Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Shock Compression"”.
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Reactive solids under shock compression
… and energy absorbing molecular materials, under shock compression are explored. To drive shock waves into target materials, an apparatus to launch and monitor laser-driven flyer-plates was developed. This was coupled to a home built photonic Doppler velocimeter (PDV) which tracks the motion of …
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Fast photoemissive probes for shock compression spectroscopy
… varieties were designed and their behavior under shock compression was explored. The first probe was dye-doped silica microspheres, which were found to have 3.5× improved emission intensity under steady-state irradiation than the same dye in solution. When the dye-doped microspheres are embedded …
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Shock compression and dynamic fragmentation of geological materials
This thesis investigated the shock compression and fragmentation of ge- ological materials with application to blast mining. Two geological materi- als were investigated; Lake Quarry Granite and Gosford Sandstone. Lake Quarry Granite was fully dense, while Gosford Sandstone was porous. The …
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Shock compression of water and solutions of ammonium nitrate
… This thesis is primarily concerned with the shock response of water and of aqueous solutions of ammonium nitrate. Of particular interest are the temperatures induced through shock compression. An experimental facility, using a single stage gas gun in the ‘plate impact’ configuration, is …
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New technologies for spectroscopy of materials under static and shock compression
… studying materials under static and shock compression are described. The first known spectra of self-assembled organic monolayers under static pressure up to 10 GPa were obtained by the novel combination of surface-enhanced Raman scattering spectroscopy with diamond anvil cell …
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Tracking hot spot dynamics in solid state explosives with shock compression microscopy
Experimentally investigating the shock initiation of explosives is difficult because of the violence and speed at which explosive processes occur. This dissertation systematically investigates the initiation behavior of solid-state explosives when subjected to shock compression using experimental …
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Optical, electronic, and dynamical phenomena in the shock compression of condensed matter
Despite the study of shock wave compression of condensed matter for over 100 years, scant progress has been made in understanding the microscopic details. This thesis explores microscopic phenomena in shock compression of condensed matter including electronic excitations at the shock front, a new …
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Shock compression and flash-heating of molecular adsorbates on the picosecond time scale
… on metallic substrates during laser-driven shock compression and flash-heating. Adsorbates were in the form of well-ordered self-assembled monolayers (SAMs) and included molecular explosive simulants, such as nitroaromatics, and long chain-length alkanethiols. Based on reflectance …
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From a single grain to microstructure: How explosive grains interact under shock compression
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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CO₂ compression for capture-enabled power systems
… this thesis is to evaluate a new carbon dioxide compression technology - shock compression - applied specifically to capture-enabled power plants. Global warming has increased public interest in carbon capture and sequestration technologies (CCS), but these technologies add significant capital …
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Shock initiation of explosives under the microscope
This dissertation explores the shock compression of solid state explosives by thin, laser-driven flyer plates. These flyer plates consist of aluminum foils, typically 25 – 75 μm thick, which are launched using a Nd:YAG laser with a 20 ns pulse width in a technique developed within the Dlott group. …
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Ultrafast Molecular Dynamics at a Shock -Compressed Metal -Liquid Interface
… is compressed by a ∼5 GPa laser-driven shock wave. Time resolved vibrational sum-frequency (SF) spectroscopy is employed to probe the detailed molecular dynamics of this shock compression and release cycle. SF spectroscopy is only sensitive to the terminal methyl group of an alkanethiol, …
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Shock compressing liquids on a tabletop microscope, with special focus on detonating nitromethane
In this dissertation the shock compression of liquid nitromethane (NM), one of the simplest homogeneous condensed-phase explosives, is explored using a tabletop microscope. The shock is produced using a spatially homogenized laser to launch flyer plates, 0.5 mm diameter, 18 – 37 µm thick disks of …
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Chemical Physics of Hydrazine Under Pressure
… thermodynamic response of hydrazine to extreme compression. The results reveal multiple pressure-induced phase transitions, accompanied by systematic changes in vibrational modes and signatures of increased hydrogen bonding. An isothermal equation of state is determined from diffraction …
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Modeling ignition and extinction in condensed phase combustion
… materials. An experimental “striker confinement” shock compression experiment was developed in the Prof. Glumac’s research group at the University of Illinois to study ignition and reaction in composite reactive materials. These include thermitic and intermetallic reactive powders. We discuss our …
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Three dimensional vibrational spectroscopy and shock initiation of hmx
… of intramolecular energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement …
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Ram-jet combustion based on shock/flame interaction
An experimental investigation into the effects of shock/wake and shock/flame interaction on the base pressure of axisymmetric bodies at Mach 2 has been carried out. This investigation has determined the effects of various forms of shock generator (axisymmetric cowls, twodimensional wedges and …
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Impact modification of Mercury's mantle composition
… models for chemistry of condensation and impact shock compression to address additional problems associated with the process. For ejecta of sufficiently high specific entropy, our simplified chemical models indicate that energy released during condensation of MgO-rich phases buffers the …
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Development of mechano-active organic materials for shock wave energy dissipation
Materials capable of shock wave energy dissipation (SWED) are of interest for protecting personnel and machinery from explosions and ballistic impacts. Although current protective armors often prevent physical injuries by stopping shrapnel or bullets, the shock waves generated by explosions or …
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