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 95 for “"Flow Cell"”.
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Fourier transform infrared spectrometric detection of chromatographic effluents: instrumental and methodological improvements using a flow cell interface
… untested forms of chromatography using a flow cell interface. These forms of chromatography include High Performance Liquid Chromatography (HPLC), both normal-phase and reversed-phase, and packed-column Supercritical Fluid Chromatography (SFC). Normal phase HPLC-FTIR was demonstrated on …
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Development of a High Precision Quantum Dot Synthesis Method Utilizing a Microfluidic Reactor and In-Line Fluorescence Flow Cell
… for use as spectral converters in solar cells, lighting applications, and biological imaging. These applications require precise control of quantum dot size to maximize performance. The quality, size, and fluorescence of quantum dots depend on parameters that are difficult to control …
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Infrared spectrometry as a high performance liquid chromatographic detector with application to solvent refined coal products
… (FTIR) Spectrometer is presented coupled via a flow cell to size exclusion chromatography. These were used for the analysis of the non-volatile components produced in the liquefaction of coal. Additional work is presented for the coupling of FTIR to analytical scale normal phase chromatography …
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Understanding Formation and Transport of Amorphous Iron Oxyhydroxides in Porous Media using Microfluidic Flow Cells- a Novel Method to Study Freshwater Iron Cycling
… with Fe (II) rich underlying ground water. The flow cell was constructed from Polydimethylsiloxane, (PDMS) a transparent, biologically inert silicone polymer which can be modified to represent the surface properties of natural porous media by oxygen plasma exposure. Our results demonstrated that …
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Electrodeposition of conducting polymer fibers
… Based on a schematic of the electrochemical flow cell used in the electrodeposition process, a physical electrochemical flow cell was constructed. Several trials were carried out in an attempt to repeatedly grow polymer fibers. The fibers grown from successful trials were analyzed and …
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Carbon-based electric double layer capacitors for water desalination
… In addition, we constructed two iterations of flow test channels to perform parametric studies on ion capture. The first flow cell utilized a commercial conductivity probe to measure salt concentration after charging the electrodes without flow. We showed that the ion capture on both the carbon …
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In-situ monitoring of groundwater radionuclides with emphasis on tritium detection
… And finally, by the design and testing of a flow cell detector based on the novel heterogeneous scintillator, including the detection of transient tritium concentration levels. The results have demonstrated that the beta particle in the tritiated water undergoes attenuation which causes a …
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Feasibility of analysis of polar compounds by high performance liquid chromatography with Fourier transform infrared spectroscopic detection
… chromatographic separations employing on-line flow cell Fourier transform infrared spectroscopic detection were developed for polar compounds including phenols, alcohols, amines and azaarenes. Detection by FTIR gave information concerning hydrogen bonding and solvent effects occurring during …
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Development and Characterisation of Solid-State Ion-Selective Electrodes, and their Application to Sweat Analysis for Cystic Fibrosis Diagnosis
… A commercially available sensor array in a flow-cell was initially used in both simulated and live clinical trials, involving the analysis of real sweat samples from confirmed CF and non CF populationsiii. Solid-state ISE’s were then designed, constructed, tested and incorporated into a …
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Immobilization of Ru(bpy)(3)(2+) for Electrogenerated Chemiluminescent Sensors and Application of Interdigitated Array Electrodes in Transmission Ft-Ir Spectroscopy
A flow cell of novel design was used to follow the changes occurring in cation-loaded Nafion films in response to variations of the humidity of a nitrogen purge gas flowing through the cell. The structural changes occurring due to the binding of water to these cation-exchanged membranes was …
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Flow Effects Upon the Repassivation of Iron and Cobalt in Neutral and Acidic Solutions
… were performed in a specially designed flow cell. Particle impaction and subsequent depassivation were simulated through amperometric reduction of the oxide layer. Repassivation of iron, cold rolled steel, and cobalt in neutral and acidic aqueous sulfate solutions was investigated by …
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The Development of a Computational Model of Thrombosis in Hemodialysis Catheters
… modeled TE in a simple, two-dimensional flow cell design by adding quantitative TE code to a commercial computational fluid dynamics (CFD) package, Fluent. This two-dimensional model predicted thrombus initiation and growth and adjusted flow to accommodate thrombus geometries, but was …
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Development of semi-solid alkaline flow battery
Flow battery is an attractive energy storage system due to its ability to decouple power and energy outputs, and its less stringent geometric requirement. However, commercial flow battery technology suffers from low energy density (~z40 Wh/Lcatholyte), high membrane cost (~$ 500/M 2 and species …
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Rapidly Scanning Coulostatic Liquid Chromatography/electrochemistry Combined With Conventional Amperometric Detection in a Series Dual-Electrode Cell
… amperometry in a series dual-electrode cell to create a novel detector for high performance liquid chromatography. After a preliminary period of electrode evaluation, a flow cell was designed and constructed to permit compatible operation of a coulostat and a potentiostat as they …
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Development of an ambient temperature alkaline electrolyser for integrating with the electrical grid and renewable energy system
… is not only to enhance energy efficiency of the cell but to develop low-cost and durable electrodes. During this PhD work the electrodes have been characterised in an 'open-system' and flow-cell alkaline electrolyser. The 'open-system' simulates the monopolar tank-type alkaline electrolyser cell, …
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Development of a detection technique for liquid chromatography and microbore liquid chromatography using tris(2,2'-bipyridyl)ruthenium(II) electrogenerated chemiluminescence
… generated in the electrochemical/optical flow cell used for detection. This technique has proven to be more reproducible and allow better detection limits than pumping externally generated Ru(bpy)$\sb3\sp{3+}$ into the flow cell. Ru(bpy)$\sb3\sp{2+}$ can also be immobilized on an electrode …
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Carbon Dioxide Capture Conversion via Calgary Framework CALF-20: Catalytic Process design and Optimization
… the electrochemical reduction experiments in a flow-cell configuration. The results showed high C2H4 selectivity, conversion efficiency, and catalyst stability at RH 10% and 30%. Chapter 4 included the use of metal-organic frameworks (MOFs) and combining the desirable features of homogeneous and …
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Modeling biotic and abiotic decay of trichloroethylene (TCE) using the Reactive Multi-Species Transport in 3-Dimensional Groundwater Aquifers (RT3D) code
… Aquifers (RT3D) code. RT3D is part of the MODFLOW family of codes that is commonly used in engineering practice. In addition, this thesis explores the mitigation of the effects of back diffusion by implementing these decay processes in a 2-Dimensional flow cell model. The flow cell is built …
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Semi-solid redox flow battery
… and the design and functioning of a redox flow cell. The use of Li-ion battery materials offers significant increases in energy and power density (200 Wh/kg compared to 25-35 Wh/kg for current commercial vanadium redox batteries). The implementation of a redox flow system allows for energy …
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