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Articles 1 - 30 of 394
Full-Text Articles in Engineering
Hydrolysis Of Sodium Borohydride In Concentrated Aqueous Solution, Lin Yu, Michael Matthews
Hydrolysis Of Sodium Borohydride In Concentrated Aqueous Solution, Lin Yu, Michael Matthews
Michael A. Matthews
No abstract provided.
Evaluation Of Co2-Based Cold Sterilization Of A Model Hydrogel, A. Jiménez, J. Zhang, Michael Matthews
Evaluation Of Co2-Based Cold Sterilization Of A Model Hydrogel, A. Jiménez, J. Zhang, Michael Matthews
Michael A. Matthews
No abstract provided.
Vapor Phase Batch Hydrolysis Of Nabh4 At Elevated Temperature And Pressure, Hong Liu, Christopher Boyd, Amy Beaird, Michael Matthews
Vapor Phase Batch Hydrolysis Of Nabh4 At Elevated Temperature And Pressure, Hong Liu, Christopher Boyd, Amy Beaird, Michael Matthews
Michael A. Matthews
No abstract provided.
Sterilizing Bacillus Pumilus Spores Using Supercritical Carbon Dioxide, Jian Zhang, Sarah Burrows, Courtney Gleason, Michael Matthews, Michael Drews, Martine Laberge, Yuehuei An
Sterilizing Bacillus Pumilus Spores Using Supercritical Carbon Dioxide, Jian Zhang, Sarah Burrows, Courtney Gleason, Michael Matthews, Michael Drews, Martine Laberge, Yuehuei An
Michael A. Matthews
No abstract provided.
A Reactor Model For Hydrogen Generation From Sodium Borohydride And Water Vapor, Lin Yu, Michael Matthews
A Reactor Model For Hydrogen Generation From Sodium Borohydride And Water Vapor, Lin Yu, Michael Matthews
Michael A. Matthews
No abstract provided.
Thermal Dehydration And Vibrational Spectra Of Hydrated Sodium Metaborates, Amy Beaird, Ping Li, Hilary Marsh, W. Al-Saidi, J. Johnson, Michael Matthews, Christopher Williams
Thermal Dehydration And Vibrational Spectra Of Hydrated Sodium Metaborates, Amy Beaird, Ping Li, Hilary Marsh, W. Al-Saidi, J. Johnson, Michael Matthews, Christopher Williams
Michael A. Matthews
No abstract provided.
Removing Endotoxin From Metallic Biomaterials With Compressed Carbon Dioxide-Based Mixtures, Pedro Tarafa, Eve Williams, Samir Panvelker, Jian Zhang, Michael Matthews
Removing Endotoxin From Metallic Biomaterials With Compressed Carbon Dioxide-Based Mixtures, Pedro Tarafa, Eve Williams, Samir Panvelker, Jian Zhang, Michael Matthews
Michael A. Matthews
No abstract provided.
Compressed Carbon Dioxide (Co2) For Decontamination Of Biomaterials And Tissue Scaffolds, Pedro Tarafa, Aidaris Jiménez, Jian Zhang, Michael Matthews
Compressed Carbon Dioxide (Co2) For Decontamination Of Biomaterials And Tissue Scaffolds, Pedro Tarafa, Aidaris Jiménez, Jian Zhang, Michael Matthews
Michael A. Matthews
No abstract provided.
Compatibility Of Medical-Grade Polymers With Dense Co2, A. Jiménez, G. Thompson, Michael Matthews, T. Davis, K. Crocker, Jed Lyons, A. Trapotsis
Compatibility Of Medical-Grade Polymers With Dense Co2, A. Jiménez, G. Thompson, Michael Matthews, T. Davis, K. Crocker, Jed Lyons, A. Trapotsis
Michael A. Matthews
No abstract provided.
Electrochemical Generation Of Superoxide In Room-Temperature Ionic Liquids, Inas Alnashef, Matthew Leonard, Matthew Kittle, Michael Matthews, John Weidner
Electrochemical Generation Of Superoxide In Room-Temperature Ionic Liquids, Inas Alnashef, Matthew Leonard, Matthew Kittle, Michael Matthews, John Weidner
Michael A. Matthews
We have demonstrated that superoxide ion can be generated electrochemically in room-temperature ionic-liquid solvents. In the absence of impurities, cyclic voltammetry showed that the super oxide ion is stable in these solvents. Similar superoxide ion chemistry has previously been demonstrated in volatile and environmentally suspect aprotic solvents such as dimethyl formamide and acetonitrile. However, ionic liquids are nonvolatile and should minimize the problems of secondary solvent waste. It is proposed that the resultant superoxide ion can be used to perform low temperature oxidation of wastes. Low-temperature oxidation of waste solvents can provide a much needed alternative to high-temperature waste incinerators, …
Hydrogen Generation From Chemical Hydrides, Eyma Marrero-Alfonso, Amy Beaird, Thomas Davis, Michael Matthews
Hydrogen Generation From Chemical Hydrides, Eyma Marrero-Alfonso, Amy Beaird, Thomas Davis, Michael Matthews
Michael A. Matthews
No abstract provided.
Kinetic Models Of Concentrated Nabh4 Hydrolysis, Lin Yu, Perry Pellechia, Michael Matthews
Kinetic Models Of Concentrated Nabh4 Hydrolysis, Lin Yu, Perry Pellechia, Michael Matthews
Michael A. Matthews
No abstract provided.
Synthesis Of Carbonyl Compounds From Alcohols Using Electrochemically Generated Superoxide Ions In Rtils, Praneshwar Sethupathy, Inas Alnashef, John Monnier, Michael Matthews, John Weidner
Synthesis Of Carbonyl Compounds From Alcohols Using Electrochemically Generated Superoxide Ions In Rtils, Praneshwar Sethupathy, Inas Alnashef, John Monnier, Michael Matthews, John Weidner
Michael A. Matthews
No abstract provided.
Supercritical Carbon Dioxide And Hydrogen Peroxide Cause Mild Changes In Spore Structures Associated With High Killing Rate Of Bacilus Anthracis, Jian Zhang, Nishita Dalal, Michael Matthews, Lashanda Waller, Clint Saunders, Karen Fox, Alivn Fox
Supercritical Carbon Dioxide And Hydrogen Peroxide Cause Mild Changes In Spore Structures Associated With High Killing Rate Of Bacilus Anthracis, Jian Zhang, Nishita Dalal, Michael Matthews, Lashanda Waller, Clint Saunders, Karen Fox, Alivn Fox
Michael A. Matthews
No abstract provided.
Minimizing Water Utilization In Hydrolysis Of Sodium Borohydride: The Role Of Sodium Metaboarate Hydrates, Eyma Marrero-Alfonso, Joshua Gray, Thomas Davis, Michael Matthews
Minimizing Water Utilization In Hydrolysis Of Sodium Borohydride: The Role Of Sodium Metaboarate Hydrates, Eyma Marrero-Alfonso, Joshua Gray, Thomas Davis, Michael Matthews
Michael A. Matthews
No abstract provided.
Deliquescence Of Nabh4 From Density Functional Theory And Experiments, Ping Li, Lin Yu, Michael Matthews, Wissam Saidi, J. Johnson
Deliquescence Of Nabh4 From Density Functional Theory And Experiments, Ping Li, Lin Yu, Michael Matthews, Wissam Saidi, J. Johnson
Michael A. Matthews
No abstract provided.
Deliquescence In The Hydrolysis Of Sodium Borohydride By Water Vapor, Amy Beaird, Thomas Davis, Michael Matthews
Deliquescence In The Hydrolysis Of Sodium Borohydride By Water Vapor, Amy Beaird, Thomas Davis, Michael Matthews
Michael A. Matthews
No abstract provided.
Hydrolysis Of Sodium Borohydride With Steam, Eyma Marrero-Alfonso, Joshua Gray, Thomas Davis, Michael Matthews
Hydrolysis Of Sodium Borohydride With Steam, Eyma Marrero-Alfonso, Joshua Gray, Thomas Davis, Michael Matthews
Michael A. Matthews
No abstract provided.
A Molecular Dynamics Simulation Of The Stability-Limited Growth Mechanism Of Peptide-Mediated Gold-Nanoparticle Synthesis, Jing Yu, Matthew Becker, Gustavo Carri
A Molecular Dynamics Simulation Of The Stability-Limited Growth Mechanism Of Peptide-Mediated Gold-Nanoparticle Synthesis, Jing Yu, Matthew Becker, Gustavo Carri
Gustavo A. Carri
The bindingof a 12-residue peptide to a Au {111} surface and nanoparticles with different sizes result in various equilibrium structures and stabilities due to the surface morphology. The equilibrium structures are represented by the distance of peptide atoms to Au surface and the stabilities of peptide residues are represented by the average change of dihedral angles.
A Novel Biodiesel And Glycerol Carbonate Production Plant, Nghi Nguyen, Yasar Demirel
A Novel Biodiesel And Glycerol Carbonate Production Plant, Nghi Nguyen, Yasar Demirel
YASAR DEMIREL
Crude glycerol is the byproduct of biodiesel production plant and the economic value of glycerol may affect the profitability of the biodiesel production plant. As the production rate of bioglycerol increases, its market values drop considerably. Therefore, conversion of bioglycerol into value-added products can reduce the overall cost, hence, leading to a more economical biodiesel production plant. In a direct carboxylation reaction, CO2 reacts with glycerol to produce glycerol carbonate and water. This study presents a direct comparison of the economic analysis of the conventional biodiesel production plant and the possible next generation biodiesel-glycerol carbonate production plant. At the …
Using Thermally Coupled Reactive Distillation Columns In Biodiesel Production, Nghi Nguyen, Yaşar Demirel
Using Thermally Coupled Reactive Distillation Columns In Biodiesel Production, Nghi Nguyen, Yaşar Demirel
YASAR DEMIREL
Production of ethyl dodecanoate (biodiesel) using lauric acid and methanol with a solid acid catalyst of sulfated zirconia is studied by using two distillation sequences. In the first sequence, the methanol recovery column follows the reactive distillation column. In the second sequence, the reactive distillation and methanol recovery columns are thermally coupled. Thermally coupled distillation sequences may consume less energy by allowing interconnecting vapor and liquid streams between the two columns to elminate reboiler or condenser or both. Here we study the thermally coupled side-stripper reactive distillation and eliminate the condenser of the reactive distillation column. Both the sequences are …
Teaching Coupled Transport And Rate Processes, Yasar Demirel
Teaching Coupled Transport And Rate Processes, Yasar Demirel
YASAR DEMIREL
oupling refers to a flux occurring without its primary thermodynamic driving force; for example, mass flux without a concentration gradient called the thermal diffusion is a well-known coupled process. Coupling also refers to a flux occurring in a direction opposite to the direction imposed by its driving force; for example, a mass flux can occur from a low to a high concentration region and is called the active transport or uphill transport, such as potassium and sodium pumps coupled to chemical energy released by the hydrolysis of adenosine triphosphate (ATP) in biological systems. Although the coupled processes seem to be …
Thermodynamically Coupled Transport In Simple Catalytic Reactions, Yasar Demirel
Thermodynamically Coupled Transport In Simple Catalytic Reactions, Yasar Demirel
YASAR DEMIREL
Considerable work published on chemical reaction-diffusion systems investigates mainly mathematically coupled nonlinear differential equations. This study presents the modeling of a simple elementary chemical reaction with thermodynamically and mathematically coupled heat and mass transport with external mass and heat transfer resistances. The thermodynamic coupling refers that a flow occurs without or against its primary thermodynamic driving force, which may be a gradient of temperature or chemical potential. The modeling is based on the linear nonequilibrium thermodynamics approach and phenomenological equations by assuming that the system is in the vicinity of global equilibrium. This approach does not need detailed coupling mechanisms. …
Excess Heat Capacity Surfaces For Water-Alkanol Mixtures By The Uniquac Model, Dr Y. Demirel
Excess Heat Capacity Surfaces For Water-Alkanol Mixtures By The Uniquac Model, Dr Y. Demirel
YASAR DEMIREL
Hydroorganic mixtures are industrial solvents that can serve as media to solubilize either water in hydrocarbon or a hydrophobic substance in water. In many cases the solubilizing capability is obtained via a homogeneous complex aqueous mixtures containing an alcohol. Since excess heat capacity CPE, is very sensitive to structural changes in mixtures, concentration and temperature dependence of CPE have been calculated by using the UNIQUAC model for the mixtures methanol(l)-water(%, ethanol(l)-water(2), and l-propanol(l)-water(2). The temperature-dependent parameters of the model estimated directly from CPE data at more than one different isotherm are used in the calculations. The overall deviations between the …
Donor--Acceptor Conjugated Polymer Based On Naphtho [1, 2-C: 5, 6-C] Bis [1, 2, 5] Thiadiazole For High-Performance Polymer Solar Cells, Ming Wang, Xiaowen Hu, Peng Liu, Wei Li, Xiong Gong, Fei Huang, Yong Cao
Donor--Acceptor Conjugated Polymer Based On Naphtho [1, 2-C: 5, 6-C] Bis [1, 2, 5] Thiadiazole For High-Performance Polymer Solar Cells, Ming Wang, Xiaowen Hu, Peng Liu, Wei Li, Xiong Gong, Fei Huang, Yong Cao
Xiong Gong
Donor–acceptor conjugated polymers PBDT-DTBT and PBDT-DTNT, based on 2,1,3-benzothiadiazole (BT) and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NT), have been designed and synthesized for polymer solar cells. NT contains two fused 1,2,5-thiadiazole rings that lower the band gap, enhance the interchain packing, and improve the charge mobility of the resulting polymer. Consequently, the NT-based polymer PBDT-DTNT exhibited considerably better photovoltaic performance with a power conversion efficiency (PCE) of 6.00% when compared with the BT-based polymer PBDT-DTBT, which gave a PCE of 2.11% under identical device configurations.
Synthesis Of Tetrachloro-Azapentacene As An Ambipolar Organic Semiconductor With High And Balanced Carrier Mobilities, Cheng-Li Song, Chong-Bo Ma, Feng Yang, Wei-Jing Zheng, Hao-Li Zhang, Xiong Gong
Synthesis Of Tetrachloro-Azapentacene As An Ambipolar Organic Semiconductor With High And Balanced Carrier Mobilities, Cheng-Li Song, Chong-Bo Ma, Feng Yang, Wei-Jing Zheng, Hao-Li Zhang, Xiong Gong
Xiong Gong
Two new azapentacene derivatives 9,10-dibromo-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (a) and 8,9,10,11-tetrachloro-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (b) were synthesized, and their FET properties were investigated. Compound b exhibits high and balanced ambipolar transport properties, with the hole and electron mobilities reaching up to 0.12 and 0.14 cm2 V–1 s–1, respectively. This work suggests that chlorination to the N-heteropentacene framework is an efficient way for producing high performance ambipolar organic semiconductors.
Zinc Oxide Nanowire As An Electron-Extraction Layer For Broadband Polymer Photodetectors With An Inverted Device Structure, Tingbin Yang, Ke Sun, Xilan Liu, Wei Wei, Tianzhi Yu, Xiong Gong, Deli Wang, Yong Cao
Zinc Oxide Nanowire As An Electron-Extraction Layer For Broadband Polymer Photodetectors With An Inverted Device Structure, Tingbin Yang, Ke Sun, Xilan Liu, Wei Wei, Tianzhi Yu, Xiong Gong, Deli Wang, Yong Cao
Xiong Gong
We report the fabrication of high-performance broadband polymer photodetectors based on narrow bandgap conjugated polymers with an inverted device structure, where electrons and holes are collected on indium tin oxide and metal contact with high work function. High-quality wide bandgap vertically aligned ZnO nanowire array offers an enhanced surface area and is used as the cathode buffer layer in this device for effectively extracting electrons and blocking holes from the active polymer layer. The room-temperature detectivity of polymer photodetectors with such an inverted device structure is greater than 1010 Jones with the spectral response from 400 to 1450 nm. Our …
Methods And Devices Comprising Soluble Conjugated Polymers, Xiong Gong
Methods And Devices Comprising Soluble Conjugated Polymers, Xiong Gong
Xiong Gong
Methods, compositions and articles of manufacture involving soluble conjugated polymers are provided. The conjugated polymers have a sufficient density of polar substituents to render them soluble in a polar medium, for example water and/or methanol. The conjugated polymer may desirably comprise monomers which alter its conductivity properties. In some embodiments, the inventors have provided cationic conjugated polymers (CCPs) comprising both solubilizing groups and conductive groups, resulting in conductive conjugated polymers soluble in polar media. The different solubility properties of these polymers allow their deposition in solution in multilayer formats with other conjugated polymers. Also provided are articles of manufacture comprising …
Solution-Processed Near-Infrared Polymer Photodetectors With An Inverted Device Structure, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, I-Fan Hsieh, Stephen Cheng, Xiong Gong
Solution-Processed Near-Infrared Polymer Photodetectors With An Inverted Device Structure, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, I-Fan Hsieh, Stephen Cheng, Xiong Gong
Xiong Gong
Solution-processed near-infrared polymer photodetectors with an inverted device structure were designed and fabricated. By introducing ZnOx and MoO3 as an electron extraction layer and a hole extraction layer, respectively, the asymmetric characteristics of the inverted polymer photodetectors was constructed. Operating at room temperature, the inverted polymer photodetectors exhibited the detectivity over 1012 cm Hz1/2/W from 400 to 850 nm, resulting from the enhanced photocurrent and reduced dark current induced by fabricating photoactive layer from solution with processing additive 1,8-diiodooctane. These device performances were comparable to those of inorganic counterparts.
Multilayer Polymer Light-Emitting Diodes For Solid State Lighting Applications, Xiong Gong
Multilayer Polymer Light-Emitting Diodes For Solid State Lighting Applications, Xiong Gong
Xiong Gong
Multilayer polymer light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as the emissive layer and one or both of an electron transport layer and a hole transparent layer on the appropriate electron injection and hole injection sides of the emissive layer. The transport layers reduce energy potential gaps between the hole injection electrode and the emissive polymer and between the electron injection electrode and the emissive polymer. A solvent-processing based procedure for preparing these devices is also disclosed It uses nonpolar solvent-based solutions of emissive polymers to form the emissive layer and polar solvent-based solutions to …