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Articles 1 - 30 of 58
Full-Text Articles in Other Chemical Engineering
Microscopic Insights On Shear Rheology Of Polyampholyte Ionomers Via Molecular Simulations, Kyle Vonscio
Microscopic Insights On Shear Rheology Of Polyampholyte Ionomers Via Molecular Simulations, Kyle Vonscio
Williams Honors College, Honors Research Projects
Ionomers are polymers that contain a small fraction of charged groups. The ionic attraction of charged groups allows ionomers to act similarly to crosslinked polymers. Depending on the strength of electrostatic interactions and structure of the ionomers, different dynamics and rheological responses can be observed. With moderate attraction between ions, these noncovalent crosslinks can be broken when heated, allowing ionomers to flow and show the strength of a crosslinked network at low temperatures. Nonequilibrium molecular dynamics (NEMD) simulations will be performed under shear in the xy-plane and the macroscopic rheology and conformation of the polyampholyte ionomer will be determined. The …
Determining Critical Micelle Concentrations Of Standard Surfactants And Rhamnolipids, Kathryn E. Kunz
Determining Critical Micelle Concentrations Of Standard Surfactants And Rhamnolipids, Kathryn E. Kunz
Williams Honors College, Honors Research Projects
My proposed project will study the critical micelle concentration (CMC) of rhamnolipids using the pendant-drop and drop-weight methods. First, the critical micelle concentrations of ionic and nonionic common surfactants will be tested. Sodium Dodecyl Sulfate (SDS) will be used as an ionic surfactant and Tween 20 will be used as a nonionic surfactant. The critical micelle concentrations will be determined using the pendant-drop and drop-weight methods. The experimental results from the standard surfactants compared to their accepted values will be tested to assist with determining a more suitable approach. Completing the tests will provide a better understanding of critical micelle …
Effects Of Hofmeister Ions On Lower Critical Solution Temperatures Of Poly(N-Isopropylacrylamide) And Poly(Vinyl Methyl Ether), Joseph Joaquin
Effects Of Hofmeister Ions On Lower Critical Solution Temperatures Of Poly(N-Isopropylacrylamide) And Poly(Vinyl Methyl Ether), Joseph Joaquin
Williams Honors College, Honors Research Projects
The goal of this study is to compare how four different Hofmeister anions (Cl-, SCN-, F-, and I-) affect the Lower Critical Solution temperature (LCST) on two thermo-responsive polymers: poly(N-isopropylacrylamide) (pNIPAAM) and poly(vinyl methyl ether) (PVME). pNIPAAm is commonly used in the environmental applications such as monitoring, oil-water separations, or antifouling materials, and in medical industry from drug delivery to tissue engineering. When pNIPAAM or PVME reaches a temperature above their LCST, they become hydrophobic, and the polymer chains coiled, leading to their aqueous solutions turn opaque. PVME exhibits a similar LCST as that of pNIPAAM, so it can be …
Analysis Of Sessile Drop And Captive Bubble Contact Angle Measurements On Metallic And Hydrophobic Surfaces, Jack H. Darnell
Analysis Of Sessile Drop And Captive Bubble Contact Angle Measurements On Metallic And Hydrophobic Surfaces, Jack H. Darnell
Williams Honors College, Honors Research Projects
Contact angle measurements are widely used to characterize surface wettability and determine changes in surface energy, yet the choice of measurement technique can significantly influence the results. This study compares the sessile drop and captive bubble methods for measuring contact angles of sodium dodecyl sulfate (SDS) solutions on carbon steel, stainless steel, and a hydrophobic wafer. Additionally, the time‑dependent wetting behavior of water, SDS, polysorbate 20 (commercial name Tween 20), and rhamnolipids on a hydrophobic wafer was evaluated over a five‑minute period. Results show that the sessile drop method consistently produced higher contact angles than the captive bubble method on …
Effects Of Coupling Agents On An Epoxy Coating And Consequent Corrosion Resistance Of Carbon Steel, Breck A. Mooney
Effects Of Coupling Agents On An Epoxy Coating And Consequent Corrosion Resistance Of Carbon Steel, Breck A. Mooney
Williams Honors College, Honors Research Projects
This project will include the determination of how coupling agents affect corrosion resistance on select carbon steel when combined with a polymer coating. This research will explore 2 different silane coupling agents: 3-aminopropyltriethoxysilane (APTES) and 3-glycidoxypropyl-trimethoxysilane (GPTMS). 1 polymer coating, Bispenol A diglicidyl ether (BADGE), will be explored as well. These coatings will be applied to select carbon steels in various ratios to determine their effects on corrosion.
Computer-Aided Molecular Design To Identify More Environmentally Friendly Pfas, Melvin M. Keita
Computer-Aided Molecular Design To Identify More Environmentally Friendly Pfas, Melvin M. Keita
Williams Honors College, Honors Research Projects
The goal of this project is to inversely design alternatives to per- and polyfluoroalkyl substances (PFAS) using Computer-Aided Molecular Design (CAMD). PFAS, also described as “forever chemicals”, have been used in industry and consumer products since the 1940s. PFAS can be found in drinking water, food, food packaging, waste sites, and other sources. Exposure to different PFAS can lead to increased risks of some cancers, immune effects, and reproductive effects. Pulling from existing data, this project will use quantitative structure-property relationships (QSPRs) to design PFAS alternatives that possess optimal properties to prevent adsorption into drinking water and other potential sources …
Rhamnolipid As An Effective Srb Biocide – Determining A Solution To Replicate Anticipated Conditions, Elizabeth Zimmerer
Rhamnolipid As An Effective Srb Biocide – Determining A Solution To Replicate Anticipated Conditions, Elizabeth Zimmerer
Williams Honors College, Honors Research Projects
This project aimed to develop a laboratory-scale solution that replicates produced water conditions (CO2 + brine) found in crude pipelines, with the added requirement of promoting the growth of sulfate-reducing bacteria (SRB). A previously successful study was used as a reference, which employed a hybrid salt solution containing essential nutrients and environmental factors. The proposed solution included 10 g sodium chloride, 1 g sodium pyruvate, 0.2 g ammonium chloride, and 0.8 g sodium sulfate per liter of deionized water. Electrochemical testing (Linear Polarization Resistance and Electrochemical Impedance Spectroscopy) was performed on solutions with and without rhamnolipid. Results from the …
Effects Of Chain Length, Saturation, And Bases On Saponification, Sarah Fenik
Effects Of Chain Length, Saturation, And Bases On Saponification, Sarah Fenik
Williams Honors College, Honors Research Projects
This project will analyze the effects of chain length and saturation of fatty acids on saponification processes, as well as the effects of the base used in the reaction. Stearic acid, lauric acid, and oleic acid will be used for the fatty acid comparisons, and sodium hydroxide and potassium hydroxide will be used for the base comparisons. Stearic acid is considered a long chain fatty acid, while lauric acid is considered a short chain fatty acid. Oleic acid is a monounsaturated fatty acid. Five soap products are be made: sodium stearate, sodium laurate, sodium oleate, potassium stearate, and potassium oleate. …
Corrosion Of Pipes In Soil Under Cathodic Protection, Ashley Chow
Corrosion Of Pipes In Soil Under Cathodic Protection, Ashley Chow
Williams Honors College, Honors Research Projects
This research project focuses on understanding how various soil properties affect the corrosion of buried pipelines that are protected by cathodic protection (CP) systems. Specifically, the study seeks to evaluate key soil characteristics, including resistivity, moisture content, and pH levels to determine their influence on the efficiency of CP systems in mitigating corrosion. Through controlled laboratory experiments, carbon steel specimens were exposed to a range of simulated soil conditions to mimic real-world environments. Corrosion rates were assessed using advanced electrochemical techniques, such as linear polarization resistance (LPR) and Tafel slopes, along with traditional mass loss methods. The primary objectives of …
Prediction Of Glass Transition Temperature Of Polymers Using Structure-Based Models, Nicholas Wolfe
Prediction Of Glass Transition Temperature Of Polymers Using Structure-Based Models, Nicholas Wolfe
Williams Honors College, Honors Research Projects
The focus for this study is prediction of glass transition temperatures of polymers using machine learning models. The preprocessing of the data included the generation of descriptors, the scaling of the data, the principal component analysis for dimensionality reduction, and the clustering of the data. Three methods of property predictions were utilized including Linear Regression, Random Forest, and a Feedforward Neural Network. The dataset consisted of over 7000 polymers each with their respective glass transition temperatures. This study found that the Random Forest model returned the best results followed by the Feedforward Neural Network then the Linear Regression model. Each …
Qualitative Analysis Of Surface Modification On Wiffleball Aerodynamics, Cole Lanni
Qualitative Analysis Of Surface Modification On Wiffleball Aerodynamics, Cole Lanni
Williams Honors College, Honors Research Projects
This project investigated how surface modifications to a Wiffleball affect its aerodynamic behavior, particularly its vertical and horizontal movement when thrown. The study tested the hypothesis that altering surface texture through cutting or sanding would influence airflow and pressure differentials, thereby changing the ball's movement. Six ball conditions: including unmodified, sanded, and various cut patterns were tested using a pitching machine in a controlled indoor environment. Each variation was pitched ten times, and movement was analyzed through measurements of contact points on posterboards and performing statistical testing, specifically ANOVA with Post Hoc analysis. Results indicated that surface modifications significantly increased …
Urotropine As A Corrosion Inhibitor In Steel Rebar: A Molecular Dynamics Study, Tyler Zadrozny
Urotropine As A Corrosion Inhibitor In Steel Rebar: A Molecular Dynamics Study, Tyler Zadrozny
Williams Honors College, Honors Research Projects
This project investigates the behavior of corrosion in rebar, a critical component in infrastructure such as roads and skyscrapers. Corrosion of rebar can lead to structural instability, visible as cracks or pitting on the surface. The primary focus is on the potential of urotropine as a corrosion inhibitor. Urotropine, known for its ability to inhibit corrosion in mild steel in acidic environments, is hypothesized to be effective in preventing corrosion on rebar. To explore this, molecular dynamics simulations using LAMMPS were conducted, modeling urotropine molecules in an acidic solution (PH = 1) interacting with iron atoms, mimicking rebar. Simulations were …
Comsol Simulation Of Pipeline Corrosion With Cathodic Protection, Ethan Scalzo
Comsol Simulation Of Pipeline Corrosion With Cathodic Protection, Ethan Scalzo
Williams Honors College, Honors Research Projects
Cathodic protection (CP) is a widely used technique to mitigate corrosion in buried steel pipelines. This study uses COMSOL Multiphysics to model and analyze the performance of both sacrificial anode and impressed current systems in a simulated 3D environment. The model solves for pipeline potential, current density, and corrosion rate within a surrounding soil domain to assess protection coverage across the pipeline. Simulations were conducted to evaluate the influence of electrode and electrolyte properties on CP effectiveness. The study demonstrates that COMSOL Multiphysics is an effective tool for modeling CP systems, offering insights that align with established industry practices. While …
Quantifying The Effectiveness Of Rhamnolipid As A Biocide: Assessing Comparability Of A Modified Solution, Rosemary Sterling
Quantifying The Effectiveness Of Rhamnolipid As A Biocide: Assessing Comparability Of A Modified Solution, Rosemary Sterling
Williams Honors College, Honors Research Projects
The CO2 induced corrosion of carbon steel in oil and gas pipelines, exacerbated by sulfate-reducing bacteria (SRB), poses a serious threat to infrastructure. This study evaluates the effectiveness of rhamnolipid (RhL), a biosurfactant, as a corrosion inhibitor and potential SRB biocide in simulated pipeline environments. Using a Postgate-C Modified Produced Water Simulant, which demonstrated electrochemical behavior comparable to industry-standard solutions while sustaining SRB, corrosion trials were conducted with and without RhL. Mass loss and electrochemical data revealed that RhL significantly reduced corrosion rates—by 85% on average and up to 99% instantaneously in a 4-day trial. Visual and analytical results from …
Alloy Corrosion Resistance Project, Noah Gourley
Alloy Corrosion Resistance Project, Noah Gourley
Williams Honors College, Honors Research Projects
This Honors Research Project aims to determine the material performance of two metal alloys – 316L and Alloy 20CB-3 – in terms of corrosion resistance. The project will answer the following research questions: What effect do phosphoric acid and heptanoic acid solutions have on the passive film of 316L and Alloy 20CB-3 metal alloys? How do the metal alloys resist corrosion under flow conditions of the acids? What is the viability of these alloys to be used in a chemical process involving these acids?
Assessing Co2 Capture On Amine Sorbents At Low Vacuum Swing Conditions, Brock Haas, Payton Taylor
Assessing Co2 Capture On Amine Sorbents At Low Vacuum Swing Conditions, Brock Haas, Payton Taylor
Williams Honors College, Honors Research Projects
Carbon dioxide (CO2) emissions to Earth's atmosphere have increased rapidly in recent decades largely due to growing fossil fuel use in human-led activities The research contained in this proposal assesses a way to capture CO2 concentration in the atmosphere. The project studies the effectiveness of a vacuum swing adsorption (VSA) process for capture of CO2 from air. CO2 will first be adsorbed by introducing an amine sorbent to a CO2-rich environment for a predetermined period. The amine sorbent will be placed in a VSA unit that will operate at the desorption stage. The sorbent will then be sent to a …
Design Of An Experimental Solid Rocket Motor, Johnathan Bettes, Andrew Fuller
Design Of An Experimental Solid Rocket Motor, Johnathan Bettes, Andrew Fuller
Williams Honors College, Honors Research Projects
This project utilizes mechanical and chemical principles to characterize propellant grains and to manufacture a custom nozzle to create experimental Solid Rocket Motors (SRMs) with a propellant called Angry Listerine. For the propellant grains, one major non-chemical factor that determines its thrust performance is the grain geometry, or the core of the grains for which hot gases flow through the propellant and out of the nozzle to further react with exposed chemical surfaces. The two kinds of grain geometries analyzed and tested in this report are called MoonBurner, an offset circular core, and Finocyl, a gear-shaped core. The nozzle for …
Distillery, Clare Nicholas, Patrick Hanlon
Distillery, Clare Nicholas, Patrick Hanlon
Williams Honors College, Honors Research Projects
The goal for this project is to make a cost effective still. We will be implementing cost saving parts to create a cheap but effective still. From initial research conducted, we will try to combine a stainless steel still and copper still together so that the cheaper material (stainless steel) and the component that removes sulfur compounds (copper) are both implemented. The ME side of the project will focus on the actual design and construction of the parts that will be implemented into the still. Included in the design process will be calculations of heat transfer for the current and …
Utilizing Computer-Aided Molecular Design With Azido-Ester Plasticizers, Justin Ebert
Utilizing Computer-Aided Molecular Design With Azido-Ester Plasticizers, Justin Ebert
Williams Honors College, Honors Research Projects
The goal of this project was to utilize Computer-Aided Molecular Design (CAMD) using the Signature molecular descriptor to inversely design optimized azido-ester plasticizers. Azido-ester plasticizers are used to modify the mechanical properties of propellant and explosive formulations. With the assistance of quantitative structure-property relationships, QSPRs, and two types of constraint equations, these new, novel plasticizers have the potential to possess optimal physical and chemical properties. Properties investigated in this work were decomposition temperature, heat of formation, glass transition temperature, and molecular weight. These properties were chosen for their importance when formulating propellants or explosives. After the filters were applied to …
Prototype Development For Fabric Sodium Sensor, Mary Nicodemus, Dunia Jaffal, Shelby Daniels
Prototype Development For Fabric Sodium Sensor, Mary Nicodemus, Dunia Jaffal, Shelby Daniels
Williams Honors College, Honors Research Projects
This project is designed to refine a process for developing sodium-selective nylon fabric sensors to be used for reading sodium concentrations in sweat from the human body through a series of quality control and on-body testing experiments. The intention is to have a refined process to make reproducible sensors that are turned into consistently working prototypes for future mass production. There are three essential steps in developing a working prototype: sensor synthesis, sensor testing, and sensor validation. Once all three steps are completed, consistent methods will be defined for turning nylon into sensors and then into prototypes, calibrating the prototypes, …
Comparing Galvanic Corrosion Rates Predicted From Polarization Curves With Empirical Data From A Carbon Steel And Monel Couple For A Various Geometries, Michael Hinnebusch
Comparing Galvanic Corrosion Rates Predicted From Polarization Curves With Empirical Data From A Carbon Steel And Monel Couple For A Various Geometries, Michael Hinnebusch
Williams Honors College, Honors Research Projects
The objective of this investigation was to compare the galvanic corrosion rate of carbon steel C1018 and Monel K-500 alloy in a bolt and plate geometry to that derived using Tafel plots. This was achieved using carbon steels sheets of steel with a pair of with varying the number of Monel bolts and varying spacing. It was found that the carbon steel plates do not corrode uniformly. This can create issues when using Polarization curves to assume galvanic corrosion rate of a carbon steel and Monel system. The geometry of the bolts can further affect this corrosion rate and make …
Application Of Sla 3d Printing For Polymers, Taylor Wilson
Application Of Sla 3d Printing For Polymers, Taylor Wilson
Williams Honors College, Honors Research Projects
Stereolithography is a type of 3D printing that allows liquid photopolymer resin to be cured into layers that make up a 3D object. Creation of such resins for these purposes can require a significant amount of time to test and develop, and commercial resins also require some amount of testing for printer settings before use. This paper reviews how stereolithography works, the materials used, and experimentation done to compare the resin properties to the determined curing times. Using several commercially available resins, varying base exposure and layer exposure times were used to determine the lowest possible curing time that gave …
Retention And Stability Of Polystyrene Sulfonic Acid And Polyethylene Glycol Anti- Fouling Films With 3-Aminopropyltriethoxysilane Coupling Agent, Brian Cameron
Williams Honors College, Honors Research Projects
Fouling is a process where particles, proteins, or microorganisms will accumulate onto a material [2]. This can lead to biofilms in medical implants, which can trap and create drug resistant bacteria [5]. Due to this, the study and creation of anti-fouling polymeric films that is stable in aqueous environments is essential. The goal of this study is to utilize APTES to retain the already studied PSS-PEG anti-fouling films. The films that are created is a thermally crosslinked network of the polystyrene sulfonic acid (PSS) and polyethylene glycol (PEG) with differing mass fractions (75- 25 and 55-45 PSS-PEG). To retain the …
Extraction Of Melanin From Black Knot Fungus: Optimization And Applications, Amara Davis
Extraction Of Melanin From Black Knot Fungus: Optimization And Applications, Amara Davis
Williams Honors College, Honors Research Projects
The goal of this research project was to optimize the extraction of melanin from black knot fungus and to analyze possible applications of the extracted melanin. An extraction method that was previously created was examined for possible improvements. Improvements that were studied include the elimination of steps in the extraction process while obtaining the same quality of product, examining options for machinery that could be used to increase production rate when moved to a production plant setting, and optimize the concentrations of the raw materials that are used in the extraction for possible reduction of cost without compromising yield or …
Development Of Co2 Capture Method Via Polyurethane-Amine Sorbent In Vsa, Samantha Starkey, David S. Rinehart
Development Of Co2 Capture Method Via Polyurethane-Amine Sorbent In Vsa, Samantha Starkey, David S. Rinehart
Williams Honors College, Honors Research Projects
With increases in extreme weather and global temperatures, research is delving into CO2 capture to help reverse climate change. This project explored utilizing vacuum swing adsorption (VSA) for CO2 capture and release. VSA uses a sorbent, in this case amine sorbents, to capture CO2 from air and subsequently removes it via vacuum. Polyurethane (PU) foam was investigated as a potential matrix for amine sorbents to increase exposure of CO2 capturing amines to air by utilizing its porous structure. PU mixing studies were conducted to determine the feasibility of mixing PU foam with amines and coating foams …
Relating Modified Ergun's Equation To Hindered Settling Correlations, Ryan Zahniser
Relating Modified Ergun's Equation To Hindered Settling Correlations, Ryan Zahniser
Williams Honors College, Honors Research Projects
Correlations were developed between the Modified Ergun’s and Hindered settling correlations under the condition of dense packing of particles in the bed. As the porosity of the slurry increases, so does the interference between particles in the solution which mimics the behavior of a packed or densely concentrated fluidized bed. The similarity between the two sets of conditions was modeled using mathematical equations to calculate settling velocities and pressure drops by means of the Hindered Settling correlations and Modified Ergun’s equation at porosities ranging from 0.4242 to 0.89. The results showed that a porosity of 0.52 and 0.009 ft particle …
Increasing The Corrosion Protection Of Aisi 1008 Carbon Steel By Surface Treatment With Unmodified And Benzotriazole Modified Sol-Gel Films, Shane Thomas Kelliher
Increasing The Corrosion Protection Of Aisi 1008 Carbon Steel By Surface Treatment With Unmodified And Benzotriazole Modified Sol-Gel Films, Shane Thomas Kelliher
Williams Honors College, Honors Research Projects
The corrosion performance of sol-gel coated AISI 1008 carbon steel was investigated in 3.5 wt% NaCl solutions of pH 7, 9, and 12 using electrochemical measurements. A corrosion inhibitor, benzotriazole (BTA) was added to the sol-gel mixture and tested as a second, modified sol-gel coating. Sol-gel films adhered evenly to metal samples and were characterized by FTIR spectroscopy. Electrochemical Impedance Spectroscopy (EIS) showed an increase in polarization resistance from blank to sol-gel coated samples (600-18,800,000 ohms). Cyclic polarization (CPP) curves showed positive hysteresis loops for blank and unmodified sol-gel coated samples which increased at high pH following the backward potential …
Design Of Pigments For Use In “Cool” Coatings, Tyler Laughorn
Design Of Pigments For Use In “Cool” Coatings, Tyler Laughorn
Williams Honors College, Honors Research Projects
This project was focused on the development and testing of several novel pigments that exhibit high NIR-reflectance and therefore show potential for use in “cool” coatings. A “cool” coating will reflect more solar radiation than other standard coatings, and so a coated structure would require less energy to keep cool. Four sets of pigments were synthesized: Co1-xMgxCr2O4 (teal), Co0.25Mg0.75Cr2-yAlyO4 (blue), Ti1-x-yNixSbyO2 (yellow), and Cr2-xFexO3 (black). NIR and TSR values were then measured …
Filtration Apparatus Design For Oil-Water Separation Using Membranes And Sponges, Alec Jerger
Filtration Apparatus Design For Oil-Water Separation Using Membranes And Sponges, Alec Jerger
Williams Honors College, Honors Research Projects
It can be difficult to separate water and oil emulsions through traditional filtration. Therefore, investigations of filtering using thermo-responsive (TR) polymers, in this case poly(vinyl methyl ether) (PVME), was conducted. It’s hypothesized that below its lower critical solution temperature (LCST), PVME has an affinity for water while oil substances do not. Above the LCST the opposite will be true. To verify this hypothesis, iterations of filtration designs were created to provide optimum control over the parameters to measure flow. The final optimized experimental apparatus was a Chromaflex glass column which was air tight and controlled all parameters besides fluid flow. …
Testing The Effectiveness Of Reflective "Cool" Pigments, Ashleigh Carpenter
Testing The Effectiveness Of Reflective "Cool" Pigments, Ashleigh Carpenter
Williams Honors College, Honors Research Projects
This project is an exploration of reflective "cooling" pigments used in coatings for the exterior of a structure in order to control the temperature inside. The pigments reflect sunlight to reduce the heating effect inside a structure. While the project will include the synthesis and testing of these pigments, the focus will be on the design and construction of an apparatus to test the effectiveness of these pigments. An apparatus will be constructed with a heat source and two structures of identical dimensions. The set-up will allow for the temperature of the inside of the structures to be recorded at …