Nanosized components of energetic systems: Structure, thermal behavior, and combustion

Пивкина, Алла Н.; Frolov, Yu. V.; Иванов, Д. А.

doi:10.1007/s10573-007-0008-3

Cited by 35 publications

(18 citation statements)

References 5 publications

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“…Many different mechanisms have been proposed to explain the combustion behavior of Al nanoparticles (Al-NPs). [16][17][18][19] By adding Al-NPs into micron size particles, numerous experiments have observed the enhanced oxidation reactivity in terms of burning rate, 20,21 flame speed, 22,23 activation energy, 24 ignition sensitivity, 23,[25][26][27] combustion velocity, 25 and agglomeration. 3 Nanosize Al particles have lower melting temperatures than that of micron size particles, because of large surface-to-volume ratio.…”

Section: Introductionmentioning

confidence: 99%

Size effect on the oxidation of aluminum nanoparticle: Multimillion-atom reactive molecular dynamics simulations

Liu

Kalia

Nakano

et al. 2013

Journal of Applied Physics

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Articles you may be interested inCooling rate and size effects on the medium-range structure of multicomponent oxide glasses simulated by molecular dynamics Size effects in the infrared spectra of N H 3 ice nanoparticles studied by a combined molecular dynamics and vibrational exciton approachThe size effect in the oxidation of aluminum nanoparticles (Al-NPs) has been observed experimentally; however, the mechano-chemistry and the atomistic mechanism of the oxidation dynamics remain elusive. We have performed multimillion atom reactive molecular dynamics simulations to investigate the oxidation dynamics of Al-NPs (diameters, D ¼ 26, 36, and 46 nm) with the same shell thickness (3 nm). Analysis of alumina shell structure reveals that the shell of Al-NPs does not break or shatter, but only deforms during the oxidation process. The deformation depends slightly on the size of Al-NP. This reaction from the oxidation heats the Al-NP to a temperature of T > 5000 K. Ejection of Al atoms from shell starts earlier in small Al-NPs-at t 0 ¼ 0.18, 0.28 and 0.42 ns for D ¼ 26, 36 and 46 nm, when they all have the same shell temperature of 2900 K. As the oxidation dynamics proceeds, the total system temperature (including the environmental oxygen) increases monotonically; however, the time derivative of the total temperature, (dT system /dt), reaches a maximum at t 1 ¼ 0.20, 0.32 and 0.51 ns for D ¼ 26, 36 and 46 nm. At this peak value of (dT system /dt), the shell temperature for the three Al-NPs are 3100 K, 3300 K, and 3500 K, respectively. The time lag between t 1 and t 0 is 0.02, 0.04 and 0.09 ns for D ¼ 26, 36 and 46 nm clearly indicates the size effect.

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Section: Introductionmentioning

confidence: 99%

Size effect on the oxidation of aluminum nanoparticle: Multimillion-atom reactive molecular dynamics simulations

Liu

Kalia

Nakano

et al. 2013

Journal of Applied Physics

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Section: Energetic Inks For Rms: Composition and Componentsmentioning

confidence: 99%

“…The structure, combustion and application of energetic systems based on fine, submicron and nanosized metals (in addition to changes in the names of these materials with time) were investigated extensively by the author's group [38,[152][153][154][155][156][157], as well as by other teams of researchers [158][159][160][161][162][163][164]. The most prominent result observed was the decrease in the ignition time and increase in the burning rate for compositions containing nano-Al [38,155,156]. However, the wide utilization of nanometals is limited by several factors, i. e., (i) the reduced metal content and associated performance losses [160] (note the surprising positive effect of the oxide layer [165]), (ii) stability issues, e. g., oxidation during storage [166], (iii) coalescence prior to reaction, diminishing the effects of nanosize [167,168], (iv) the gradual increase in viscosity for compositions with a binder [169], and (v) the difficulty of obtaining a uniform composite mixture with nanocomponents [156,170].…”

Section: Energetic Inks For Rms: Composition and Componentsmentioning

confidence: 99%

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

Muravyev

Моногаров

Schaller

et al. 2019

Propellants Explo Pyrotec

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The modern “energetic‐on‐a‐chip” trend envisages reducing size and cost while increasing safety and maintaining the performance of energetic articles. However, the fabrication of reactive structures at micro‐ and nanoscales remains a challenge due to the spatial limitations of traditional tools and technologies. These mature techniques, such as melt casting or slurry curing, represent the formative approach to design as distinct from the emerging additive manufacturing (3D printing). The present review discusses various methods of additive manufacturing based on their governing principles, robustness, sample throughput, feasible compositions and available geometries. For chemical composition, nanothermites are among the most promising systems due to their high ignition fidelity and energetic performance. Applications of reactive microstructures are highlighted, including initiators, thrusters, gun propellants, caseless ammunition, joining and biocidal agents. A better understanding of the combustion and detonation phenomena at the micro‐ and nanoscale along with the advancement of deposition technologies will bring further developments in this field, particularly for the design of micro/nanoelectromechanical systems (MEMS/NEMS) and propellant grains with improved performance.

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“…Recently, many investigators have confirmed that using nanodispersive aluminum powder noticeably improved the operational and physical characteristics of rocket fuels [6][7][8]. Consequently, it can be supposed that the addition of nanodispersive powdered aluminum borides into HEC will also improve the performance of these compositions through the increase in the rate and efficiency of combustion of these components.…”

Section: Introductionmentioning

confidence: 99%

Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

et al. 2015

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This work presents investigations into the composition and some properties of nanodispersive powders of aluminum boride prepared by the plasma-recondensation technique. It is shown that, under a strictly determined aluminum : boron ratio in the starting mixture and with the complete observance of technological processing parameters, aluminum boride (n-AB) nanopowders of the required composition and dispersivity can be obtained. SEM investigations of the aluminum boride samples reveal that aluminum boride powders are mixtures of spherical particles of different sizes and a significant agglomeration of the particles is observed. In general, the sizes of particles are varied from several dozens of nanometers up to 500 nm and more. Investigations into the thermal-oxidative activity of synthesized aluminum boride using thermogravimetric and differential thermal analysis show that these compounds are more active towards air than nanodispersive aluminum. The highest rate of oxidation of aluminum borides was observed in the temperature range of 680-700°C.

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Nanosized components of energetic systems: Structure, thermal behavior, and combustion

Cited by 35 publications

References 5 publications

Size effect on the oxidation of aluminum nanoparticle: Multimillion-atom reactive molecular dynamics simulations

Size effect on the oxidation of aluminum nanoparticle: Multimillion-atom reactive molecular dynamics simulations

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

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