کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475458 991119 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chemical oxidation of residual carbon from ZnAl2O4 powders prepared by combustion synthesis
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Chemical oxidation of residual carbon from ZnAl2O4 powders prepared by combustion synthesis
چکیده انگلیسی

The removal of carbon residue from ZnAl2O4 nanopowders by annealing at 500–800 °C leads to a decrease of specific surface area from 228.1 m2/g to 47.6 m2/g. At the same time, the average crystallite size increased from 5.1 nm to 14.9 nm. In order to overcome these drawbacks, a new solution for removing the carbon residue has been suggested: chemical oxidation using hydrogen peroxide. In terms of carbon removal, a H2O2 treatment for 8 h at 107 °C proved to be equivalent to a heat treatment of 1 h at 600 °C. The benefits of chemical oxidation over thermal oxidation were obvious. The specific surface area was much larger (188.1 m2/g) in the case of the powder treated with H2O2. The average crystallite size (5.8 nm) of ZnAl2O4 powder treated with H2O2 was smaller than the crystallite size (8.2 nm) of the ZnAl2O4 powder annealed at 600 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 32, Issue 8, July 2012, Pages 1605–1611
نویسندگان
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