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.
Results
Showing 1 to 20 of 20 for “"mesostructure"”.
-
Manipulating lipid mesostructure using hard and soft material additives
Lipids are biological amphiphilic molecules that at their most basic level form a simple but important structural framework for cells. Lipids have recently increasingly been viewed as complex and active components of biological systems, but the majority of research continues to focus on biological …
-
A Process for Manufacturing Metal-Ceramic Cellular Materials with Designed Mesostructure
The goal of this work is to develop and characterize a manufacturing process that is able to create metal matrix composites with complex cellular geometries. The novel manufacturing method uses two distinct additive manufacturing processes: i) fabrication of patternless molds for cellular metal …
-
Improving selectivity in electrochemical CO₂-to-fuels catalysis : the role of catalyst mesostructure, surface structure, and electrolyte
… enables the discovery that electrode mesostructure can have significant impacts on CO₂ reduction selectivity. As the electrode structure becomes rougher, diffusion gradients of the HCO₃⁻ proton donor formed at the double layer suppresses H₂ evolution activity. On both Au and Ag …
-
Supramolecular templating of mesoporous zirconia-based nanocomposite catalysts
… and condensed to form an organic-inorganic mesostructure. The phosphate head group reacted with the zirconium alkoxide to form a covalent linkage, which was found necessary for formation of the mesostructure. The phosphate head group allowed the surfactant to be removed without mesostructure …
-
A continuum constitutive model for the mechanical behavior of woven fabrics including slip and failure
… Because it is physically based on the fabric mesostructure, the model can be used to predict the behavior of novel fabric designs. It can be easily tailored to a wide variety of different applications through the choice of suitable, physically motivated constitutive behaviors for the …
-
Synthesis and Characterization of Functional Mesostructures Using Colloidal Crystal Templating
Functional 3-D periodic mesostructures were synthesized via colloidal crystal templating, and their chemical, physical, and optical properties were characterized. By forming colloidal crystals through self-organization, infiltrating the interstitial space with functional materials, and removing the …
-
Mechanical Characterization of Selectively Laser Melted 316L Stainless Steel Body Centered Cubic Unit Cells and Lattice of Varying Node Radii and Strut Angle
… properties and failure mechanisms of the mesostructure. Quasi static compression tests were performed on an Instron® universal testing machine with a 50kN load cell at 0.2mm/min. The test samples were built using a SLM Solutions 125 selective laser melting machine with 316L stainless …
-
Characterization of mechanical properties of fused deposition modeling manufactured polycarbonate composites
… formulation developed in Matlab. Image mesostructure analysis is carried out to measure fiber geometric properties which are incorporated in the first part of the code. This generates random fiber geometry to simulate the geometric characteristics of actual FDM samples. It also aids in …
-
Synthesis and characterisation of proton conducting composite materials resilient to dehydration at elevated temperatures
… interaction between the NSF and the oxide mesostructure. Next a series of mX2O5-NSF composites were synthesised with C6, C12, and C18 templates. Here the most promising sample displayed a conductivity of 21.96 mS cm-1 at 100 °C, surpassing the literature value for a Nafion 117 film (ca. 8 …
-
Composition and Manufacturing Effects on Electrical Properties of Li/FeS2 Thermal Battery Cathodes
… ionic conductivity of the cell as the cathode mesostructure is reordered in response to the external compressive stress. The combined effect of deformation, component composition, and manufacturing conditions on electrical conductivity has not been studied, yet the cathode electrical properties …
-
Direct liquid crystal templating of mesoporous silica
… mixtures under<br/>hydrothermal conditions. The mesostructure showed very good long-range order and<br/>very narrow pore size distributions, with -3.4 mn diameter pores and -1.4 mn thick<br/>walls.<br/><br/>In addition, mesoporous silicas were prepared using a sol-gel route …
-
Fabrication and osmosis-mediated dynamics of a plant-inspired, fluid-filled, soft actuator
… in concentration, wall mechanical response, or mesostructure of closed-cell, fluid-filled, osmolyte-driven active materials, I fabricate and characterize synthetic plant tissue analogs (PTAs). I create these analogs by encapsulating micron-sized saltwater droplets within thin …
-
Network morphologies in monodisperse and polydisperse multiblock terpolymers.
… reveals that an OSISO sample with a lamellar mesostructure fractures in a brittle fashion at a strain of 0.06. An OSISO containing the O70 network, in contrast, has a strain at failure of 1.3, even though the crystallinity of the terminal blocks is above the brittle threshold established in …
-
The Influence of Time-Dependent Rheology on the Multiple Scales of 3D Printing with Cementitious Materials
… within these experimental procedures. On a mesostructured scale, the cross-sectional morphology of printed filaments is experimentally and numerically studied with material ageing, and how it changes during the conventionally defined printable limit known as Open Time is demonstrated. A …
-
Nonaqueous synthesis of metal oxide nanoparticles and their assembly into mesoporous materials
This thesis mainly consist of two parts, the synthesis of several kinds of technologically interesting crystalline metal oxide nanoparticles via nonaqueous sol-gel process and the formation of mesoporous metal oxides using some of these nanoparticles as building blocks via evaporation induced …
-
Unique templating of and applications enabled through mesoporous colloids
… replication and preserving the fine-scale mesostructure of the colloid. This approach can be generalized for templating materials, which are inherently difficult to template with conventional colloidal crystals. Two major applications were investigated utilizing the mesoporous colloids. The …
-
The palaeoredox condition and morphological variation of microbialites from the Nama Group, South Africa
… to study local redox conditions. Analysis of the mesostructure and microstructure of the microbialites indicates that they were columnar stromatolites that grew into an extensive reef of domal stromatolites within the subtidal zone. Small-scale spatiotemporal feature variations indicate there was …
-
Multiscale Modeling of the Mechanical Behavior of Clay
… p ressure. We s tudy t he e volution o f mesostructures by analyzing the geometric parameters (including the stack size distribution, fabric tensors, interstack pair correlation, etc.) in order to establish the relation between mesoscale and macroscopic behaviors. The potential energy is …
-
Elasticity measurements at extreme conditions: application to FeO and FeNi-alloy
… compounds, and materials with complex mesostructure have some internal degree of freedom, and could therefore experience internal relaxation and show deviations from normal elastic behaviour. A methodology to measure inelastic x-ray scattering in externally heated diamond anvil cells …
-
SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… mesoporous carbons (MC-WO3) retained the ordered mesostructure, high BET specific surface area and large pore volume. The MC-WO3 supported Pt catalysts (Pt/ MC-WO3) were prepared by wet impregnation. According to the results of electrochemical tests of CV and LSV, the catalytic activity of the …