کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
675951 887743 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dependence of size and size distribution on reactivity of aluminum nanoparticles in reactions with oxygen and MoO3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Dependence of size and size distribution on reactivity of aluminum nanoparticles in reactions with oxygen and MoO3
چکیده انگلیسی

The oxidation reaction of aluminum nanoparticles with oxygen gas and the thermal behavior of a metastable intermolecular composite (MIC) composed of the aluminum nanoparticles and molybdenum trioxide are studied with differential scanning calorimetry (DSC) as a function of the size and size distribution of the aluminum particles. Both broad and narrow size distributions have been investigated with aluminum particle sizes ranging from 30 to 160 nm; comparisons are also made to the behavior of micrometer-size particles. Several parameters have been used to characterize the reactivity of aluminum nanoparticles, including the fraction of aluminum that reacts prior to aluminum melting, heat of reaction, onset and peak temperatures, and maximum reaction rates. The results indicate that the reactivity of aluminum nanoparticles is significantly higher than that of the micrometer-size samples, but depending on the measure of reactivity, it may also depend strongly on the size distribution. The isoconversional method was used to calculate the apparent activation energy, and the values obtained for both the Al/O2 and Al/MoO3 reaction are in the range of 200–300 kJ/mol.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 444, Issue 2, 15 May 2006, Pages 117–127
نویسندگان
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