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 13 of 13 for “"Separation Column"”.
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Density Modulated Semi-Packed Micro Gas Chromatography Columns
… requirements of previously reported semi-packed columns causes a significant sacrifice in separation efficiency. This thesis covers the techniques for evaluating the separation column in a gas chromatography system as well as the important parameters that have the most effect on a column’s …
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Toward a microfluidic system for proteomics
… a second set of experiments a short monolithic separation column was fabricated and placed after the immobilized trypsin capillary. This system demonstrated partial separation of the tryptic peptides generated, and detection limits in the pmol range were obtained by utilization of this …
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Chip-Scale Gas Chromatography
… of GC instrument (pre-concentrator/injector, separation column, valves, pumps, and the detector). The purpose of this dissertation is to address the critical need of developing a micro GC system for various field- applications. The uniqueness of this work is to emphasize on the importance of …
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Removal of metal ions from solution by foam fractionation methods
Foam separation is used as a method for separation of solute from liquid solutions. The physical chemistry of a foam-liquid system was investigated including studies of foam density, foam stability and foam drainage, and the counter-current flow of liquid and foam. The experimental results obtained …
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Zebra GC: A Fully Integrated Micro Gas Chromatography System
… preconcentrator (microPC), a MEMS separation column with on-chip thermal conductivity detector (microSC-TCD), the flow controller unit, and all the necessary flow and thermal management as well as user interface circuitry are integrated to realize the fully functional microGC …
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Microfluidic Columns with Nanotechnology-Enabled Stationary Phases for Gas Chromatography
… of key GC components (preconcentrator, separation column, detector, and pumps) using micro- and nanotechnology based techniques is an on-going research field. This dissertation specifically deals with the design, fabrication, coating, and chromatographic testing of microfabricated …
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Modular GC: A Fully Integrated Micro Gas Chromatography System
… heater for headspace injection, microfabricated separation column (µSC), a Photoionization Detector (PI-D), and a flow controller unit are integrated with the modular hardware and software to realize a fully functional Vacuum Outlet µGC system. We have designed a novel auto-calibration method for …
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MicroGC: Of Detectors and their Integration
… the ability to improve on conventional gas separation and identification techniques. Specifically, we have provided a new spin to the age-old thermal conductivity detector enabling its monolithic integration with a separation column. A reference-less, two-port integration architecture and a …
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Chemical Micro Preconcentrators Development for Micro Gas Chromatography Systems
… concentrates them, and injects them into the separation column for analysis. This work resulted in the development of silicon-glass bonded chips consisting of 7 mm x 7 mm x 0.38 mm multiport cavity with thousands of embedded 3D microstructures (to achieve high surface-to-volume ratio) coated …
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The formation, modification and characterisation of monolithic ion exchangers for separation science
… silica and polymer-based monolithic phases for separation science are presented. The application of capacitively contactless conductivity detection (C4D) to capillary ion chromatography and the characterisation of the above modified capillary stationary phases have been investigated. The …
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Novel absorption detection techniques for capillary electrophoresis
… (CE) has emerged as one of the most versatile separation methods. However, efficient separation is not sufficient unless coupled to adequate detection. The narrow inner diameter (I. D.) of the capillary column raises a big challenge to detection methods. For UV-vis absorption detection, the …
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A Fast-Response Odor Chromatographic Sniffer (FOX)
… stationary phase coatings for microfabricated columns, achieving up to 8300 theoretical plates per meter for naphthalene using 1-butylpyridinum bis(trifluoromethylsulfonyl)imide [BPY][NTf2] at 240°C. The development of portable systems for fuel adulteration detection is demonstrated, capable of …
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Design, integration schemes, and optimization of conventional and pressurized oxy-coal power generation processes
… is performed while utilizing a direct contact separation column (DCSC) instead of a surface heat exchanger for more reliable and durable thermal recovery. Despite the lower effectiveness compared to a surface heat exchanger, optimization employing newly developed optimal operating criteria that …