Photoignited Aluminum Nanopowder Combustion in Air

摘要

Metal combustion has recently received renewed interest as a result ofrnthe ability to manufacture and characterize nanoparticles. Thesernnanoparticles are known to exhibit desirable traits, mainly their highrnspecific surface area.rnThe objective of this work was to investigate experimentally thernoxidation behavior of nanosized aluminum powders in air under white lightrnphoto-ignition conditions. Powder samples with three different nominal sizernparticles of 20, 50, and 70 nm were characterized with HRSEM and TEM.rnThe results showed that the reactivity of photo-ignited powder decreasedrnwith increasing size whereas the energy threshold for ignition had thernopposite trend. The presence of a natural oxide coating and changes in thernoptical properties of the powder are proposed as the cause of this behavior.