Preparation and Energetic Properties of Nanothermites Based on Core–Shell Structure

Ma, Xiaoxia; Zhang, Kaili

doi:10.1007/978-981-15-4831-4_3

Cited by 2 publications

(3 citation statements)

References 66 publications

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“…This phenomenon can be elucidated by the presence of residual fire paths, even within tightly compacted compositions, which albeit exhibiting diminutive diameters and limited propagation distances, nonetheless facilitate the convective feedback of thermal energy. As the charging pressure undergoes an increase, these residual fire paths experience a constriction in their dimensions and a curtailment in their propagation lengths, thereby engendering a diminution in their efficacy as conduits for energy feedback, consequently precipitating a decrease in the burning rate [159][160][161][162][163][164].…”

Section: Degree Of Consolidationmentioning

confidence: 99%

“…This phenomenon can be elucidated by the fact that for such thermites, an increase in the degree of compaction facilitates an enhancement in the thermal conductivity, thereby enhancing the efficiency of energy feedback mechanisms, consequently increasing the burning rate. However, the flame propagation velocity exhibits an escalatory trend with an increase in the loading density and a concomitant diminution in the particle size [159][160][161][162][163][164]. Indeed, both charging pressure and filling density influence the reaction mechanism and heat transfer modes.…”

Section: Degree Of Consolidationmentioning

confidence: 99%

“…Attaining an optimal degree of consolidation poses challenges emanating from theoretical comprehension limitations and the non-uniform distribution of fuel and oxidizer constituents. The synthesis of core-shell structured nano-thermites has been postulated as a potential strategy to engender enhancements in energy density and combustion efficiency [159][160][161][162][163][164].…”

Section: Degree Of Consolidationmentioning

confidence: 99%

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Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Ghedjatti,

Yuan,

Wang

2024

Energies

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The development of nano-energetic materials has significantly advanced, leading to enhanced properties and novel applications in areas such as aerospace, defense, energy storage, and automobile. This research aims to engineer multi-dimensional nano-energetic material systems with precise control over energy release rates, spatial distribution, and temporal and pressure history. In this context, sol–gel processing has been explored for the manufacture of nanocomposite aluminum thermites using aerogels. The goal is to produce nano-thermites (Al/Fe2O3) with fast energy release rates that are insensitive to unintended initiation while demonstrating the potential of sol–gel-derived aerogels in terms of versatility, tailored properties, and compatibility. The findings provide insightful conclusions on the influence of factors such as secondary oxidizers (KClO3) and dispersants (n-hexane and acetone) on the reaction kinetics and the sensitivity, playing crucial roles in determining reactivity and combustion performance. In tandem, ignition systems contribute significantly in terms of a high degree of reliability and speed. However, the advantages of using nano-thermites combined with hot bridge-wire systems in terms of ignition and combustion efficiency for potential, practical applications are not well-documented in the literature. Thus, this research also highlights the practicality along with safety and simplicity of use, making nano-Al/Fe2O3-KClO3 in combination with hot bridge-wire ignition a suitable choice for experimental purposes and beyond.

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Section: Degree Of Consolidationmentioning

confidence: 99%

Section: Degree Of Consolidationmentioning

confidence: 99%

Section: Degree Of Consolidationmentioning

confidence: 99%

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Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Ghedjatti,

Yuan,

Wang

2024

Energies

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Characteristics of Gasless Combustion of Core–Shell Al@NiO Microparticles with Boosted Exothermic Performance

Maini,

Wang,

Wen

2024

ACS Omega

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The microstructures and thermochemical behavior of the energetic composites composed of core–shell structured μAl@NiO microparticles were characterized. These core–shell microparticles were synthesized using a wet-chemistry-based one-pot process, where the assembly was proposed to be driven by the electrostatic force between negatively charged Al and positively charged Ni–NH3 ions. Electron microscopic images demonstrated the formation of NiO nanoparticles adhering to the surface of microsized Al particles with different equivalence ratios. Thermal analysis revealed two consecutive exothermic peaks resulting from the initial thermite reaction between 890 and 960 °C and subsequently the intermetallic/alloy formation reactions between 1000 and 1040 °C. The latter was further confirmed by the endothermic peaks of Al–Ni alloy melting at higher temperatures. The formation of alloy was substantiated by the melting of AlNi3, AlNi, and Al3Ni. The onset temperature of the first exothermic peak decreased with increasing nominal equivalence ratio of the core–shell. Compared to the physically mixed (PM) composite, the core–shell structures decreased the activation energy of the thermite reaction by a mere 9.24 kJ/mol; however, it increased the combustibility by the manifold. The PM composite was not able to be ignited at all by a 5 W laser, while the core–shell counterpart ignited at 2.55 ms and was completely combusted within 6.50 ms accompanying a violent impulse.

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Preparation and Energetic Properties of Nanothermites Based on Core–Shell Structure

Cited by 2 publications

References 66 publications

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Characteristics of Gasless Combustion of Core–Shell Al@NiO Microparticles with Boosted Exothermic Performance

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