کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
167350 457854 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flash ignition of Al nanoparticles: Mechanism and applications
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Flash ignition of Al nanoparticles: Mechanism and applications
چکیده انگلیسی

Aluminum nanoparticles (Al NPs), due to their high energy density, are important materials for propulsion systems, material synthesis and hydrogen generation. However, the oxidation mechanism of Al NPs at large heating rate remains inconclusive due to the lack of direct experimental evidence. Here, we studied the oxidation mechanism of Al NPs under large heating rate (on the order of 106 K/s or higher) by a simple flash ignition method, which uses a camera flash to ignite Al NPs. The flash ignition occurs when the Al NPs have suitable diameters and sufficient packing density to cause a temperature rise above their ignition temperatures. Importantly, transmission electron microscopy analysis reveals that the Al NPs are oxidized via the melt-dispersion mechanism, providing the first direct experimental evidence thereof. Finally, flash ignition is also applicable to the ignition of flammable gaseous, liquid and solid materials by the addition of Al NPs in lieu of sparks and hotwire igniters.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 158, Issue 12, December 2011, Pages 2544–2548
نویسندگان
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