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Description:: Directional freeze-casting is a porous materials fabrication technique that is used to create materials with complex, three-dimensional pore structures. Particle suspensions are solidified under a thermal gradient, promoting anisotropic growth of dendrites and incorporation of particles within interdendritic space. A fully-solidified directional freeze-cast structure is composed of dendrites that are...
Keyword:: convection, microstructure, metals, porous, solidification, and freeze-casting
Subject:: Materials Science
Creator:: Scotti, Kristen
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 08/23/2023
Date Created:: 2023-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16652 and etdadmin_upload_1000506

Description:: This thesis demonstrates the use of dual-beam focused ion beam - scanning electron microscopy (FIB-SEM) for making complete three-dimensional reconstructions of SOFC electrodes in order to better understand the links between processing and performance with respect to microstructure. Sufficient compositional contrast, with nano-scale resolution, between Ni and LSM with respect...
Keyword:: FIB-SEM, microstructure, FIB tomography, and solid oxide fuel cell
Subject:: Materials Science and Engineering
Creator:: James Wilson
Owner:: Scholarly Digital Publishing
Date Uploaded:: 10/02/2018
Date Modified:: 10/02/2018
Date Created:: 2008-12-09
Resource Type:: Dissertation

Description:: The macroscale mechanical and physical properties of materials are inherently linked to the underlying microstructure. Traditional continuum mechanics theories have focused on approximating the heterogeneous microstructure as a continuum, which is conducive to a partial differential equation mathematical description. Although this makes large scale simulation of material much more efficient...
Keyword:: microstructure, properties, continuum, failure, and simulation
Subject:: Mechanical Engineering
Creator:: Cahal James McVeigh
Owner:: Scholarly Digital Publishing
Date Uploaded:: 08/16/2018
Date Modified:: 08/16/2018
Date Created:: 2007-09-24
Resource Type:: Dissertation

Description:: Counteranion effects on the rate and stereochemistry of propylene polymerization mediated by ion-pair complexes derived from dimethylzirconocene precatalysts activated with strongly Lewis-acidic perfluoroarylmetalloid cocatalyst/activators are shown to arise from the strength of the cation-anion interaction. This is quantified using CS-symmetric Me2C(Cp)(Flu)ZrMe2 (Cp = C5H4, &#951;5 cyclopentadienyl; Flu = C13H8, &#951;5...
Keyword:: cocatalyst, polyolefin, microstructure, ion pair, metallocene, and polymerization
Subject:: Chemistry
Creator:: John Andrew Stevens Roberts
Owner:: Scholarly Digital Publishing
Date Uploaded:: 05/09/2018
Date Modified:: 05/09/2018
Date Created:: 2006-11-28
Resource Type:: Dissertation

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