Tuning the reactivity of Al/Fe2O3 nanoenergetic materials via an approach combining soft template self-assembly with sol–gel process process

Zhang, Tianfu; Wang, Zhen; Li, Guoping; Luo, Yunjun

doi:10.1016/j.jssc.2015.06.021

Cited by 35 publications

(10 citation statements)

References 32 publications

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“…It could be attributed to not only the oxidation of the nano-Al layer but also a nonstoichiometric ratio for a complete reaction between Al and CoFe2O4 in the CoFe2O4/Al nanothermite film [27]. Despite all these, the energy release for CoFe2O4/Al NWs investigated in this work is larger than that of reported thermites, such as assembly Fe2O3/Al (2088 J•g −1 ) [38], sol gel Fe2O3/Al (1686 J•g −1 ) [38], physical mixing Fe2O3/Al (1097 J•g −1 ) [38] and porous Co3O4/Al (1740 J•g −1 ) [39]. To acquire the preferable energy release of CoFe 2 O 4 /Al NWs nanothermite films, the different thicknesses of 200, 400 and 600 nm are tested for the Al deposition on a flat surface, respectively.…”

Section: Resultsmentioning

confidence: 64%

A Facile Preparation and Energetic Characteristics of the Core/Shell CoFe2O4/Al Nanowires Thermite Film

Ren²,

et al. 2020

Micromachines

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In this study, CoFe2O4 is selected for the first time to synthesize CoFe2O4/Al nanothermite films via an integration of nano-Al with CoFe2O4 nanowires (NWs), which can be prepared through a facile hydrothermal-annealing route. The resulting nanothermite film demonstrates a homogeneous structure and an intense contact between the Al and CoFe2O4 NWs at the nanoscale. In addition, both thermal analysis and laser ignition test reveal the superb energetic performances of the prepared CoFe2O4/Al NWs nanothermite film. Within different thicknesses of nano-Al for the CoFe2O4/Al NWs nanothermite films investigated here, the maximum heat output has reached as great as 2100 J·g−1 at the optimal thickness of 400 nm for deposited Al. Moreover, the fabrication strategy for CoFe2O4/Al NWs is also easy and suitable for diverse thermite systems based upon other composite metal oxides, such as MnCo2O4 and NiCo2O4. Importantly, this method has the featured advantages of simple operation and compatibility with microsystems, both of which may further facilitate potential applications for functional energetic chips.

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Section: Resultsmentioning

confidence: 64%

A Facile Preparation and Energetic Characteristics of the Core/Shell CoFe2O4/Al Nanowires Thermite Film

Ren²,

et al. 2020

Micromachines

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“…Luo group prepared Al/Fe 2 O 3 EMs via a self-assembly method combined with a sol-gel process method, and the nano-Al particles did not aggregate and were coated by the nano-Fe 2 O 3 particles, providing a high effective contact area between the fuel and oxidizing agent ( Figure 2 a,b). Moreover, the heat release of the assembly-Al/Fe 2 O 3 sample can reach ~2.0 kJ/g [ 46 ]. The advanced isoconversional kinetic analysis of Fe 2 O 3 -2Al thermite reaction was studied by M.J.S.…”

Section: Classification Of Highly Reactive Thermite Ems (Tems)mentioning

confidence: 99%

Highly Reactive Thermite Energetic Materials: Preparation, Characterization, and Applications: A Review

et al. 2023

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As a promising kind of functional material, highly reactive thermite energetic materials (tEMs) with outstanding reactive activation can release heat quickly at a high reaction rate after low-energy stimulation, which is widely used in sensors, triggers, mining, propellants, demolition, ordnance or weapons, and space technology. Thus, this review aims to provide a holistic view of the recent progress in the development of multifunctional highly reactive tEMs with controllable micro/nano-structures for various engineering applications via different fabricated techniques, including the mechanical mixing method, vapor deposition method, assembly method, sol-gel method, electrospinning method, and so on. The systematic classification of novel structured tEMs in terms of nano-structural superiority and exothermic performance are clarified, based on which, suggestions regarding possible future research directions are proposed. Their potential applications within these rapidly expanding areas are further highlighted. Notably, the prospects or challenges of current works, as well as possible innovative research ideas, are discussed in detail, providing further valuable guidelines for future study.

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“…Compared to changing the formulation of thermites, it seems that assembling energetic materials with organized interfacial structures by new preparation methods is more efficient, such as sol–gel, incorporating with MOFs, sputtering, , arrested reactive milling, and so on. Electrospray, one ramification of electrohydrodynamic atomization, is a mature technology widely used in the realm of mass spectrometry, propulsion system of satellites, encapsulation, particle production, surface coating, and film deposition.…”

Section: Introductionmentioning

confidence: 99%

Assembling Hybrid Energetic Materials with Controllable Interfacial Microstructures by Electrospray

Zhang

et al. 2021

ACS Omega

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Constructing hybrid energetic materials (HEMs) consisting of nanothermites and organic high explosives is an efficient strategy to regulate the reactivity of energetic composites. To investigate the role of interfacial microstructures in determining the reactivity of HEMs, we employ electrospray, one ramification of electrohydrodynamic atomization, to assemble Al/CuO and hexanitrohexaazaisowurtzitane (CL-20) into composites with various morphologies from different solvent systems. The morphology and compositional information of the assembled clay-like or granular HEMs, which are obtained from ketone, ester, or mixtures of alcohol and ether, are confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The phase transition of CL-20 due to the fast evaporation of charged droplets and insufficient time for recrystallization is studied by Fourier transform infrared spectroscopy (FTIR). Thermogravimetric-differential scanning calorimetry (TG-DSC) is applied to investigate the thermodynamic behaviors and synergistic effect of the nanothermite and high explosive. Enhancements in combustion performance and pressurization characteristics of the as-sprayed HEMs have been observed through open burn tests and pressure cell tests. Granular HEMs show high gas generation and high pressurization rate, while nitrocellulose (NC) fibers existing in the clay-like HEMs would weaken the reactivity to a certain extent. HEMs obtained from the mixture of n-propanol and diethyl ether, in which nano-CL-20 exists as independent particles rather than a matrix, exhibit high gas generation but low pressurization rate. The results indicate that the energy releasing performance of the prepared HEMs can be readily regulated by constructing various interfacial microstructures to satisfy the broad requirements of energy sources.

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Tuning the reactivity of Al/Fe2O3 nanoenergetic materials via an approach combining soft template self-assembly with sol–gel process process

Cited by 35 publications

References 32 publications

A Facile Preparation and Energetic Characteristics of the Core/Shell CoFe2O4/Al Nanowires Thermite Film

A Facile Preparation and Energetic Characteristics of the Core/Shell CoFe2O4/Al Nanowires Thermite Film

Highly Reactive Thermite Energetic Materials: Preparation, Characterization, and Applications: A Review

Assembling Hybrid Energetic Materials with Controllable Interfacial Microstructures by Electrospray

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