولیه و آمورف‌زدایی شده در آب و از سانتریفیوژ برای جداسازی ذرات درشت استفاده شد. برای بررسی آمورف‌زدایی، روش‌های جدیدی مانند درصد پراکنش یافته و درصد سرباره بررسی شد. مشخص شد با افزایش زمان فراصوت از صفر تا 50 دقیقه، درصد پراکنش یافته آرایه فرآوری شده بیشتر (حدود 47 درصد) و درصد سرباره آرایه خالص کمتر (حدود 20 درصد) می‌شود. این نتایج به کاهش آمورف مربوط می‌شود. با انجام آزمون توزین حرارتی، مشخص شد که نتایج حاصل از آزمون با نتایج حاصل از روش‌های تعیین درصد پراکنش یافته و سرباره توافق دارند.

کلیدواژه‌ها

عنوان مقاله [English]

DISPERSION AND FLOATING PERCENTAGE AS A SIMPLE INDICATOR OF THE AMOUNT OF AMORPHOUS CARBONS IN CARBON NANOTUBE ARRAYS

نویسندگان [English]

  • F. Delshad
  • M. Maghrebi
  • M. Baniadam
Ferdowsi University of Mashhad, Faculty of Engineering, Department of Chemical Engineering
چکیده [English]

Carbon nanotubes contain impurities and deamorphization is one of the methods of their purification. In this study, for the first time, a solution of piranha with a ratio of 3:1 (30 ml sulfuric acid + 10 ml hydrogen peroxide) as well as microwave irradiation with processing time of 30 minutes were used to remove amorphous carbon from the nanotube arrays. Ultrasonication was performed to disperse pristine and purified carbon nanotubes in water and centrifugation was performed to separate large particles. To assess the removal of amorphous carbon, new characterization methods such as dispersed percent and floating percent were used. It was observed that with increase in the ultrasonication time (from 0 to 50 minutes), the dispersed percentage of treated arrays was increased (about 47%), while the floating percentage of pure array decreased (about 20%). These results are ascribed to the removal of amorphous carbon. The results of the thermo gravimetric analysis (TGA) were in good agreement with the results obtained from the newly proposed characterization methods.

کلیدواژه‌ها [English]

  • Carbon nanotube array
  • amorphous
  • Piranha
  • microwave
  • Removal of amorphous carbon

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مواد پیشرفته در مهندسی
دوره 40، شماره 2
شهریور 1400
صفحه 127-140

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