Ultrafast spectroscopy of laser-initiated nanoenergetic materials

Yanqiang Yang, Zhaoyong Sun, Shufeng Wang, Selezion A. Hambir, Hyunung Yu, Dana D. Dlott

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)151-160
Number of pages10
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 2003
EventSynthesis, Characterization and Properties of Energetic/Reactive Nanomaterials - Boston, MA., United States
Duration: Dec 1 2003Dec 4 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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