Al-based Energetic Nano Materials: Design, Manufacturing, by Carole Rossi

By Carole Rossi

Over the earlier 20 years, the fast improvement of nanochemistry and nanotechnology has allowed the synthesis of varied fabrics and oxides within the type of nanopowders making it attainable to supply new lively compositions and nanomaterials.

This publication has a bottom-up constitution, from nanomaterials synthesis to the appliance fields. ranging from aluminum nanoparticles synthesis for gas software, it proposes a close state-of-the artwork of the various tools of education of aluminum-based reactive nanomaterials. It describes the innovations constructed for his or her characterization and, while to be had, an outline of the basic mechanisms liable for their ignition and combustion. This ebook additionally provides the chances and obstacles of other lively nanomaterials and similar constructions in addition to the research in their chemical and thermal homes. the entire is rounded off with a glance on the performances of reactive fabrics when it comes to warmth of response and reactivity commonly characterised because the self-sustained combustion pace. The publication finally ends up with an outline of present reactive nanomaterials purposes underlying the promising integration of aluminum-based reactive nanomaterial into micro electromechanical systems.

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The sonication lasts for a total duration of a few minutes. For example, 1 s delay is used after every 2 s of sonication to avoid overheating of the solution that could lead to undesired ignition of powder. For liquids that can oxidize aluminum, such as isopropanol, the exposure time to the solvent is reduced. The assessment of the quality of mechanical mixing of nanopowders, related to the sample preparation method, is of crucial importance while being difficult to be evaluated quantitatively.

Typical DSC curve of the aluminum oxidation in O2/Ar oxidizing environment The complex oxidation process leading to the formation of the alumina passivation layer is still not well understood but few chemical reactions and phenomenological mechanisms responsible for oxidation have been proposed in the literature to fit the experimental results. They will be presented in the following sections. 1. Initial stage of aluminum oxidation from first principles calculations The early stage of aluminum oxidation (n = 0) has attracted much interest because of its practical importance and also because it was considered as a model system to understand the fundaments of the oxidation of metallic surfaces.

The resulting γ-A12O3 is stabilized due to its small crystallite size. This amorphous to γ-Al2O3 phase transformation can lead to a small mass increase because the density of the oxide layer increases. The growth of a continuous γ-Al2O3 layer and its partial transformation into θ-Al2O3 22 Al-Based Energetic Nanomaterials polymorph takes place in a third stage after the melting point of Al (660°C). Finally, the fourth stage corresponds to the high temperature oxidation above 1,100°C and leads to the formation of α-Al2O3.

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