کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5438402 1398183 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel synthesis method of nanostructured MgO-coated hollow carbon nanofibers via CO decomposition over Mg/MgO catalyst
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
A novel synthesis method of nanostructured MgO-coated hollow carbon nanofibers via CO decomposition over Mg/MgO catalyst
چکیده انگلیسی

An easy and one-step synthesis method for preparation of oxide-coated carbon nanofibers (CNFs) by Mg/MgO catalyst has been reported. For this purpose, the mixture of Mg (metal) and MgO (fused magnesia) powders were heat treated at 1000 °C under reducing atmosphere of CO gas and the final product was comprehensively characterized by various analytical methods such as X-ray diffractometry, field emission scanning electron microscopy (FE-SEM), transition electron microscopy (TEM) and Raman spectroscopy. The results showed the formation of hollow CNFs with the average diameter and wall thickness of 100 nm and 25 nm, respectively. Furthermore, SEM micrographs have obviously revealed the presence of highly packed MgO nanoparticles (with average particle size of 30 nm) on the outer surface of fibers owing to catalytic reaction of Mg (v) and CO gasses. Considering the superior physical properties of the synthesized oxide-coated material such as great packing, high uniformity as well as the absence of structural defects, oxide-coated CNFs showed considerable enhancement in the oxidation resistance compared to the conventional carbon nanofibers. The synthesized oxide coated CNFs showed a weight loss of less than 5 wt% after exposing to high temperature at oxidative atmosphere highlighting the significant effect of the oxide coating. This effect was confirmed by a thermoanalytical technique using differential scanning calorimeter equipped with the online gas analyzer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 12, 15 August 2017, Pages 9220-9225
نویسندگان
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