Cross-Linking Amyloid Forming Proteins For Improved Understanding Of Early Aggregation,
2018
University of Arkansas, Fayetteville
Cross-Linking Amyloid Forming Proteins For Improved Understanding Of Early Aggregation, Gram Booth
Chemical Engineering Undergraduate Honors Theses
Alzheimer’s disease is the only disease in the ten leading causes of death in the United states that cannot be slowed, prevented, or cured. Alzheimer’s dementia and type II diabetes are the top two diseases caused by improper protein folding, aggregation, and deposition of fibrillar plaques in tissues. These plaques, originally thought to be the cause of these diseases, have been discovered to be mostly benign and representative of the later stages of the disease. The smaller, more soluble oligomeric aggregates are responsible for the death of pancreatic and neural cells. Many oligomeric species are unstable and exist only for …
A Proposed Process And Economic Analysis For A Manufacturing Facility For Nylon 6,6,
2018
University of Arkansas, Fayetteville
A Proposed Process And Economic Analysis For A Manufacturing Facility For Nylon 6,6, Perry Doles
Chemical Engineering Undergraduate Honors Theses
The global nylon market is a multi-billion-dollar industry that has been thriving in recent years due to advances in the process technology and its flexibility as a material. Nylon 6,6 is a versatile material with uses in many industries because of its ability manipulated into many forms. It is commonly used in applications that require heat resistance, chemical resistance, and high mechanical strength. It is commonly used in luggage, car parts, carpets, and many other plastic products that require the properties that nylon 6,6 exhibits. The versatility and demand for nylon 6,6 make it an attractive process for many potential …
Thermal Removal Of Carbon Dioxide From The Atmosphere: Energy Requirements And Scaling Issues,
2018
Embry-Riddle Aeronautical University
Thermal Removal Of Carbon Dioxide From The Atmosphere: Energy Requirements And Scaling Issues, Ted Von Hippel
Publications
I conduct a systems-level study of direct air capture of CO2 using techniques from thermal physics. This system relies on a combination of an efficient heat exchanger, radiative cooling, and refrigeration, all at industrial scale and operated in environments at low ambient temperatures. While technological developments will be required for such a system to operate efficiently, those developments rest on a long history of refrigeration expertise and technology, and they can be developed and tested at modest scale. I estimate that the energy required to remove CO2 via this approach is comparable to direct air capture by other techniques. The …
Comparison Between Cold/Hot Smart Water Flooding In Sandstone Reservoirs,
2018
Missouri University of Science and Technology
Comparison Between Cold/Hot Smart Water Flooding In Sandstone Reservoirs, Hasan N. Al-Saedi, Ariel Williams, Ralph E. Flori
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The incremental oil recovery has been investigated and approved by many laboratory and field projects using water flooding in tertiary stage. The salinity of the injected water is an important factor observed by many researchers. The more salinity decreases the more oil recovery obtained. The investigations on the hot low salinity water flooding have been conducted by many researchers and they found out that it is useful for increasing oil recovery especially heavy oil due to reducing oil viscosity and make it easy to produce to the surface. The thermal expansion of water plays an important role in the incremental …
Comparing Stenotic Blood Flow In Three- And Two-Dimensional Arterial Renderings Using Computational Fluid Dynamics And Multiphase Mean Age Theory.,
2018
University of Louisville
Comparing Stenotic Blood Flow In Three- And Two-Dimensional Arterial Renderings Using Computational Fluid Dynamics And Multiphase Mean Age Theory., Jacob S. Garza
Electronic Theses and Dissertations
Over one million invasive coronary angiography procedures are performed annually in patients who experience chest pain or are known to have coronary artery disease. The procedure is carried out to ascertain the degree of arterial blockage (stenosis) that hinders blood flow to the heart. A cardiologist performing the procedure determines the physiological degree of a stenosis by either visual estimation, which is routine practice, or by invasively measuring fractional flow reserve (FFR), which is the current gold standard that has been demonstrated to improve patient outcomes and temper the cost of healthcare. Nevertheless, FFR is performed in only 10–20% of …
Enhancing Performance Of Ionic Liquid Property Prediction With Molecular Dynamics.,
2018
University of Louisville
Enhancing Performance Of Ionic Liquid Property Prediction With Molecular Dynamics., Trisha H. Patel
Electronic Theses and Dissertations
Molecular dynamics have been used to predict thermodynamic and transport properties of eight room-temperature ionic liquids. Simulation parameters including box size and van der Waals cutoffs were varied. The density, heat capacity, and self-diffusion coefficients of the ionic liquids were computed and compared to experimental data and to previously published simulations. Predicted properties were generally close to their experimentally observed values. It was determined that the prediction of ionic liquid properties via molecular dynamics simulations could be accelerated several-fold by using less stringent integration parameters and smaller simulation sizes. The properties of density and heat capacity did not change significantly …
Development Of Microdialysis Probes In Series Approach Toward Eliminating Microdialysis Sampling Calibration: Miniaturization Into A Pdms Microfluidic Device,
2018
University of Arkansas, Fayetteville
Development Of Microdialysis Probes In Series Approach Toward Eliminating Microdialysis Sampling Calibration: Miniaturization Into A Pdms Microfluidic Device, Randy Espinal Cabrera
Graduate Theses and Dissertations
A new microdialysis sampling method and microfluidic device were developed in vitro. The method consisted of using up to four microdialysis sampling probes connected in series to evaluate the relative recovery (RR) of different model solutes methyl orange, fluorescein isothiocyanate (FITC)-dextran average mol. wt. 4,000 (FITC-4), FITC-10, FITC-20, and FITC-40. Different flow rates (0.8, 1.0, and 1.5 µL/min) were used to compare experimentally observed relative recoveries with theoretical estimations. With increasing the number of probes in series, the relative recovery increases and ~100% (99.7% ± 0.9%) relative recovery for methyl orange was obtained. For larger molecules such as fluorescein isothiocyanate …
Characterization Of Bacteriorhodopsin And Halorhodopsin Reconstituted In Lipid Bilayer Membranes,
2018
University of Arkansas, Fayetteville
Characterization Of Bacteriorhodopsin And Halorhodopsin Reconstituted In Lipid Bilayer Membranes, Joel Domkam Kamwa
Graduate Theses and Dissertations
Motivated to produce electricity with photon activated ion pumps, the main purpose of this work was to characterize the photosynthetic membrane proteins bacteriorhodopsin (proton pump) and halorhodopsin (chloride pump). The proteins were re-suspended in lipid bilayers. For this work, an experimental set-up was built which included: chambers for lipid bilayer formation and characterization, lasers for ion pump activation, and an AxoPatch electrophysiology system for small photocurrent measurement. Lipid bilayer membranes were formed using mostly folding method: folding two monolayers together. The membranes were characterized by their resistance, capacitance, and generated photocurrent. Photocurrent was generated upon illumination of lipid-protein membranes with …
Effects Of Rotating Magnetic Fields On Pem Fuel Cell Performance,
2018
College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 20090
Effects Of Rotating Magnetic Fields On Pem Fuel Cell Performance, Mao-Liang Wu, En-Ze Wang, Guang-De Pan, Zhong-Jun Liu, Fei Xie
Journal of Electrochemistry
Proton Exchange Membrane (PEM) fuel cell performance may be improved by application of additional magnetic fields. In this work, one square permanent magnet, made of either 16 combination cylinder magnets with homopolarity or 16 combination cylinder magnets with heteropolarity, was exerted on the fuel cell surface to produce additional magnetic field affecting PEM fuel cell performance. The influences of magnetic field status (rotating, static and none) on polarization and power density curves measured in a PEM fuel cell were investigated. The results verified the benefit of magnetic field, proving that the magnetic field distribution could improve the fuel cell output. …
Preparation Of Ni(Dpim)2Cl2 Complex For The Electrocatalytic Reduction Of Co2,
2018
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
Preparation Of Ni(Dpim)2Cl2 Complex For The Electrocatalytic Reduction Of Co2, Li-Pu Zhang, Dong-Fang Niu, Xin-Sheng Zhang
Journal of Electrochemistry
A new Ni(dpim)2Cl2complex using 2-(diphenylphosphino)-1-methylimidazole (dpim) as ligand was prepared and served as a catalyst for the electrochemical reduction of CO2. The electrochemical redox behavior of Ni(dpim)2Cl2 in CH3CN/TPABF4 solution under nitrogen atmosphere showed the two-electron irreversible reduction at -0.7 V and one-electron quasi-reversible reduction at -1.3 V. After bubbling CO2 into the electrolyte, the reduction peak appeared at -1.3 V became irreversible and the peak current increased from 0.48 mA·cm-2 to 0.55 mA·cm-2. Moreover, the peak current at -1.3 V could further increase …
Preparation Of Co3O4/Ti Electrocatalytic Membrane Electrode For Catalytic Oxidation Of Benzyl Alcohol,
2018
State Key Laboratory of Separation Membranes and Membrane Processes/Separation Membrane Science and Technology International Joint Research Centre, Tianjin Polytechnic University, Tianjin 300387, China;School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;
Preparation Of Co3O4/Ti Electrocatalytic Membrane Electrode For Catalytic Oxidation Of Benzyl Alcohol, Yu-Mei Zheng, Zhen Yin, Hong Wang, Jian-Xin Li
Journal of Electrochemistry
The cobalt oxide(Co3O4) nanoparticles were loaded on microporous Ti membrane to prepare Co3O4/Ti electrocatalytic membrane electrode by dip-coating method. The microstructures and electrochemical properties of Co3O4/Ti electrocatalytic membrane were investigated. The Co3O4/Ti electrocatalytic membrane reactor (ECMR) assembled by using the Co3O4/Ti electrocatalytic membrane as an anode was adopted for catalytic oxidation of benzyl alcohol to produce benzaldehyde and benzoic acid.The effects of different operation parameters on benzyl alcohol conversion, and selectivity to benzaldehyde and benzoic acid of ECMR were studied. …
Interaction Between Energy And Electrocatalysis —— A Review On The 1st Young Scientist Forum On Energy Electrocatalysis,
2018
Department of Chemistry, Fudan University, Shanghai 200438, China;
Interaction Between Energy And Electrocatalysis —— A Review On The 1st Young Scientist Forum On Energy Electrocatalysis, Hong Li, Wen-Bin Cai
Journal of Electrochemistry
No abstract provided.
Preparation And Properties Of Manganese Oxide And Polyaniline-Carbon Composite Electrode,
2018
Key Laboratory of Photochemistry Biological Materials and Energy Story Materials, Heilongjiang Province; College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, Heilongjiang, China;
Preparation And Properties Of Manganese Oxide And Polyaniline-Carbon Composite Electrode, Tian-Tian Zhou, Bing Wu, Chao Deng, Ying Gao
Journal of Electrochemistry
The polyaniline-carbon (PAnC) electrode was prepared by the polymerization of aniline monomer and activated carbon in ice water bath, and followed by chemical deposition of manganese dioxide MnO2-PAnC composite material. The specific capacitance of MnO2-PAnC reached 459 F•g-1. The cyclic voltammetric results showed a small deformation in the voltammogram curve obtained with the MnO2-PAnC electrode at high scan rate, indicating good reversibility and capacitive properties. The AC impedance results revealed that the MnO2-PAnC electrode displayed the smallest charge transfer resistance and the fastest diffusion
rate of surface ions than other …
Simulation Analysis In Dynamic Performance Of Proton Exchange Membrane Fuel Cell Under Starting Condition,
2018
School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China;
Simulation Analysis In Dynamic Performance Of Proton Exchange Membrane Fuel Cell Under Starting Condition, Yan Xiao, Ying-Jie Chang, Wei Zhang, Qiu-Hong Jia
Journal of Electrochemistry
Based on the equivalent circuit model, by considering both the dynamic gas pressure model and the dynamic heat transfer model, a lumped parameter model is developed. The start process of the fuel cell is simulated by using SIMULINK software. The undershoot of the voltage is observed from the simulation results, and the response time of the voltage is basically the same as that of the fuel cell temperature, which indicates that the temperature has great influence on the dynamic performance of the fuel cell. From the perspective of the temperature, the dynamic responses of the thermodynamic potential, the activation overvoltage, …
Electrochemical Oxidation Of P-Chlorophenol On Porous Ti/Bdd Electrode Cooperated With Cathode Dechlorination,
2018
College of Chemistry, Jilin University, Changchun 130012, China;
Electrochemical Oxidation Of P-Chlorophenol On Porous Ti/Bdd Electrode Cooperated With Cathode Dechlorination, Rong-Ling Chen, Wei-Min Huang, Ya-Peng He, Jun Shi, Hai-Bo Lin
Journal of Electrochemistry
The electrochemical oxidation of p-chlorophenol on porous Ti/BDD electrode cooperated with synergistic effect of cathode dechlorination was studied. Electrochemical degradation tests of p-chlorophenol were conducted in single and double compartment electrolytic cells separately, and the results showed that the mineralization happened mainly in the anode region. The product of chloride ions produced from the cathodic reduction of 4-chlorophenol in the single cell migrated to the anode region and further generated active chlorine toward electro-catalytic oxidation. At the same time, the chloride ion produced from the cathode of the double cell was difficult to be migrated to the anode region, which …
Synthesis And Electrochemical Properties Of Li3V2(Bo3)3/C Anode Materials For Lithium-Ion Batteries,
2018
Department of Materials and Environmental Engineering, Hezhou University, Hezhou 542899, Guangxi, China; Department of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China;
Synthesis And Electrochemical Properties Of Li3V2(Bo3)3/C Anode Materials For Lithium-Ion Batteries, You Wang, Yi-Wen Zeng, Xing Zhong, Xing Liu, Quan Tang
Journal of Electrochemistry
The Li3V2(BO3)3/C (LVB/C) composite materials were successfully synthesized in two steps:Firstly, a stoichiomertric mixture of Li2C2O4, V2O5, H3BO3, H2C2O4•H2O and ethanol was thoroughly ball-milled to get the precursors. Secondly, the precursors were post-calcinated to get the ultimate products. The calcination temperatures of 750 ℃, 800 ℃ and 850 ℃ were selected based on TG-DTA analyses. The crystal structures, surface morphologies and carbon contents of the samples calcinated at five conditions, …
Marangoni Flows During Nonsolvent Induced Phase Separation,
2018
Brigham Young University - Provo
Marangoni Flows During Nonsolvent Induced Phase Separation, Douglas R. Tree, Tatsuhiro Iwama, Kris T. Delaney, Joshua Lee, Glenn H. Fredrickson
Faculty Publications
Motivated by the much discussed, yet unexplained, presence of macrovoids in polymer membranes, we explore the impact of Marangoni flows in the process of nonsolvent induced phase separation. Such flows have been hypothesized to be important to the formation of macrovoids, but little quantitative evidence has been produced to date. Using a recently developed multifluid phase field model, we find that roll cells indicative of a solutal Marangoni instability are manifest during solvent/nonsolvent exchange across a stable interface. However, these flows are weak and subsequently do not produce morphological features that might lead to macrovoid formation. By contrast, initial conditions …
Nanoreactors: Strategies To Encapsulate Enzyme Biocatalysts In Virus-Like Particles,
2018
Brigham Young University - Provo
Nanoreactors: Strategies To Encapsulate Enzyme Biocatalysts In Virus-Like Particles, Joshua W. Wilkerson, Seung-Ook Yang, Parker J. Funk, Steven K. Stanley, Bradley Charles Bundy
Faculty Publications
Enzyme-mediated biocatalysis is generally more selective and environmentally friendly and requires less energy than chemocatalysis. However, factors such as temperature, acidity and the presence of proteases can negate enzyme activity. Encapsulation in virus-like particles is one promising method to mitigate these difficulties. Encapsulation also can be used to create multi-reaction nanoreactors that increase process efficiency by isolating reaction intermediates. To successfully encapsulate enzymes, a variety of methods involving both non-covalent and covalent interactions have been developed. Here we review promising virus-like particle encapsulation strategies, their advantages and remaining challenges.
Waste Vegetable Oil Properties With Usage And Its Impact On Artisan Soap Making,
2018
Brigham Young University
Waste Vegetable Oil Properties With Usage And Its Impact On Artisan Soap Making, Jenalyn Thorpe
Undergraduate Honors Theses
This thesis examines the impact of vegetable oil usage in industrial and home settings on the properties of the vegetable oil and how its usage in soap affects the final product. Waste vegetable oil (WVO) is often used to make soap as a way to be more environmentally-friendly and create soap at a low cost in developing countries. Two settings are examined: home usage (i.e. short-term, small-scale usage) and industrial (i.e. long-term, almost continuous usage). This thesis found that lightly used oil (household use) had little to no impact on the quality of the oil, except for its scent. This …
Multienzyme Immobilized Polymeric Membrane Reactor For The Transformation Of A Lignin Model Compound,
2018
University of Kentucky
Multienzyme Immobilized Polymeric Membrane Reactor For The Transformation Of A Lignin Model Compound, Rupam Sarma, Md. Saiful Islam, Mark P. Running, Dibakar Bhattacharyya
Chemical and Materials Engineering Faculty Publications
We have developed an integrated, multienzyme functionalized membrane reactor for bioconversion of a lignin model compound involving enzymatic catalysis. The membrane bioreactors were fabricated through the layer-by-layer assembly approach to immobilize three different enzymes (glucose oxidase, peroxidase and laccase) into pH-responsive membranes. This novel membrane reactor couples the in situ generation of hydrogen peroxide (by glucose oxidase) to oxidative conversion of a lignin model compound, guaiacylglycerol-β-guaiacyl ether (GGE). Preliminary investigation of the efficacy of these functional membranes towards GGE degradation is demonstrated under convective flow mode. Over 90% of the initial feed could be degraded with the multienzyme immobilized membranes …
