Production, Characterization, and Combustion of Nanoaluminum in Composite Solid Propellants

Jayaraman, K.; Anand, K.; Bhatt, David; Chakravarthy, Satyanarayanan R.; Sarathi, R.

doi:10.2514/1.36490

Cited by 62 publications

(24 citation statements)

References 45 publications

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“…The maximum size of the agglomerated nano-Al particles is 5 µm, as in the experiments described above. This still retains a large surface area conducive to ease the ignition and short combustion times of nano-aluminium, responsible for high propellant burning rates [2,[9][10][11][12][13][14].…”

Section: Propellant Combustionmentioning

confidence: 99%

“…Combustion photography is adopted for burning rate measurement [13,14]. A window bomb is used for this purpose; it is a pressure vessel with two windows, one to illuminate the sample and the other to view the combustion process with the help of a video camera.…”

Section: Burning Rate Measurementmentioning

confidence: 99%

“…The results revealed that the addition of nano-metal powders slightly reduced the AP decomposition temperature. The use of ultra-fine or nano-aluminium in propellant combustion has been reported recently [2,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Jayaraman

Chakravarthy

Sarathi

2010

Combust Explos Shock Waves

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Nano-aluminium particles are produced using the electric wire explosion process in an inert atmosphere at our institute. This paper reports the characterization of nanoaluminium particles in combination with other solid propellant ingredients for their thermal and combustion behaviour. High-heating-rate hot-stage microscopic experiments are performed with different mixtures of propellant ingredients. The effects of addition of nano-aluminium versus micron-sized aluminium in the middle lamina of sandwiches are analyzed for burning rates and by means of scanning electron microscope and transmission electron microscope micrographs of quench-collected aluminium agglomerates. Nano-aluminized sandwiches with thinner middle lamina show slightly higher burning rates than micron-sized aluminized ones. The quenched surface of nano-aluminized sandwiches shows relatively smaller aluminium agglomerates than with micron-sized aluminium. The resultant particle sizes of nano-aluminium agglomerates is in the range of 1-5 µm, which indicates a higher rate of agglomeration than with micro-aluminium, but these sizes are small relative to the agglomerates of the latter. This is also confirmed by quench-collected agglomerates of nano-aluminium emerging from the burning surface of a composite propellant.

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Section: Propellant Combustionmentioning

confidence: 99%

Section: Burning Rate Measurementmentioning

confidence: 99%

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Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Jayaraman

Chakravarthy

Sarathi

2010

Combust Explos Shock Waves

Self Cite

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“…Nano-aluminium has been gaining attention for use in solid propellant combustion in the last decade [1][2][3][4][5]. The advantages of the use of nano-aluminium are: (1) complete combustion near the burning surface of the propellant, leading to high burning rate of the latter; (2) smaller agglomerate sizes that may result in correspondingly small product oxide droplets, which would incur less two-phase flow loss to thrust in a rocket motor and also low exhaust smoke signature.…”

Section: Introductionmentioning

confidence: 99%

Computer modelling of nano-aluminium agglomeration during the combustion of composite solid propellants

Balbudhe

Roy

Chakravarthy

2015

Proceedings of the Combustion Institute

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“…High energy nanomaterials such as nanothermites [29][30][31][32] and Al nanoparticles [33][34][35][36] have been a topic of increasing research for applications as propellants and explosives [37][38][39][40][41][42]. It is well known that a strong correlation often exists between the energy density of a nanomaterial and its sensitivity; a related issue is that nanoparticles are strongly driven to agglomerate and densify, owing to their relatively high surface free energies [43].…”

Section: Ii12 Synthesis and Functionalization Of Aluminum Nanopartimentioning

confidence: 99%

Nano Engineered Energetic Materials (NEEM)

Dlott¹,

Eden²,

Girolami³

et al. 2011

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. The ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report ABSTRACTThe ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report provides a summary of the accomplishments. In particular, new methods to generate metal nanoclusters were developed that are stabilized against environmental degradation while preserving their high energy content. Rapid expansion supercritical solution processes were developed and applied to synthesize nanosized particulate oxidizers and energetic oxidizer shell/fuel core composites. Surface science and experimental chemistry methods were applied to study the structures and energy releasing reaction pathways of NEEMs. Unique diagnostic capabilities were developed and applied to study the fundamental mechanisms that underlie NEEM dynamic performance. Combustion mechanisms of various NEEMs, including nanothermites and nanoparticulate fuel/liquid oxidizer systems, were experimentally analyzed. The reactive and thermal characteristics of NEEMs were studied using large (billion atoms) multiscale simulations that couple quantum-mechanical calculations to molecular dynamics calculations. In particular, the stability, structure and energetics of metallic nanoparticles with a special focus on the relationships between particle size, shape and excess surface free energy were studied. A unified theory of ignition and combustion of aluminum particles for a wide range of sizes, from nano to meso scales was established. . 12, 777-787 (2010 (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none)18.00 Number of Papers published in peer-reviewed journals:Number of Papers published in non peer-reviewed journals:1. USC group, "Multibillion-atom simulations of nano-mechano-chemistry on petaflops computers," First

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Production, Characterization, and Combustion of Nanoaluminum in Composite Solid Propellants

Cited by 62 publications

References 45 publications

Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Computer modelling of nano-aluminium agglomeration during the combustion of composite solid propellants

Nano Engineered Energetic Materials (NEEM)

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