Kinetic Analysis of Thermite Reactions in Al-MoO3 Nanocomposites

Reactions leading to ignition in fully dense nanocomposite Al-oxide systems

“…Detailed studies of exothermic reactions in the ARM-prepared nanocomposite thermites [14][15][16][17] showed that the reaction onset is observed at much lower temperatures, between 400 and 500 K. This significant difference in the onset temperature for the exothermic reaction suggests that the reaction mechanism and respective rate-limiting processes might be different for the ARM-prepared thermites as compared to the nanocomposites thermites containing naturally passivated aluminum particles.…”

“…The manuscript first presents the experimental results, including a very brief overview of the previously published DSC measurements [9][10][11][12][13][14][15][16][17] and new measurements using microcalorimetry. Both data sets are processed to estimate the thickness of the aluminum oxide layer grown based on the measured reaction enthalpy.…”

Metal-based reactive nanomaterials

“…Three of these reactions described individual smaller peaks, similar to those detectable from the DSC trace for mixed nanopowders. Each of these three peaks was described as a first order reaction, with the activation energies of 209, 211, and 373 kJ/mol, respectively [178]. The fourth, broad feature, not detectable for the mixed nanopowder samples, was approximated by a low activation energy (90 kJ/mol) Jander type reaction commonly describing 3-dimensional diffusion.…”

“…DSC curves for stoichiometric 2Al þ MoO 3 prepared by ARM [178] and for a mixture prepared by ultrasonication of nanosized Al and MoO 3 300 400 500 600 700 800 900 1000 1100…”

High‐Energy Al/CuO Nanocomposites Obtained by DNA‐Directed Assembly

“…[4,5,[7][8][9][10][11][12][13][14][15][16] For instance, decreasing the size of the nanoparticles enhances the combustion rate and lowers the ignition temperature. Moreover, the arrangement of the oxidizer and the fuel nanoparticles and their intimacy significantly impact the nanothermite burn rate and determine the propagation rate of the combustion wave front and the release of energy.…”