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Highly reactive energetic films by pre-stressing nano-aluminum particles

Energetic films were synthesized using stress altered nano-aluminum particles (nAl). The nAl powder was pre-stressed to examine how modified mechanical properties of the fuel particles influenced film reactivity. Pre-stressing conditions varied by quenching rate. Slow and rapid quenching rates induc...

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Autores principales: Bello, Michael N., Williams, Alan M., Levitas, Valery I., Tamura, Nobumichi, Unruh, Daniel K., Warzywoda, Juliusz, Pantoya, Michelle L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9076265/
https://www.ncbi.nlm.nih.gov/pubmed/35542678
http://dx.doi.org/10.1039/c9ra04871e
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author Bello, Michael N.
Williams, Alan M.
Levitas, Valery I.
Tamura, Nobumichi
Unruh, Daniel K.
Warzywoda, Juliusz
Pantoya, Michelle L.
author_facet Bello, Michael N.
Williams, Alan M.
Levitas, Valery I.
Tamura, Nobumichi
Unruh, Daniel K.
Warzywoda, Juliusz
Pantoya, Michelle L.
author_sort Bello, Michael N.
collection PubMed
description Energetic films were synthesized using stress altered nano-aluminum particles (nAl). The nAl powder was pre-stressed to examine how modified mechanical properties of the fuel particles influenced film reactivity. Pre-stressing conditions varied by quenching rate. Slow and rapid quenching rates induced elevated dilatational strain within the nAl particles that was measured using synchrotron X-ray diffraction (XRD). An analytical model for stress and strain in a nAl core–Al(2)O(3) shell particle that includes creep in the shell and delamination at the core–shell boundary, was developed and used for interpretation of strain measurements. Results show rapid quenching induced 81% delamination at the particle core–shell interface also observed with Transmission Electron Microscopy (TEM). Slower quenching elevated dilatational strain without delamination. All films were prepared at approximately a 75 : 25 Al : poly(vinylidene fluoride) PVDF weight ratio and were 1 mm thick. A drop weight impact test was performed to assess ignition sensitivity and combustion. Stress altered nAl exhibited greater energy release rates and more complete combustion than untreated nAl, but reaction dynamics and kinetics proceeded in two different ways depending on the nAl quenching rate during pre-stressing.
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spelling pubmed-90762652022-05-09 Highly reactive energetic films by pre-stressing nano-aluminum particles Bello, Michael N. Williams, Alan M. Levitas, Valery I. Tamura, Nobumichi Unruh, Daniel K. Warzywoda, Juliusz Pantoya, Michelle L. RSC Adv Chemistry Energetic films were synthesized using stress altered nano-aluminum particles (nAl). The nAl powder was pre-stressed to examine how modified mechanical properties of the fuel particles influenced film reactivity. Pre-stressing conditions varied by quenching rate. Slow and rapid quenching rates induced elevated dilatational strain within the nAl particles that was measured using synchrotron X-ray diffraction (XRD). An analytical model for stress and strain in a nAl core–Al(2)O(3) shell particle that includes creep in the shell and delamination at the core–shell boundary, was developed and used for interpretation of strain measurements. Results show rapid quenching induced 81% delamination at the particle core–shell interface also observed with Transmission Electron Microscopy (TEM). Slower quenching elevated dilatational strain without delamination. All films were prepared at approximately a 75 : 25 Al : poly(vinylidene fluoride) PVDF weight ratio and were 1 mm thick. A drop weight impact test was performed to assess ignition sensitivity and combustion. Stress altered nAl exhibited greater energy release rates and more complete combustion than untreated nAl, but reaction dynamics and kinetics proceeded in two different ways depending on the nAl quenching rate during pre-stressing. The Royal Society of Chemistry 2019-12-09 /pmc/articles/PMC9076265/ /pubmed/35542678 http://dx.doi.org/10.1039/c9ra04871e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Bello, Michael N.
Williams, Alan M.
Levitas, Valery I.
Tamura, Nobumichi
Unruh, Daniel K.
Warzywoda, Juliusz
Pantoya, Michelle L.
Highly reactive energetic films by pre-stressing nano-aluminum particles
title Highly reactive energetic films by pre-stressing nano-aluminum particles
title_full Highly reactive energetic films by pre-stressing nano-aluminum particles
title_fullStr Highly reactive energetic films by pre-stressing nano-aluminum particles
title_full_unstemmed Highly reactive energetic films by pre-stressing nano-aluminum particles
title_short Highly reactive energetic films by pre-stressing nano-aluminum particles
title_sort highly reactive energetic films by pre-stressing nano-aluminum particles
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9076265/
https://www.ncbi.nlm.nih.gov/pubmed/35542678
http://dx.doi.org/10.1039/c9ra04871e
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