Understanding the mechanism of aluminium nanoparticle oxidation

Rai, A.; Park, K.; Zhou, Lei; Zachariah, Michael R.

doi:10.1080/13647830600800686

Cited by 321 publications

(216 citation statements)

References 31 publications

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“…The established inversely proportional correlation between nanoparticle size and reactivity is predominantly surface area driven. Since particle size and mean free path are comparable, the continuum burning model is not valid and oxidation is likely more of a surface process involving the collision of oxygen with the particles and then the subsequent transport through the oxide shell [19]. The above agree to the increased reactivity of Fe85 compared to Fe50, as evidenced in the shock tube results.…”

Section: Tga Studysupporting

confidence: 77%

“…Moreover, the peak thermodynamic gas temperature was calculated at around 1500-1600 K. Based on the curves of heat release and heat release rate, combustion of iron nanoparticles appeared to develop in two distinct phases, a behavior that has been reported in previous published work [3]. A rapid heat release was observed immediately after ignition, suggesting a fast oxidation process of the iron nanoparticles [19]. The ROHR peaked around 1ms after ignition, prior to decreasing back to values close to zero.…”

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confidence: 74%

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Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

et al. 2016

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The present work includes findings from in-principle feasibility studies on iron nanopowder combustion under idealized, engine-like and real engine conditions. The study was conducted under the scope of recent interest of metallic nanoparticles as alternative fuels for Internal Combustion Engines (ICE). More specifically, Fe nanoparticles of different morphology and size were studied with respect to their oxidation characteristics via Thermo-Gravimetric Analysis (TGA), as well as in customized shock-tube, constant volume vessel and CI engine configurations.Combusted powder samples were, in all cases, examined via in-situ and ex-situ techniques for the identification of combustion products and their morphologies.Findings facilitated determination of the main phenomena involved during oxidation.The results verified that combustion of Fe nanoparticles in an engine environment is feasible. Notable differences in the morphological structure of the products formed were identified among the various oxidation/combustion techniques employed.

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Section: Tga Studysupporting

confidence: 77%

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confidence: 74%

Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

et al. 2016

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“…From an experimental point of view, Al and Mg show an interesting plasmonic behavior in the UV [7], and both are quite stable metals in absence of humidity [14] and at moderate temperatures [35]. They suffer a similar tarnishing process that protects the underlying material from further oxidation [36].…”

Section: Influence Of the Oxidation On Plasmonic Performancementioning

confidence: 99%

How an oxide shell affects the ultraviolet plasmonic behavior of Ga, Mg, and Al nanostructures

et al. 2016

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Abstract:The ultraviolet (UV) range presents new challenges for plasmonics, with interesting applications ranging from engineering to biology. In previous research, gallium, aluminum, and magnesium were found to be very promising UV plasmonic metals. However, a native oxide shell surrounds nanostructures of these metals that affects their plasmonic response. Here, through a nanoparticle-oxide core-shell model, we present a detailed electromagnetic analysis of how oxidation alters the UV-plasmonic response of spherical or hemisphere-on-substrate nanostructures made of those metals by analyzing the spectral evolution of two parameters: the absorption efficiency (far-field analysis) and the enhancement of the local intensity averaged over the nanoparticle surface (near-field analysis).

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“…Various explanations for Al oxidation mechanisms have also been proposed, each strongly tied to the ignition mechanism and heating rate [3]- [11]. All theories share a common theme for mass transport of fuel and oxidizer, but differ in how that diffusion is achieved (i.e., via (a) dispersion [3], [4], (b) phase changes in the polymorphous passivation shell [5]- [7] , (c) reactive sintering [8], (d) pressure gradient driven processes [9], [10], and (e) induced electric field influences [11]). This article will not directly deal with any particular reaction mechanism, but rather investigate the influence of a new parameter, mechanical strain, which has only recently been considered in the study of Al oxidation [3], [4], [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Improving aluminum particle reactivity by annealing and quenching treatments: Synchrotron X-ray diffraction analysis of strain

2016

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In bulk material processing, annealing and quenching metals such as aluminum (Al) can relieve residual stress and improve mechanical properties. On a single particle level, affecting mechanical properties may also affect Al particle reactivity. This study examines the effect of annealing and quenching on the strain of Al particles and the corresponding reactivity of aluminum and copper oxide (CuO) composites. Micron-sized Al particles were annealed and quenched according to treatments designed to affect Al mechanical properties. Synchrotron X-ray diffraction (XRD) analysis of the particles reveals the thermal treatment increased the dilatational strain of the aluminum-core, alumina-shell particles. Flame propagation experiments also show thermal treatments effect reactivity when combined with CuO. An effective annealing/quenching treatment for increasing aluminum reactivity was identified. These results show that altering the mechanical properties of Al particles affects their reactivity. This manuscript focuses on synchrotron x-ray diffraction analysis of aluminum particles that have been treated to improve their mechanical properties. The aluminum is then examined for its reactivity with a metal oxide to show the relationship between material processing and the mechanical properties of the metal then extend this understanding towards application for energy generation technologies. We felt this combination of in-depth analysis of the material property of strain based on annealing and quenching processing of a metal powder and its application to reactivity were the perfect combination of mechanical and functional behavior appropriate for Acta Materialia. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 AbstractIn bulk material processing, annealing and quenching metals such as aluminum (Al) can relieve residual stress and improve mechanical properties. On a single particle level, affecting mechanical properties may also affect Al particle reactivity. This study examines the effect of annealing and quenching on the strain of Al particles and the corresponding reactivity of aluminum and copper oxide (CuO) composites. Micron-sized Al particles were annealed and quenched according to treatments designed to affect Al mechanical properties. Synchrotron Xray diffraction (XRD) analysis of the particles reveals the thermal treatment increased the dilatational strain of the aluminum-core, alumina-shell particles. Flame propagation experiments also show thermal treatments effect reactivity when combined with CuO. An effective annealing/quenching treatment for increasing aluminum reactivity was identified. These resultsshow that altering the mechanical properties of Al particles affects their reactivity.

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Understanding the mechanism of aluminium nanoparticle oxidation

Cited by 321 publications

References 31 publications

Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

How an oxide shell affects the ultraviolet plasmonic behavior of Ga, Mg, and Al nanostructures

Improving aluminum particle reactivity by annealing and quenching treatments: Synchrotron X-ray diffraction analysis of strain

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