Superior reactivity of ferroelectric Bi2WO6/aluminum metastable intermolecular composite

Xu, Feiyu; Hirt, Benjamin; Biswas, Prithwish; Kline, Dylan J.; Yang, Yong; Wang, Xizheng; Sehirlioglu, Alp; Zachariah, Michael R.

doi:10.1016/j.ces.2021.116898

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…Among the nanometallic fuels used in energetic materials for propulsion and pyrotechnics, − Aluminum (Al) is the most commonly employed fuel due to its high gravimetric (∼32 kJ/g) and volumetric combustion enthalpy (∼86 kJ/cm 3 ). − Extensive efforts have been employed in modulating the energy release profile of Al nanoparticles in fuel/oxidizer composites by altering the ionic conductivity of oxidizers, − oxidizer morphology, − and utilization of additives − to improve reactivity.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Thermochemical Shock-Induced Stress at the Metal/Oxide Interface Enhances Reactivity of Aluminum Nanoparticles

Biswas

Ghildiyal

et al. 2022

ACS Appl. Mater. Interfaces

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Although aluminum (Al) nanoparticles have been widely explored as fuels in energetic applications, researchers are still exploring approaches for tuning their energy release profile via microstructural alteration. In this study, we show that a nanocomposite (∼70 nm) of a metal ammine complex, such as tetraamine copper nitrate (Cu(NH 3 ) 4 (NO 3 ) 2 /TACN), coated Al nanoparticles containing only 10 wt. % TACN, demonstrates a ∼200 K lower reaction initiation temperature coupled with an order of magnitude enhancement in the reaction rate. Through time/temperature-resolved mass spectrometry and ignition onset measurements at high heating rates, we show that the ignition occurs due to a condensed phase reaction between Al and copper oxide (CuO) crystallized on TACN decomposition. TEM and XRD analyses on the nanoparticles at an intermediate stage show that the rapid heat release from TACN decomposition in-situ enhances the strain on the Al core with induction of nonuniformities in the thickness of its AlO x shell. The thinner region of the nonuniform shell enables rapid mass transfer of Al ions to the crystallized CuO, enabling their condensed phase ignition. Hence, the thermochemical shock from TACN coating induces stresses at the Al/AlO x interface, which effectively switches the usual gas phase O 2 diffusion-limited ignition process of Al nanoparticles to become condensed phase Al ion transfer controlled, thereby enhancing their reactivity.

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Section: Introductionmentioning

confidence: 99%

In-Situ Thermochemical Shock-Induced Stress at the Metal/Oxide Interface Enhances Reactivity of Aluminum Nanoparticles

Biswas

Ghildiyal

et al. 2022

ACS Appl. Mater. Interfaces

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“…One of the difficulties in understanding how powder composites of reactive fuel/oxidizer − systems behave is the lack of control of the mixing length. On the other hand, there is a considerable body of work on the formation of nanolaminate structures with alternating reactive layers typically created by sputter deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Energetic particulate composites have been extensively investigated through macroscopic characterization approaches to characterize temperature, burn rates, and thermal decomposition properties − However, characterization at the microscopic scale has been less readily available. Given that the composition of these composites consists of nano or micro-sized reactants, observation at smaller length scales is needed to better understand the role of mass and heat transfer. ,− Previously, we employed a recently developed microscopic dynamic imaging system to probe the reaction zone of sputter-deposited Al/CuO nanolaminates with μs and μm temporal and spatial resolution respectively, which is more comparable to the reactant dimensions and reaction timescales .…”

Section: Introductionmentioning

confidence: 99%

Direct Imaging and Simulation of the Interface Reaction of Metal/Metal Oxide Nanoparticle Laminates

2022

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One of the difficulties in understanding how powder composites of reactive fuel/oxidizer systems behave is the lack of control of the mixing length. In this study, we have prepared Al/CuO particle laminates using a direct writing approach. With as little as 10 wt % polymers, we were able to obtain free-standing microscale particle-based laminates. Using these composites, we were able to image the cross section of the laminates to directly probe the interface reaction with highspeed microscopic imaging and pyrometry. We show quantitatively how the burn rate can be altered by changing the layer thicknesses of the printed laminates and under high-speed microscopy imaging asymmetry heat transfer resulting in fingering in the temperature profiles in the reaction front. Numerical simulations of the heat and mass transport processes are able to reproduce the finger-structured reaction fronts. We find that for Al/CuO particle-based laminates, the lateral O 2 diffusion rate from the CuO layer to the Al layer appears to be rate-limiting. The finger-like profiles appear due to the combined effects from the faster propagation of the interfacial reaction over the bulk, and the thermal diffusivity differences between the Al/CuO layers. Interestingly we see no evidence of layer intermixing even on postcombustion inspection. These results are to our knowledge the first imaging of interface reactions between particle composites and provide a valuable testbed for probing mechanisms and validating models.

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High dispersity and ultralight PVP-mediated Al/MFe2O4/g-C3N4 (M = Cu, Mg, Ni) nanothermites synthesized by a novel sol-freeze-drying technology

Wang

Guo

Chen

et al. 2023

Advanced Powder Technology

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Superior reactivity of ferroelectric Bi2WO6/aluminum metastable intermolecular composite

Cited by 10 publications

References 43 publications

In-Situ Thermochemical Shock-Induced Stress at the Metal/Oxide Interface Enhances Reactivity of Aluminum Nanoparticles

In-Situ Thermochemical Shock-Induced Stress at the Metal/Oxide Interface Enhances Reactivity of Aluminum Nanoparticles

Direct Imaging and Simulation of the Interface Reaction of Metal/Metal Oxide Nanoparticle Laminates

High dispersity and ultralight PVP-mediated Al/MFe2O4/g-C3N4 (M = Cu, Mg, Ni) nanothermites synthesized by a novel sol-freeze-drying technology

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