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Title: Influence of passivation on ageing of nano-aluminum: Heat flux calorimetry and microstructural studies
Authors: Pisharath, Sreekumar
Zhang, Fan
Ang, How Ghee
Keywords: Aluminum Nanoparticles
Issue Date: 2016
Source: Pisharath, S., Zhang, F., & Ang, H. G. (2016). Influence of passivation on ageing of nano-aluminum: Heat flux calorimetry and microstructural studies. Thermochimica Acta, 635, 59-69.
Series/Report no.: Thermochimica Acta
Abstract: Aluminum nanoparticles (n-Al) have been considered as promising fuel for incorporation in propellants and explosives to improve their performance. To prevent oxidation during storage, we investigate the effect of organic coatings on reducing oxidation of n-Al via accelerated ageing tests. The n-Al was modified with 3 different functional organic silanes. The presence of organic coatings on surface-modified n-Al was confirmed by X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). In the accelerated ageing tests, the pristine and surface-modified n-Al were kept at elevated humidity and temperatures. The ageing process was monitored via heat flow calorimeter. The effectiveness of the organosilane coatings as barrier to hydrolysis and oxidation of n-Al was evaluated from the heat released during ageing, as well as the analysis of active Al content of the aged samples. It is found that although the pristine n-Al possesses a natural Al2O3 passivation layer, it cannot prevent n-Al from fully getting oxidized under the conditions tested. Organosilane coatings act as excellent barrier against diffusion of moisture preventing n-Al inside from oxidation. This study shows that all 3 kinds of organosilane-modified n-Al have much better resistance to ageing than the pristine n-Al, therefore demonstrates surface-modification of n-Al is a promising technique to extend the shelf life of n-Al during storage.
ISSN: 0040-6031
DOI: 10.1016/j.tca.2016.04.022
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2016 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Thermochimica Acta, Elsevier B.V.. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EnRI Journal Articles

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