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Ultrafast spectroscopy of laser-initiated nanoenergetic materials

Published online by Cambridge University Press:  01 February 2011

Yanqiang Yang ,
Zhaoyong Sun ,
Shufeng Wang ,
Selezion A. Hambir ,
Hyunung Yu  and
Dana D. Dlott
Yanqiang Yang
Affiliation:
Department of Physics, Jilin University, Changchun, PRC.
Zhaoyong Sun
Affiliation:
Department of Department of Chemistry, University of California-Davis, Davis, CA 95616.
Shufeng Wang
Affiliation:
School of Chemical Sciences, University of Illinois at Urbana-Champaign Urbana, IL 61801, USA
Selezion A. Hambir
Affiliation:
School of Chemical Sciences, University of Illinois at Urbana-Champaign Urbana, IL 61801, USA
Hyunung Yu
Affiliation:
School of Chemical Sciences, University of Illinois at Urbana-Champaign Urbana, IL 61801, USA
Dana D. Dlott
Affiliation:
School of Chemical Sciences, University of Illinois at Urbana-Champaign Urbana, IL 61801, USA
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Abstract

A picosecond laser flash-heating technique is combined with ultrafast spectroscopic probe diagnostics to investigate the fundamental mechanisms of nanoenergetic material performance. The systems studied include Al nanoparticle aggregates in nitrocellulose (NC) oxidizer, size-selected Al nanoparticles in NC and in Teflon oxidizers, and nanoparticle thermites consisting of 30 nm Al and nanometric MoO3. The time-dependence of reactions between Al and the oxidizer on the picosecond to nanosecond time scales are studied using coherent anti-Stokes Raman scattering (CARS) to monitor oxidizer consumption. The time-dependence of energy release is measured using fast optical spectroscopy. The space-dependence of chemical reaction propagation over 100 to 1500 nm distances is studied using the average distance between nanoparticles as a ruler. The distance of reaction propagation from a flash-heated Al nanoparticle increases linearly with energy, which is explained by a hydrodynamic model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 800: Symposium AA – Synthesis, Characterization, and Properties of Energetic/Reactive Nanomaterials , 2003 , AA5.1
Copyright
Copyright © Materials Research Society 2004

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References

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