Controlled Release Of Corrosion Inhibitors: Zinc And Magnesium Containing Sodium Chromate,
2019
The University of Akron
Controlled Release Of Corrosion Inhibitors: Zinc And Magnesium Containing Sodium Chromate, Andrew Thomas
Williams Honors College, Honors Research Projects
Corrosion can be combated by multiple methods, where the primary purpose is to minimize degradation of metal surfaces. Corrosion inhibitors are one of the most effective methods of corrosion protection. Inhibitors are substances that minimize corrosion in aggressive environments, with only a low concentration required. The inhibitors are chemically adsorbed on the surface of the metal and a protective thin film is formed . The mechanism of the inhibitors could be described as anodic, cathodic, or a mix of the two. Anodic inhibitors, also known as passivation inhibitors, alter an anode reaction. Corrosion potential of the metal is shifted to …
Understanding Effects Of Engineering Outreach On Elementary Students,
2019
The University of Akron
Understanding Effects Of Engineering Outreach On Elementary Students, Thomas Cobb
Williams Honors College, Honors Research Projects
Currently, there is a desire to increase engineering understanding held by elementary students. As such, there needs to be a way to stimulate not only engineering, but other science, technology, engineering, and mathematics (STEM) topics in a young student’s lifestyle. One way to emphasize the importance of STEM while also showing how fun it can be is through different hands on activities led by individuals partaking in undergraduate studies or the industry. While having the students participate in the activities, it is important to understand what the students are learning and how the activity overall is viewed. With the help …
Synthesis Of Drug Encapsulated Chitosan-Heparin Based Nanoparticles And Release Study,
2019
The University of Akron
Synthesis Of Drug Encapsulated Chitosan-Heparin Based Nanoparticles And Release Study, Trent Richwine
Williams Honors College, Honors Research Projects
The main objective of this honor’s project is to encapsulate drugs with different molecular weights inside of chitosan-heparin based nanoparticles (Cs-Hep NPs). Three different drugs with low (NNC), medium (IFN-γ), and large (BSA) molecular weights were chosen in order to compare all types of drugs and how they react with the nanoparticles. Analysis of particle size, zeta potential, and a release study was performed. The release took place over a 168-hour time period and liquid samples were taken throughout. The hypothesis was that the molecular weight of the drug will correlate to the physical properties of the nanoparticles. The results …
Compression Set Improvement Of Thermoplastic Vulcanizates For High Temperature Tubing,
2019
The University of Akron
Compression Set Improvement Of Thermoplastic Vulcanizates For High Temperature Tubing, Mitchell Valaitis
Williams Honors College, Honors Research Projects
It was hypothesized that increasing the curative level of the fluorocarbon rubber (FKM) used in manufacturing of thermoplastic vulcanizate (TPV) materials would decrease the compression set values of the TPV enough for it to be suitable as a flexible, lightweight alternative to high operating temperature thermoset rubber tubing currently being used for power steering hose. First, promising TPV formulations were identified by varying the polyamide (PA) and FKM used in a Brabender mixer. Four different types of polyamide and four different types of FKM were investigated, with two of the FKM types and one polyamide type identified as being promising. …
Modeling Electrospun Fibrous Materials,
2019
Virginia Commonwealth University
Modeling Electrospun Fibrous Materials, Sina Hassanpouryousefi
Theses and Dissertations
Electrospinning has been the focus of countless studies for the past decades for applications, including but not limited to, filtration, tissue engineering, and catalysis. Electrospinning is a one-step process for producing nano- and/or micro-fibrous materials with diameters ranging typically from 50 to 5000 nm. The simulation algorithm presented here is based on a novel mass-spring-damper (MSD) approach devised to incorporate the mechanical properties of the fibers in predicting the formation and morphology of the electrospun fibers as they travel from the needle toward the collector, and as they deposit on the substrate. This work is the first to develop a …
Accumulation Of Di-2-Ethylhexyl Phthalate From Polyvinyl Chloride Flooring Into Settled House Dust And The Effect On The Bacterial Community,
2019
University of Oregon
Accumulation Of Di-2-Ethylhexyl Phthalate From Polyvinyl Chloride Flooring Into Settled House Dust And The Effect On The Bacterial Community, Samantha Velazquez, Chenyang Bi, Jeff Kline, Susie Nunez, Richard Corsi, Ying Xu, Suzanne L. Ishaque
Mechanical and Materials Engineering Faculty Publications and Presentations
Di-2-ethylhexyl phthalate (DEHP) is a plasticizer used in consumer products and building materials, including polyvinyl chloride flooring material. DEHP adsorbs from material and leaches into soil, water, or dust and presents an exposure risk to building occupants by inhalation, ingestion, or absorption. A number of bacterial isolates are demonstrated to degrade DEHP in culture, but bacteria may be susceptible to it as well, thus this study examined the relation of DEHP to bacterial communities in dust. Polyvinyl chloride flooring was seeded with homogenized house dust and incubated for up to 14 days, and bacterial communities in dust were identified at …
Synthesis, Characterization And Selected Application Of Chitosan-Coated Magnetic Iron Oxide Nanoparticles,
2019
Missouri University of Science and Technology
Synthesis, Characterization And Selected Application Of Chitosan-Coated Magnetic Iron Oxide Nanoparticles, M. A. Radwan, Mohamed Adel Rashad, M. A. Sadek, Hany A. Elazab
Chemical and Biochemical Engineering Faculty Research & Creative Works
In this research, we report an efficient method to prepare highly active chitosan-coated magnetic iron oxide nanoparticles by implementing co-precipitation technique which is used for wastewater treatment applications. Chitosan-coated magnetic iron oxide nanoparticles were synthesized and characterized using TEM, XRD, and XPS. A comparative study has been made between chitosan powder and chitosan coated with magnetic nanoparticles with respect to the rate of adsorption of copper from aqueous solution. It was also experimentally verified that chitosan coated magnetic iron oxide nanoparticles are much more effective in adsorption of heavy metals than chitosan powder and it takes just few minutes instead …
Modeling Cell Line-Specific Recruitment Of Signaling Proteins To The Insulin-Like Growth Factor 1 Receptor,
2019
Missouri University of Science and Technology
Modeling Cell Line-Specific Recruitment Of Signaling Proteins To The Insulin-Like Growth Factor 1 Receptor, Keesha E. Erickson, Dipak Barua, For Full List Of Authors, See Publisher's Website.
Chemical and Biochemical Engineering Faculty Research & Creative Works
Receptor tyrosine kinases (RTKs) typically contain multiple autophosphorylation sites in their cytoplasmic domains. Once activated, these autophosphorylation sites can recruit downstream signaling proteins containing Src homology 2 (SH2) and phosphotyrosine-binding (PTB) domains, which recognize phosphotyrosine-containing short linear motifs (SLiMs). These domains and SLiMs have polyspecific or promiscuous binding activities. Thus, multiple signaling proteins may compete for binding to a common SLiM and vice versa. To investigate the effects of competition on RTK signaling, we used a rule-based modeling approach to develop and analyze models for ligand-induced recruitment of SH2/PTB domain-containing proteins to autophosphorylation sites in the insulin-like growth factor 1 …
Pd-Fe3o4/Rgo: A Highly Active And Magnetically Recyclable Catalyst For Suzuki Cross Coupling Reaction Using A Microfluidic Flow Reactor,
2019
Missouri University of Science and Technology
Pd-Fe3o4/Rgo: A Highly Active And Magnetically Recyclable Catalyst For Suzuki Cross Coupling Reaction Using A Microfluidic Flow Reactor, Hany A. Elazab, Ali R. Siamaki, B. Frank Gupton, M. Samy El-Shall
Chemical and Biochemical Engineering Faculty Research & Creative Works
There are several crucial issues that need to be addressed in the field of applied catalysis. These issues are not only related to harmful environmental impact but also include process safety concerns, mass and heat transfer limitations, selectivity, high pressure, optimizing reaction conditions, scale-up issues, reproducibility, process reliability, and catalyst deactivation and recovery. Many of these issues could be solved by adopting the concept of micro-reaction technology and flow chemistry in the applied catalysis field. A microwave assisted reduction technique has been used to prepare well dispersed, highly active Pd/Fe3O4 nanoparticles supported on reduced graphene oxide nanosheets …
Pyrolysis Kinetics Of Live And Dead Wildland Vegetation From The Southern United States,
2019
Brigham Young University - Provo
Pyrolysis Kinetics Of Live And Dead Wildland Vegetation From The Southern United States, Elham Amini, Mohammad-Saeed Safdari, David R. Weise, Thomas H. Fletcher
Faculty Publications
The fundamental combustion behavior of live wildland vegetation is not fully understood. Since the combustion process during wildland fire starts with pyrolysis, there is a need for better understanding of pyrolysis to develop improved wildland fire models. The kinetics of pyrolysis of live and dead wildland vegetation has not been explored in detail. In this study, the pyrolysis kinetics were determined for 14 different plant species (live and dead) which are all native to the forests in the southern United States. Pyrolysis experiments were carried out in a Thermogravimetric analyzer (TGA) under inert conditions at 5 different heating rates ranged …
Investigate The Rheological Behavior Of High Viscosity Friction Reducer Fracture Fluid And Its Impact On Proppant Static Settling Velocity,
2019
Missouri University of Science and Technology
Investigate The Rheological Behavior Of High Viscosity Friction Reducer Fracture Fluid And Its Impact On Proppant Static Settling Velocity, Mohammed Ba Geri, Abdulmohsin Imqam, Andrey Bogdan, Lingjuan Shen
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The recent and rapid success of using high viscosity friction reducers (HVFRs) in hydraulic fracturing treatments is due to several advantages over other fracture fluids (e.g. linear gel), which include better proppant carrying capability, induce more complex fracture system network with higher fracture length, and overall lower costs due to fewer chemicals and less equipment on location. However, some concerns remain, like how HVFRs rheological properties can have impact on proppant transport into fractures. The objective of this study is to provide a comprehensive understanding of the influence the rheological characterization of HVFRs have on proppant static settling velocity within …
Impact Of Natural Fracture Induced Elastic Anisotropy On Completion And Hydraulic Fracturing Designs,
2019
West Virginia University
Impact Of Natural Fracture Induced Elastic Anisotropy On Completion And Hydraulic Fracturing Designs, Emre Can Dundar
Graduate Theses, Dissertations, and Problem Reports (ETD)
Shale has been usually recognized as a transverse isotropic (TI) medium in conventional geomechanical log interpretation due to its laminated nature. However, when natural fractures (NFs) exist in the rock body, additional elastic anisotropy can be introduced, converting Shale to an orthorhombic (OB) medium. Previous study illustrates that treating the naturally fractured shale rock as a TI medium by ignoring the NF-induced anisotropy can cause the erroneous estimation of the geomechanical properties (i.e. Young’s modulus, Poisson’s ratio, brittleness index, and etc.) and in-situ stress. In this paper, the study is extended to quantify the impact of NF-induced elastic anisotropy on …
Modeling Overpressure Development During Shale Rock Compaction Coupling Poroelasticity And Permeability Evolution Above 3km Depth,
2019
Missouri University of Science and Technology
Modeling Overpressure Development During Shale Rock Compaction Coupling Poroelasticity And Permeability Evolution Above 3km Depth, Wenyu Zhao
Masters Theses
"The evolution of pore pressure including overpressure during sedimentation is an important process to consider when analyzing whether high pore pressure causes rock failure. High pore pressure is caused by under-compaction due to the rapid burial of low-permeability sediments, and as a result, porosity decreases less rapidly with depth than in normally compacted sediments where porosity decreases exponentially with depth. While under-compaction related pore pressure magnitudes have been determined empirically, in most numerical modeling approaches, the pore pressure is either applied as a static magnitude or coupled to a fluid flow simulator. This study simulates the pore pressure evolution during …
Effects Of Mixing Methods Of Bifunctional Catalysts On Catalyst Stability Of Dme Synthesis Via Co₂ Hydrogenation,
2019
Missouri University of Science and Technology
Effects Of Mixing Methods Of Bifunctional Catalysts On Catalyst Stability Of Dme Synthesis Via Co₂ Hydrogenation, Shoujie Ren, Shiguang Li, Naomi Klinghoffer, Miao Yu, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
The effects of three different mixing methods of CuO/ZnO/Al2O3 (CZA) and HZSM-5 bifunctional catalyst on the stability for dimethyl ether (DME) synthesis from carbon dioxide (CO2) hydrogenation were investigated. When the bifunctional catalyst was prepared by method A (mixing powder without pelletization), there was no significant change in DME production and catalyst stability when the HZSM-5 loading was varied between 0.1 g and 0.5 g with a fixed CZA loading of 0.5 g,. When the bifunctional catalysts were prepared by method B (pressed into pellets of CZA and pellets of HZSM-5 and then mixed) and …
Facile Synthesis Of Reduced Graphene Oxide-Supported Pd/Cuo Nanoparticles As An Efficient Catalyst For Cross-Coupling Reactions,
2019
Missouri University of Science and Technology
Facile Synthesis Of Reduced Graphene Oxide-Supported Pd/Cuo Nanoparticles As An Efficient Catalyst For Cross-Coupling Reactions, Hany A. Elazab, M. A. Sadek, Tamer T. El-Idreesy
Chemical and Biochemical Engineering Faculty Research & Creative Works
The present communication reports a scientific investigation of a simple and versatile synthetic route for the synthesis of palladium nanoparticles decorated with copper oxide and supported on reduced graphene oxide (rGO). They are used as a highly active catalyst of Suzuki, Heck, and Sonogashira cross coupling reactions with a remarkable turnover number of 7000 and a turnover frequency of 85000 h-1. The Pd-CuO nanoparticles supported on reduced graphene oxide nanosheets (Pd-CuO/rGO) exhibit an outstanding performance through a high catalytic activity towards cross coupling reactions. A simple, reproducible, and reliable method is used to prepare this efficient catalyst using microwave irradiation …
Magnetic Composite Biomaterials For Neural Regeneration,
2019
Missouri University of Science and Technology
Magnetic Composite Biomaterials For Neural Regeneration, Jessica L. Funnell, Bailey Balouch, Ryan J. Gilbert
Chemical and Biochemical Engineering Faculty Research & Creative Works
Nervous system damage caused by physical trauma or degenerative diseases can result in loss of sensory and motor function for patients. Biomaterial interventions have shown promise in animal studies, providing contact guidance for extending neurites or sustained release of various drugs and growth factors; however, these approaches often target only one aspect of the regeneration process. More recent studies investigate hybrid approaches, creating complex materials that can reduce inflammation or provide neuroprotection in addition to stimulating growth and regeneration. Magnetic materials have shown promise in this field, as they can be manipulated non-invasively, are easily functionalized, and can be used …
New Correlation For Calculating Acentric Factor Of Petroleum 2 Fractions,
2019
The British University in Egypt
New Correlation For Calculating Acentric Factor Of Petroleum 2 Fractions, Samir Khaled
Petroleum Engineering and Gas
A proper description of the physical properties of the petroleum fractions in hydrocarbon mixtures is 12 essential in performing reliable phase behavior calculations and compositional modeling studies. This 13 paper presents a comparison study among five different correlations used to calculate the acentric 14 factor of undefined petroleum fractions. A new correlation was developed for calculating the acentric 15 factor of undefined petroleum fractions, a function of no carbon atoms with an average error of 0.099 16 and a correlation coefficient of 0.998.
Electro-Deposited Polyaniline On Tio2 As A Photoanode For Improved Photoelectrochemical Performance In Water Oxidation And Methylene Blue,
2019
Faculty of Engineering
Electro-Deposited Polyaniline On Tio2 As A Photoanode For Improved Photoelectrochemical Performance In Water Oxidation And Methylene Blue, Reeda Jamsri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Polyaniline (PANI) deposited on TiO2 as a photoanode has been synthesized by the electro-polymerization method. The electrodeposition was performed in aqueous solutions containing 0.5 M aniline and 1 M H2SO4 at a constant current density. The photoanode demonstrated its potential applications for photocatalytic degradation of methylene blue dye (MB) and photoelectrochemical (PEC) water splitting. A ~2.7 fold enhancement in the photodegradation activity at 0.9V vs. Ag/AgCl of a bias voltage and the high water oxidation photocurrent density of PANI/TiO2 on FTO photoanode achieves 1.3 mA cm-2 at 0.6V vs. Ag/AgCl under illumination which is higher than that pure TiO2 on …
กัมมันตภาพและเสถียรภาพของ Ptiro2 รองรับด้วยท่อนาโนคาร์บอนที่หุ้มพอลิแอนิลีนสำหรับเซลล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้,
2019
คณะวิทยาศาสตร์
กัมมันตภาพและเสถียรภาพของ Ptiro2 รองรับด้วยท่อนาโนคาร์บอนที่หุ้มพอลิแอนิลีนสำหรับเซลล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้, ลดาวรรณ์ ธูปชัย
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้เป็นการศึกษาผลของตัวรองรับต่อกัมมันตภาพและเสถียรภาพของตัวเร่งปฏิกิริยาแพลทินัมอิริเดียมออกไซด์ในเซลล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้ ตัวรองรับที่ใช้ในการทดสอบ ได้แก่ คาร์บอนวัลแคน (C) ท่อนาโนคาร์บอน (CNTs) และท่อนาโนคาร์บอนที่หุ้มพอลิแอนิลีน (CNTs-PANI) พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI มีกัมมันตภาพในการเร่งปฏิกิริยามากที่สุดทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน โดยความหนาแน่นเชิงจลนพลศาสตร์สำหรับปฏิกิริยารีดักชันของออกซิเจน ที่ 0.6 โวลต์เทียบกับศักย์ไฟฟ้ามาตรฐานคาโลเมล เท่ากับ 1.24 มิลลิแอมแปร์ต่อตารางเซนติเมตร และปฏิกิริยาการเกิดออกซิเจน ที่ 1.55 โวลต์เทียบกับศักย์ไฟฟ้ามาตรฐานคาโลเมล เท่ากับ 41.36 มิลลิแอมแปร์ต่อตารางเซนติเมตร หลังผ่านการทดสอบเสถียรภาพในสารละลายกรดซัลฟิวริก จำนวน 1000 รอบ พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI มีการลดลงของความหนาแน่นกระแสไฟฟ้าและอัตราการลดลงของพื้นที่ผิวในการเกิดปฏิกิริยาน้อยที่สุด ทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน เนื่องจากพอลิแอนิลีนที่เติมลงไปช่วยในการยึดเกาะระหว่างตัวเร่งปฏิกิริยาและตัวรองรับ ทำให้ตัวเร่งปฏิกิริยากระจายตัวได้ดีและมีเสถียรภาพ จากผลการทดลองข้างต้น พบว่าตัวเร่งปฏิกิริยา PtIrO2/CNTs-PANI เหมาะสมสำหรับการเร่งปฏิกิริยาทั้งในปฏิกิริยารีดักชันของออกซิเจนและปฏิกิริยาการเกิดออกซิเจน เพื่อใช้เป็นตัวเร่งปฏิกิริยาแบบสองหน้าที่สำหรับเซล์เชื้อเพลิงพีอีเอ็มแบบผันกลับได้
Plugging Performance Of Preformed Particle Gels In Fractures And Its Influencing Factors,
2019
Missouri University of Science and Technology
Plugging Performance Of Preformed Particle Gels In Fractures And Its Influencing Factors, Ze Wang
Doctoral Dissertations
"Preformed particle gels (PPG) has been successfully applied to combat the water channeling caused by fractures or fracture-like channels. Understanding the placement and plugging of PPG in fractures is crucial for gel treatment design. The objective of the dissertation is to explore the plugging performance of three PPG products in two types of fracture models, the partially and fully open fractures. The following studies has been conducted and conclusions have been drawn based on the results and analysis. First, the placement and plugging performance of conventional PPG was investigated using core flooding experiments conducted partially open fractures. The plugging efficiency …
