Exothermic characteristics of aluminum based nanomaterials

Abstract

Nano-structured energetic materials have been recently proposed as novel energy storage media where the exothermic reaction is the key to control the heat release process. The properties of nanoalloys, which can be engineered not only by the particle size, but also by varying their elemental compositions, are very appealing. This work conducts a comparative experimental study of the exothermic characteristics of two nanomaterials in the air, aluminum nanoparticles (nAl) and aluminum-copper nanoalloys (nano-AlCu) based on TGA/DSC studies. The results show that the general exothermic characteristics of nano-AlCu are very similar to that of nAl but the nano alloy is more reactive. The nano-AlCu oxides and ignites at lower temperature, and influenced by the heating rate. An early ignition is found for both nanomaterials, and melting of the nano-alloy is believed to be responsible for its early ignition.

Exothermic or Endothermic Decomposition of Disubstituted Tetrazoles Tuned by Substitution Fashion and Substituents

“…Energy release under control is the central task in the area of energetic materials. − Nitrogen-rich materials are widely used in the fields of rockets, missiles, artillery, and gas-generating agents, which require the materials to have low sensitivity and produce hot gases and glowing particles in a short time. Tetrazoles are a family of nitrogen-rich heterocycles and have attracted considerable attention in many areas including pharmaceuticals, energetic materials, , porous materials, fuel cells, and so on.…”

Review of the Problems of Additive Manufacturing of Nanostructured High-Energy Materials

“…Increased reactivity of aluminum nanopowder is known to be one of the key characteristics that contribute to its extensive research and application in the composition of energy systems [ 84 , 85 , 86 , 87 , 88 ]. However, there are drawbacks limiting their application in additive manufacturing.…”

Effect of Heating Rate on Ignition Characteristics of Newly Prepared and Aged Aluminum Nanoparticles

“…Puri et al [28] obtained similar results for the melting mechanism of nano aluminum. Noor et al [29] and Vorozhtsov et al [30] presented the staged oxidation process at low heating rates below 30 K/min. Sundaram et al [31] summarized the oxidation process of Al nanoparticles during combustion, including three stages: particle heating to core melting point, phase transformations and ignition, and surface combustion.…”

“…This critical point is certainly related to the heating rate and the properties of Al nanoparticles. Noor et al [29] showed that the heating rate affected a kinetic oxidation process, and the higher heating rate led to less time for the reaction to fully complete. Levitas et al [20] pointed out that the effect of heating rate on the oxidation process of Al nanoparticles was mainly reflected in the strain rate of the alumina shell.…”

“…The phenomena have been testified by Puri et al [28] through thermogravimetric analysis. Noor et al [29] showed that the higher the heating rate, the higher the ignition temperature of Al nanoparticles. However, the ignition occurred before the melting of Al nanoparticles, which is different from the results in this study.…”