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 12 of 12 for “"Pore Collapse"”.
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An Investigation of Pore Collapse in Asymmetric Polysulfone Membranes
… (NMP) in isopropanol to form uniform sized pores. Phase inversion resulted in the formation of an asymmetric membrane. The membranes have a characteristic "skin" which is supported by a highly porous substructure. Water-wet membranes experience capillary force during water evaporation. Since …
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A numerical study of shock-induced hot spot generation in energetic material
… model has been developed based on viscoplastic pore collapse mechanics. Governing equations for the condensed-phase and gas-phase dynamics are derived which contain important processes including viscoplastic heating, finite-rate reaction, mass transfer and heat exchange. The system of equations …
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Collisional and structural properties of water ice in planet-forming regions
… use on board parabolic flights. The porosity and pore collapse of amorphous solid water (ASW) grown at a variety of temperatures was investigated using neutron scattering. The results presented in this thesis show that crystalline water ice particles do not stick at relevant collision velocities, …
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MULTI-SCALE MECHANICS OF COMPOSITE SANDWICH STRUCTURES WITH BIOLOGICALLY INSPIRED FIBER REINFORCED FOAM CORES: A POTENTIAL TEMPLATE FOR DEVELOPING MULTIFUNCTIONAL STRUCTURES
… macrofibers. Shear dominated debonding and pore collapse mechanisms have been identified as the leading modes of failure mechanism. The role of macrofiber volume fraction and strain rate on macroscale response and damage evolution has been evaluated through experiments. It is seen that …
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Mechanical and microstructural characterization of nuclear grade PCEA graphite
… non-linear stress–strain response governed by pore collapse, crack closure, shear banding, and progressive damage accumulation. Microstructural observations using SEM identified the heterogeneous filler–binder–pore network characteristic of PCEA graphite and linked fracture behavior to …
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Synthesis and engineering of metal-organic frameworks for liquid phase applications
… chemical species into the MOF. Even in large pore size MOFs, the pore collapse inducing capillary effects during direct activation from water can be navigated by inclusion of hydrophobic functionalities. The poor stability of powdered ZIF-8 in acidic media and even in neutral conditions is …
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Amorphisation Mechanisms of Metal-Organic Frameworks under High Pressures and Temperatures
… MOFs can, however, make them susceptible to pore collapse and amorphisation under pressure. This limits the practical effectiveness of MOFs in their most commonly synthesised form of crystalline powders, as large-scale production and shaping of powders for industrial use often involves …
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Synthesis and Characterization of Disulfonated Poly(Arylene Ether Sulfone) Random Copolymers as Multipurpose Membranes for Reverse Osmosis and Fuel Cell Applications
… to the casting formulation helped to prevent pore collapse in the porous Udel polysulfone. A minimum of three coats was required to obtain a dense, smooth, and pinhole free skin layer. The generation of three dimensional (ternary) solubility parameter phase diagrams based on experimental data …
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Detonation shock and ignition dynamics in condensed phase explosives
… gas products, and compaction associated with pore collapse and grain rearrangement. We propose a simple empirical dependence of the reaction rate on the initial bed compaction that allows us to calibrate the model for a wide range of initial conditions. For the solid reactants we use a wide …
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Formulation and Implementation of a Constitutive Model for Soft Rock
… is characterized by elastoplasticity, including pore collapse, shear failure, and tensile failure mechanisms; rate-dependence; and pore fluid dependence. The research described in this dissertation was performed with the objectives to formulate a constitutive model which describes all aspects of …
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Rock physics investigations using pressure oscillations
… strain measurements for elastic properties, and pore volumometry for storage capacity. In addition to time, the separate set of measurements require either multiple samples or subjecting the same sample to multiple tests. I modified the oscillating pore pressure method to allow for an experiment …
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Shear-Spun Polymer Nanofibres For Water Purification
… a hierarchical structure with a variety of pore sizes (50-2500 nm) scaling with the different nanofibre diameters. A popular contaminant adsorbent, powdered activated charcoal, was successfully integrated into some nanofibres, as was silver, a material with antibacterial properties, in the …