Ultrafast Shock-Induced Reactions in Pentaerythritol Tetranitrate Thin Films
| Autor: | Jeffrey J. Kay, Alexander S. Tappan, Samuel D. Park, Robert Knepper, Ian Thomas Kohl, Sorin Bastea, Michael R. Armstrong, Joseph M. Zaug |
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| Rok vydání: | 2018 |
| Předmět: |
Shock wave
Exothermic reaction Pentaerythritol tetranitrate 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Chemical reaction Shock (mechanics) chemistry.chemical_compound chemistry Chemical physics 0103 physical sciences Particle Reactivity (chemistry) Physical and Theoretical Chemistry Thin film 010306 general physics 0210 nano-technology |
| Zdroj: | The journal of physical chemistry. A. 122(41) |
| ISSN: | 1520-5215 |
| Popis: | The chemical and physical processes involved in the shock-to-detonation transition of energetic solids are not fully understood due to difficulties in probing the fast dynamics involved in initiation. Here, we employ shock interferometry experiments with sub-20-ps time resolution to study highly textured (110) pentaerythritol tetranitrate (PETN) thin films during the early stages of shock compression using ultrafast laser-driven shock wave methods. We observe evidence of rapid exothermic chemical reactions in the PETN thin films for interface particle velocities above ∼1.05 km/s as indicated by shock velocities and pressures well above the unreacted Hugoniot. The time scale of our experiment suggests that exothermic reactions begin less than 50 ps behind the shock front for these high-density PETN thin films. Thermochemical calculations for partially reacted Hugoniots also support this interpretation. The experimentally observed time scale of reactivity could be used to narrow possible initiation mechanisms. |
| Databáze: | OpenAIRE |
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