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Articles 91 - 120 of 229
Full-Text Articles in Chemical Engineering
Novel Iii-V Alloys For Unassisted Water Splitting., Alejandro Martinez-Garcia
Novel Iii-V Alloys For Unassisted Water Splitting., Alejandro Martinez-Garcia
Electronic Theses and Dissertations
Direct conversion of solar energy to fuels by photoelectrochemical (PEC) water splitting has been identified as a promising route for sustainable power generation and storage. However, semiconductor materials with suitable opto-electronic properties have yet to be identified. In this dissertation, band gap engineering of III-V alloys, tuning the light sensitivity of GaP and GaN nitride through alloying Sb, is investigated for developing new semiconductor alloys with appropriate opto-electronic properties and their performance with overall water photoelectrolysis. In addition to III-V materials, copper oxide (Cu2O) electrode was investigated for p-type semiconductor material. The new III-V alloy anodes were studied …
Towards A Cost-Effective Biorefinery : Production Of Activated Carbons From Residual Biomass For Energy Storage Devices., Zachary Dean Herde
Towards A Cost-Effective Biorefinery : Production Of Activated Carbons From Residual Biomass For Energy Storage Devices., Zachary Dean Herde
Electronic Theses and Dissertations
Biomass processing for industrial products and biofuels has gained an increasing presence as society looks to using sustainable resources for manufacturing and renewable fuels for energy. However, these sustainably produced materials and products cannot gain a competitive edge because of the manufacturing expenses that are a result of high process temperatures and pressures. In order to lower these costs, theoretical modeling has described a value-added co-product strategy as one of the best ways to combat high bioprocessing prices. Biomass has been shown to make effective carbons for energy storage devices such as supercapacitors and batteries. These carbons, with the right …
Advanced Carbon Materials Based Electrodes For High Performance Symmetric Supercapacitors, Keliang Wang
Advanced Carbon Materials Based Electrodes For High Performance Symmetric Supercapacitors, Keliang Wang
Electronic Theses and Dissertations
Supercapacitors have received considerable attention due to their high energy density, long life time, rapid charge/discharge rate, and because they are environmental friendly technology. Electrode materials play a key role in the final performance of supercapacitors. Carbon, usually used as symmetric supercapacitors electrode materials, exhibit extraordinary stability in harsh electrolyte and electrochemical performance owing to its physical and chemical properties. In addition, porous structure originated from activation, excellent electrical conductivity, sustainability, wide availability and low cost further offering the improvement in electrochemical performance and make it to be a promising electrode material for symmetric supercapacitors. Considering the factors affected electrochemical …
Activated Carbon Preparation And Modification For Adsorption, Yuhe Cao
Activated Carbon Preparation And Modification For Adsorption, Yuhe Cao
Electronic Theses and Dissertations
Butanol is considered a promising, infrastructure-compatible biofuel. Butanol has a higher energy content than ethanol and can be used in conventional gas engines without modifications. Unfortunately, the fermentation pathway for butanol production is restricted by its toxicity to the microbial strains used in the process. Butanol is toxic to the microbes, and this can slow fermentation rates and reduce butanol yields. Gas stripping technology can efficiently remove butanol from the fermentation broth as it is produced, thereby decreasing its inhibitory effects. Traditional butanol separation heavily depends on the energy intensive distillation method. One of the main issues in acetone-butanol-ethanol fermentation …
Designing And Development Of A Photobioreactor For Optimizing The Growth Of Micro Algae And Studying Its Growth Parameters, Sarmila Katuwal
Designing And Development Of A Photobioreactor For Optimizing The Growth Of Micro Algae And Studying Its Growth Parameters, Sarmila Katuwal
Electronic Theses and Dissertations
This thesis presents the estimated value of materials required to grow 1g of biomass and the analysis of the light intensity with respect to flow path and flow rate. This thesis aims to design the sparger for a flat plate Photobioreactor, study the flow patterns at different flow rate of air flow and check the performance of flat plate PBR by growing the cyanobacteria. The estimated value to produce 1g of biomass (C44.6H7O25N7.68P0.9S0.3) was 0.099g of N, 0.493g of C, 0.160 g of Na, 0.026 g of P, …
Green Thermosetting Factory: Novel Star-Shaped Bio-Based Systems And Their Thermosetting Resins; Synthesis And Characterization, Arash Jahandideh
Green Thermosetting Factory: Novel Star-Shaped Bio-Based Systems And Their Thermosetting Resins; Synthesis And Characterization, Arash Jahandideh
Electronic Theses and Dissertations
Increasing attentions toward sustainable development, economic and environmental issues have led to many attempts at replacing the petroleum-based materials with renewables. Substitution of petroleum-based platforms with green alternative technologies is beneficiary in different ways. Using bio-renewables reduces the dependency of the national plastic industry to the petroleum resources and substantially promotes the environmental profile and sustainability of the product. It is expected that the emergence of the corn-based thermosetting industry generates substantial profits for the corn production sector. Developments in the emerging biobased thermosets are spectacular from a technological point of view. However, there are still several disadvantages associated with …
Biphasic Cellulose Acetate/Rtil Membranes And Functionalized Graphene Adsorbents For Natural Gas Processing: Experimental And Molecular Simulation Studies, Amir Khakpay
Electronic Theses and Dissertations
In this dissertation, gas separation using membranes is investigated for natural gas upgrading. The main objectives of this study are separation of high value hydrocarbons such as propane (c3h8) from natural gas and carbon dioxide (co2) separation from light gases such as nitrogen (n2) and methane (ch4). To achieve these goals, supported ionic liquid membranes (silms), biphasic membranes, and nanoporous graphene (npg) and graphene oxide (npgo) membranes are studied. Biphasic membranes are proposed to overcome silms issues for gas separation. The major issues with silms are low room temperature ionic liquid (rtil) content and instability at high cross-membrane pressure. For …
A Regional Study Of Wilcox Reservoirs In The Deepwater Northern Gulf Of Mexico, Margaret Elizabeth Dice
A Regional Study Of Wilcox Reservoirs In The Deepwater Northern Gulf Of Mexico, Margaret Elizabeth Dice
Electronic Theses and Dissertations
The Deepwater Wilcox trend covers more than 34,000 mi2, extending from the northwestern block, Alaminos Canyon, to Keathley Canyon, and to the north-central block, Walker Ridge. The Wilcox trend is widely studied in the oil and gas industry as it has significant proven hydrocarbons, but has considerable economic challenges due to the reservoir characteristics. The purpose of this study is to provide a regional study of the Wilcox reservoir economics and quality. Great white field is the most successful Wilcox field located in the northwestern Gulf of Mexico and Jack and St. Malo are the most successful Wilcox fields located …
Conductive Inks And Films Via Intense Pulsed Light., Gabriel L. Draper
Conductive Inks And Films Via Intense Pulsed Light., Gabriel L. Draper
Electronic Theses and Dissertations
This research focuses on the investigation of Earth abundant copper and carbon based nanomaterials that are subjected to Intense Pulsed Light Processing to create conductive films, as future flexible electronics and renewable energy solutions would benefit from the quick and scalable production of conductive films. Use of nanomaterials in their oxide/hydroxide forms leads to higher stability in aqueous inks for efficient large area solution deposition. IPL Processing utilized 2044 μs pulses ranging from 589 J - 2070 J over an area of 1.9 cm x 30.5 cm, with energy densities of 10.1, 12.8, 15.8, 19.2, 22.9, 26.8, 31.1 and 35.7 …
Scalable Production And Applications Of Metal Oxide Nanowires., Tu Quang Nguyen
Scalable Production And Applications Of Metal Oxide Nanowires., Tu Quang Nguyen
Electronic Theses and Dissertations
Metal oxide nanowires are materials of interest in number of applications such as lithium ion batteries, solar cells, catalyst support, and gas sensing due to their unique charge transport properties and short diffusion length scales. To incorporate nanowires for any applications, one would need hundreds of grams to kilograms of these nanowires. However, state-of-the-art methods for producing metal oxide nanowires are limited to producing only milligrams to a gram in a batch. Hence, there is a need to develop scalable and cost effective processes and reactors to address this challenge. Direct gas phase oxidation of zinc metal powders using a …
Mixing And Mean Age In Multiphase Systems., David Chandler Russ
Mixing And Mean Age In Multiphase Systems., David Chandler Russ
Electronic Theses and Dissertations
Mean age theory is a useful tool for analyzing mixing by providing spatial distributions of time based data for material inside a system using a steady-state CFD approach, but has been limited to single phase systems. Mean age theory was extended here to multiphase systems by defining the scalar tracer concentration independently for individual phases, which allows mean age to be solved at steady-state for each phase independently within a multiphase system. The theory was validated by comparing multiphase mean age (MMA) distributions extracted from spatial distributions determined computationally at two locations where RTDs were experimentally measured in a water-oil …
Direct Band Gap Gallium Antimonide Phosphide (Gasbxp1-X) For Solar Fuels., Harry Benjamin Russell
Direct Band Gap Gallium Antimonide Phosphide (Gasbxp1-X) For Solar Fuels., Harry Benjamin Russell
Electronic Theses and Dissertations
Photoelectrochemical water splitting has been identified as a promising route for achieving sustainable energy future. However, semiconductor materials with the appropriate optical, electrical and electrochemical properties have yet to be discovered. In search of an appropriate semiconductor to fill this gap, GaSbP, a semiconductor never tested for PEC performance is proposed here and investigated. Density functional theory (DFT+U) techniques were utilized to predict band gap and band edge energetics for GaSbP alloys with low amount of antimony. The overall objective of this dissertation is to understand the suitability of GaSbxP1-x alloys for photoelectrochemical water splitting application. Specifically, …
Model Validation And Transition To Turbulence In Orbiting Culture Dishes., Jonathan Michael D. Thomas
Model Validation And Transition To Turbulence In Orbiting Culture Dishes., Jonathan Michael D. Thomas
Electronic Theses and Dissertations
Wall shear stress (WSS) is commonly accepted as the primary influence affecting characteristics of anchored endothelial cells when subjected to fluid flow. Orbital shakers are commonly used to study cellular responses due to their ease of use, ability to run several experiments simultaneously, and since they exert physiologically relevant oscillatory shear. These studies require comprehensive resolution of WSS, however the fluid dynamics inside orbiting culture dishes has not yet been well described since the flow is complex and difficult to quantify analytically. A computational fluid dynamics (CFD) model of flow in an orbiting dish has been developed that yields detailed …
Fully Solution Processed Pedot:Pss And Silver Nanowire Semi-Transparent Electrodes For Thin Film Solar Cells, Bjorn Vaagensmith
Fully Solution Processed Pedot:Pss And Silver Nanowire Semi-Transparent Electrodes For Thin Film Solar Cells, Bjorn Vaagensmith
Electronic Theses and Dissertations
Building integrated photovoltaics (BIPV), such as semitransparent organic solar cells (OSC) for power generating windows, is a promising method for implementing renewable energy under the looming threat of depleting fossil fuels. OSC require a solution processed transparent electrode to be cost effective; but typically employ a nonsolution processed indium tin oxide (ITO) transparent electrode. PEDOT:PSS and silver nanowire transparent electrodes have emerged as a promising alternative to ITO and are solution processed compatible. However, PEDOT:PSS requires a strong acid treatment, which is incompatible with high throughput solution processed fabrication techniques. Silver nanowires suffer from a short lifetime when subject to …
Dynamic And Thermal Properties Of Cellulose Nanocrystal/Epoxy Nanocomposites, Jaeyong Shin
Dynamic And Thermal Properties Of Cellulose Nanocrystal/Epoxy Nanocomposites, Jaeyong Shin
Electronic Theses and Dissertations
No abstract provided.
Reverse-Selective Behavior Of The Room Temperature Ionic Liquid Based Membranes, Amir Khakpay
Reverse-Selective Behavior Of The Room Temperature Ionic Liquid Based Membranes, Amir Khakpay
Electronic Theses and Dissertations
This experimental study explore the reverse-selective potential of RTIL based membranes by lowering the solubility of the non-condensing gases like N2 and CH4. It explored reverse-selectivity by measuring the permeance of carbon dioxide, nitrogen, methane, propylene, propane, 1-butene, and butane in supported ionic liquid membranes (SILM). Particular attention was given to the reverse-selective behavior in the propane/methane and propane/nitrogen separations. For this purpose, a series of experiments were conducted in a batch gas permeance system. The permeance of the above-mentioned gases was obtained using polyvinylidene fluoride (PVDF) as the support and [emim][Tf2N], [emim][BF4], [emim][TfO], [emim][DCA], [emim][SCN], and [bmim][NO3] as immobilized …
Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization, Poh Lee Cheah
Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization, Poh Lee Cheah
Electronic Theses and Dissertations
To date, enormous studies on admicellar polymerization have been recorded since the initial reports in the 1980’s. This technique which offered the advantage of using inexpensive materials and facile procedures, proven to be a successful surface modification technique. Nevertheless, one has to tailor every particular case due to the contribution of various factors in the process. Therefore, understanding the fundamentals parameters affecting the characteristics of polymer formed by admicellar polymerization have become a great interest. The effect of oxygen on the requisite amount of initiator and the polymer formed through the admicellar polymerization of styrene on silica particles was studied …
New Visible Light Absorber For Solar Fuels : Ga(Sbx)N1-X Alloys., Swathi Sunkara
New Visible Light Absorber For Solar Fuels : Ga(Sbx)N1-X Alloys., Swathi Sunkara
Electronic Theses and Dissertations
Solar energy conversion to fuels via photoelectrochemical water splitting is one of the most important technological directions toward meeting the global energy and environmental challenge. However, till date, there are no suitable semiconductor materials available that can absorb visible light, possess right kind of band edge energetics and are stable in aqueous environments. In this work, a new III-V alloy material Ga(Sbx)N1-x with dilute antimony concentration is proposed and developed for photoelectrochemical water splitting. Experimental studies were conducted first to synthesize the proposed alloy materials to understand structure-property relationships and compare them to those obtained using first principles computations. Finally, …
Heat Transfer Mechanisms In Water-Based Nanofluids., Masoudeh Ahmadi
Heat Transfer Mechanisms In Water-Based Nanofluids., Masoudeh Ahmadi
Electronic Theses and Dissertations
Nanofluids are a class of heat transport fluids created by suspending nano-scaled metallic or nonmetallic particles into a base fluid. Some experimental investigations have revealed that the nanofluids have remarkably higher thermal conductivities than those of conventional pure fluids and are more suited for practical application than the existing techniques of heat transfer enhancement using millimeter and/or micrometer-sized particles in fluids. Use of nanoparticles reduces pressure drop, system wear, and overall mass of the system leading to a reduction in costs over existing enhancement techniques. In this work, the heat transfer coefficient is determined experimentally using copper oxide (CuO) based …
Plasma Catalysis Using Low Melting Point Metals., Maria Carreon
Plasma Catalysis Using Low Melting Point Metals., Maria Carreon
Electronic Theses and Dissertations
Plasma catalysis is emerging as one of the most promising alternatives to carry out several reactions of great environmental importance, from the synthesis of nanomaterials to chemicals of great interest. However, the combined effect of a catalyst and plasma is not clear. For the particular case of 1-D nanomaterials growth, the low temperatures synthesis is still a challenge to overcome for its scalable manufacturing on flexible substrates and thin metal foils. Herein, the use of low-melting-point metal clusters under plasma excitation was investigated to determine the effectiveness in their ability to catalyze the growth of 1-D nanomaterials. Specifically, plasma catalysis …
Model Of A Tubular Perfusion Bioreactor Using Computational Fluid Dynamics., Matthew James Robeson 1991-
Model Of A Tubular Perfusion Bioreactor Using Computational Fluid Dynamics., Matthew James Robeson 1991-
Electronic Theses and Dissertations
Through recent years, many novel bioreactor designs for tissue engineering have emerged. The Tubular Perfusion System (TPS) is one such bioreactor for bone and cartilage tissue engineering. The TPS is a perfusion type bioreactor, in which media flows through a bed of scaffold beads. The advantage of this system over similar designs is that it requires no special fabrication techniques and operates at low pressure. Experimental trials have shown increased osteoblastic differentiation and mineralization of bone tissue grown using the TPS versus static culture. The effectiveness of the TPS in promoting osteoblastic differentiation is believed to be due to enhanced …
Nanoscale Electrode Architectures For Electrochemical Energy Conversion And Storage., Venkat Kalyan Vendra
Nanoscale Electrode Architectures For Electrochemical Energy Conversion And Storage., Venkat Kalyan Vendra
Electronic Theses and Dissertations
Nanoscale electrode architectures are at the heart of photoelectrochemical devices converting sunlight into electricity and electrochemical devices that store energy. Advanced nanomaterials encompassing 1-D architectures such as single crystalline metal oxide nanowires, 2-D architectures such graphene nanosheets and nanoparticle-nanowire hybrids have garnered significant interest as promising materials for fabricating thicker electrodes due their unique electronic, phase transformation and strain relaxation properties. However, electrode architectures incorporating these advanced nanomaterials will have a transformational impact on large scale electrode manufacturing only if the challenges associated with the electrode durability are addressed. At a fundamental level, the reactions happening at the electrode-electrolyte interface …
Feasibility Testing Of Chill Filtration Of Brown Spirits To Increase Product Stability., Juan Cristobal Merizalde Carrillo
Feasibility Testing Of Chill Filtration Of Brown Spirits To Increase Product Stability., Juan Cristobal Merizalde Carrillo
Electronic Theses and Dissertations
This thesis summarizes a feasibility study focused on filtering American whiskey, matured in new toasted and charred casks, at 25 ºF in order to remove haze which forms when product is diluted from cask strength (62% ABV) to bottling strength (40 – 50% ABV). Chill filtration is a process already implemented in the brown spirits industry in order to guarantee the stability of products at different ethyl alcohol concentrations. The filtration trials and cellulose-pad performance were evaluated in terms of economics, turbidity reduction, test time, throughput, color reduction, and shelf life stability. Those trials with satisfactory overall color and stability …
The Production, Properties And Applications Of The Zinc Imidazolate, Zif-8., John L. Tatarko Jr.
The Production, Properties And Applications Of The Zinc Imidazolate, Zif-8., John L. Tatarko Jr.
Electronic Theses and Dissertations
Venna, Carreon, and Jasinski produced and characterized the first samples of the zinc imidazolate framework ZIF-8 at the University of Louisville in 2010. In this dissertation the production, properties, and applications of this unique metal-organic framework are explored. Previously, only minute laboratory amounts (1/4 gram), of ZIF-8 were produced via time-consuming and expensive processes. Production quantities have been synthesized via both a continuous and a batch process using a spray drying operation to effect separation of the solid product (ZIF-8) from the mother liquor. Approximately 85% of the mother liquor (methanol), can be recovered from the spray dryer resulting in …
Dosi In Novel Geometry Dishes, Jonathan Lawrence Lambert Jones
Dosi In Novel Geometry Dishes, Jonathan Lawrence Lambert Jones
Electronic Theses and Dissertations
Effects of hemodynamic forces on cellular response are well studied. Wall shear stress is regularly accepted as the primary hemodynamic force affecting cellular response. Hemodynamic forces studies utilize Petri dishes on orbital shakers to grow cells for the experiments since this is an easily scalable system. However, characterizing the hemodynamics is difficult since the oscillatory swirling motion creates multidirectional and variable magnitude shear throughout the dish. Thus, a novel geometry dish that could create uniaxial shear with less variation in magnitude would be advantageous for studying shear stress effects on cellular response. The purpose of this thesis was to explore …
Synthetic Materials With Redox-Triggers For Imaging And Drug Delivery, Jungeun Bae
Synthetic Materials With Redox-Triggers For Imaging And Drug Delivery, Jungeun Bae
Electronic Theses and Dissertations
Synthetic materials embedded with stimuli-responsive cleavable bonds have been extensively utilized for the development of site-targeted drug delivery system and selective imaging reporters. We developed stimuli-sensitive materials with two different redox switches including trimethyl-locked quinone propionic acid and nitrobenzyl moieties. Novel redox-sensitive polymeric nanoparticles and micelles were prepared from a synthesized monomer containing trimethyl-locked quinone propionic acid as a redox trigger. A hydrophobic cancer drug, Paclitaxel, was incorporated into the redox-responsive polymeric nanoparticles and micelles prepared from the synthesize polymers. The effect of redox stress on the nanoparticles and micelles was evaluated with a chemical reductant, sodium dithionite demonstrating that …
Carbon Dioxide Capture With Amine Functionlized Graphene Oxide, Renee Zeleszki
Carbon Dioxide Capture With Amine Functionlized Graphene Oxide, Renee Zeleszki
Electronic Theses and Dissertations
Abstract: amine functionalized graphene oxide was used as sorbent in order to achieve carbon dioxide capture. In this study, micro size graphite flakes was prepared according to modified hummers method and "hummers' method with additional kmno4." Graphene oxide was then functionalized with ethylenediamine (eda). Different purification methods for graphene oxide were studied as well as different functionalization method times. Graphite oxide and functionalized graphene oxide has been analyzed with fourier transform infrared spectroscopy (ftir) for chemical structure. Thermal gravimetric analysis (tga) was used to test co2 capture capacity. Functionalized graphene oxide that has been purified with 30 washes via centrifuge …
Phase Transformation Studies Of Metal Oxides To Dichalcogenides In 1-D Structures., Dustin Ray Cummins 1987-
Phase Transformation Studies Of Metal Oxides To Dichalcogenides In 1-D Structures., Dustin Ray Cummins 1987-
Electronic Theses and Dissertations
Recently, the use of materials with nanoscale morphologies has expanded, particularly with applications in energy conversion, catalysis, and energy storage. One drawback to single crystalline nanomaterials, especially 1D nanowires, is the difficulty in synthesizing these compounds, as the material chemistry becomes more complicated. Metal oxide nanowires can be synthesized easily and can be produced in relatively large quantities. However, more complex materials, such as metal chalcogenides, cannot typically be synthesized using facile methods, and currently very few techniques involve scalable methods. Phase transformation of metal oxides nanowires to form metal sulfides and selenides by gas-solid reactions is one viable route …
Fabrication Of A Thin Silver Nanowire Composite Film And Investigation Of A Patterning Technique., Richard S. Korte 1991-
Fabrication Of A Thin Silver Nanowire Composite Film And Investigation Of A Patterning Technique., Richard S. Korte 1991-
Electronic Theses and Dissertations
Electrically conductive polymers encompass an exciting field of research for applications in dye-sensitized solar cells (DSSC’s). DSSC’s possess several advantages over other types of solar cells. They offer the potential for high quantum efficiency, solar conversion efficiency approaching that of traditional silicon panels, rapid charge transfer kinetics for photo-excited electrons, mechanical flexibility, and cost efficient manufacturing processes. However, key drawbacks to their large scale production and performance lifetime lie in their reliance on costly indium tin oxide (ITO), fluorinated tin oxide (FTO), and platinum for electrode materials, and the mechanical fragility inherent to a liquid electrolyte layer component. Much of …
The Development Of A Laminated Copolyester Electric Guitar, Addison S. Karnes
The Development Of A Laminated Copolyester Electric Guitar, Addison S. Karnes
Electronic Theses and Dissertations
This thesis is an investigation of the fabrication and assembly methodologies employed in the development of a proof-of-principle prototype electric guitar composed of laminated copolyester. The objective of the project was to develop the processes and procedures to create an optimized physical and visual bond between layers to minimize vibratory dissipation, thus maximizing sustain. A high speed CNC router, abrasive waterjet, laser engraver-cutter, as well as various manual fabrication and assembly methods were investigated in the construction of the guitar prototypes. The lamination processes explored include low-temperature, heat-assisted pressure bonding, solvent and chemical welding, and contact adhesives. The project concluded …