2026-09-22T08:55:49Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/29703 2023-07-10 col_2142_14789 col_2142_5131 com_2142_14788 com_2142_8903 com_2142_5130

Dlott, Dana D. Brewster, M. Quinn Girolami, Gregory S. McDonald, J. Douglas Conner, Rusty 2012-02-06T20:11:56Z 2012-02-06T20:11:56Z 2011-12 2012-02-06T20:11:56Z 2011-12 The combustion of nano-aluminum in Teflon was studied using time-resolved laser spectroscopy. This reactive material has a stored energy of ~21 kJ cm-3, nearly twice the energy content of the best molecular explosives. Experiments investigated the fundamental combustion processes of initiation and ignition. Initiation occurs when the first bonds break in the material. This step usually requires energy, but allows the material to undergo the widespread release of energy, known as ignition. These experiments used pulsed laser absorption to heat Al nanoparticles to ~3000 K in ~100 picoseconds. This activated the materials, allowing reactions to proceed. Initiation was studied by tracking changes in the vibrational band structure of Teflon using transient absorption of a femtosecond mid-IR laser pulse. Ignition was studied by analyzing the UV/visible burst of emission from flash-heated materials with an ultrafast streak camera detector. After flash-heating, hot Al attacked the surrounding Teflon, consuming CFO groups in ~50 ps. A confined Al plasma created by the laser registered the ~100 ps release of energy from the relaxation of nascent AlF, an elementary reaction product observed in the electronic ground-state within ~200 ps. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-11-30T14:33:04Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Conner_Rusty.pdf: 38496682 bytes, checksum: e84133b9c5685305cd0b25b6f3aa081f (MD5) Made available in DSpace on 2012-02-06T20:11:56Z (GMT). No. of bitstreams: 2 Conner_Rusty.pdf: 38496682 bytes, checksum: e84133b9c5685305cd0b25b6f3aa081f (MD5) license.txt: 4061 bytes, checksum: 3d05b5663478386d64aecff448721c1c (MD5) http://hdl.handle.net/2142/29703 en Copyright 2011 Rusty Conner Laser flash-heating aluminum combustion nanoparticles laser ablation fluorination energetic materials reactive materials Initiation and ignition of nano-aluminum in Teflon Dissertation / Thesis text Chemistry 1413 Chemistry 0335 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Chemistry -UIUC 10KS0335PHD