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The possibility of creating inorganic/organic hybrid materials has yet to be fully explored within geopolymer research. Using PDMS as an organic precursor, the surface of sodium and potassium geopolymers of varying precursor composition were functionalized with degraded PDMS oligomers. Both types of geopolymer yielded hydrophobic materials with BET surface

The possibility of creating inorganic/organic hybrid materials has yet to be fully explored within geopolymer research. Using PDMS as an organic precursor, the surface of sodium and potassium geopolymers of varying precursor composition were functionalized with degraded PDMS oligomers. Both types of geopolymer yielded hydrophobic materials with BET surface area of 0.6475 m2/g and 4.342 m2/g for sodium and potassium geopolymer, respectively. Each respective material also had an oil capacity of 74.75 ± 4.06 weight% and 134.19 ± 4.89 weight%. X-ray diffraction analysis demonstrated that the PDMS functionalized sodium geopolymers had similar crystal structures that matched references for zeolite A and sodalite. The potassium geopolymers were amorphous, but showed consistency in diffraction patterns across different compositions.
ContributorsMaurer, Matthew (Author) / Seo, Don (Thesis director) / Ciota, David (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2022-05
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Flavonoids are important biomolecules with a variety of pharmaceutical and agricultural applications. Currently, isolating these compounds is done by plant extraction, however this process is hindered by large land and energy requirements. Previous groups have aimed to overcome these challenges by engineering microbes to produce these important compounds, however this

Flavonoids are important biomolecules with a variety of pharmaceutical and agricultural applications. Currently, isolating these compounds is done by plant extraction, however this process is hindered by large land and energy requirements. Previous groups have aimed to overcome these challenges by engineering microbes to produce these important compounds, however this is largely bottlenecked by the lack of intercellular malonyl-CoA availability. To remedy this, the genes matB and matC have been identified as coding for malonyl-CoA synthase and a putative dicarboxylate carrier protein, respectively. Other works have successfully engineered two variants, Streptomyces coelicolor and Rhizobium trifolii, of these genes into Escherichia coli, however this has yet to be accomplished in Gram-positive Corynebacterium glutamicum. Additionally, other groups have neglected to attempt tuning these genes with respect to one another by inserting in front of different inducible promoters. This study has successfully assembled two plasmids containing the Streptomyces coelicolor and Rhizobium trifolii variants of both matB and matC. Preliminary fermentations and GCMS results confirmed that little to none naringenin was produced without the matB-matC module. Additionally, preliminary fermentations revealed that the DelAro1 and DelAro3 strains can be used to reduce metabolism of aromatics like naringenin.

ContributorsRonstadt, Jason (Author) / Varman, Arul (Thesis director) / Nielsen, David (Committee member) / Liu, Fang (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2022-05
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Description
Upon cooling a semicrystalline polymer from its amorphous melt state, it undergoes melt crystallization where organized microstructures develop through a process of nucleation and crystal growth. Understanding the crystallization kinetics of a semicrystalline thermoplastic is key to tuning crystallinity and microstructure, which play integral roles in the material’s final properties

Upon cooling a semicrystalline polymer from its amorphous melt state, it undergoes melt crystallization where organized microstructures develop through a process of nucleation and crystal growth. Understanding the crystallization kinetics of a semicrystalline thermoplastic is key to tuning crystallinity and microstructure, which play integral roles in the material’s final properties such as toughness, gas permeability, and degradation rate. Nonisothermal crystallization, in particular, has great technological relevance to polymer engineering processes such as injection molding, film blowing, and fiber spinning, all of which rely on fast cooling rates. Spectroscopic, scattering, calorimetric, and rheological techniques have been conventionally used for studying nonisothermal crystallization, but can be limited in their sensitivity, tunability, and availability. Our group has recently developed a fluorescence technique for sensing the melting transitions of semicrystalline thermoplastics by incorporating fluorescent probes into polymer matrices. Herein, this methodology has been extended to an in-situ study of nonisothermal melt crystallization by monitoring the T-dependent fluorescence intensity of the fluorophores incorporated into a polymer matrix. As crystals form upon cooling from the amorphous melt state, the intramolecular motions of fluorophores are restricted and thus their T-dependent fluorescence intensity data exhibit a stepwise increase during nonisothermal crystallization. The first derivative of the T-dependent fluorescence intensity data can provide insight into the onset, peak, and endset crystallization temperatures, all of which align reasonably well with conventional differential scanning calorimetry measurements. This facile, sensitive, and contact-free fluorescence technique can access faster cooling rates (up to ~100 oC min-1) than many other existing methods for nonisothermal crystallization studies, which is more relevant to industrial polymer processing conditions. Additionally, the fluorescence detection mechanism shows great sensitivity not only to the degree of crystallinity but also to the crystalline microstructure formed during nonisothermal crystallization. Furthermore, unique fluorescent labeling is expected to foster novel studies on the local crystallization within heterogeneous polymeric systems including blends, composites, and multilayer films. Such local crystallization studies are out of reach for most conventional techniques that measure spatially averaged properties. Overall, this nonisothermal crystallization study expands the capabilities of this novel fluorescence technique for advancing the field of semicrystalline thermoplastic design and processing.
ContributorsCabello, Maya (Author) / Jin, Kailong (Thesis director) / Nile, Gabriel (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2022-05
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Description

Utilizing DFT calculations, various substitutions on the AlPO-5 zeolite were screened for adsorption of common air molecules. Furthermore, free energy analyses using the Helmholtz free energy equation were performed to determine candidates for selective adsorption of one specific air molecule, and their operating temperature range. Through this study, it was

Utilizing DFT calculations, various substitutions on the AlPO-5 zeolite were screened for adsorption of common air molecules. Furthermore, free energy analyses using the Helmholtz free energy equation were performed to determine candidates for selective adsorption of one specific air molecule, and their operating temperature range. Through this study, it was found that Cerium- (92-542 K), Germanium- (69-370 K), Chromium- (35-293 K), and Praseodymium- (0-420 K) substituted AlPO-5 selectively adsorbs to O2 molecules for the given temperature ranges. In addition, Palladium-substituted AlPO-5 selectively adsorbs to CO within 430-755 K.

ContributorsIrudaya Pious Suresh, Enosh (Author) / Muhich, Christopher (Thesis director) / Emady, Heather (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2022-05
Description

In this project, we will argue that the Kardashian women influence beauty standards by portraying themselves as beauty moguls to control the interests of their audience and promoting themselves as the modern day standard of beauty. This affects their audience by creating unattainable and unrealistic standards of beauty that negatively

In this project, we will argue that the Kardashian women influence beauty standards by portraying themselves as beauty moguls to control the interests of their audience and promoting themselves as the modern day standard of beauty. This affects their audience by creating unattainable and unrealistic standards of beauty that negatively impacts their sense of self and mental health. We will explore the influence they have created and why their influence remains preferred by their audience over time, explaining how they maintain control of the industry.

ContributorsEhly, Taylor (Author) / Montoya, Emily (Co-author) / Fontinha de Alcantara, Christiane (Thesis director) / Saba, Cassandra (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2023-05
Description

In this project, we will argue that the Kardashian women influence beauty standards by portraying themselves as beauty moguls to control the interests of their audience and promoting themselves as the modern day standard of beauty. This affects their audience by creating unattainable and unrealistic standards of beauty that negatively

In this project, we will argue that the Kardashian women influence beauty standards by portraying themselves as beauty moguls to control the interests of their audience and promoting themselves as the modern day standard of beauty. This affects their audience by creating unattainable and unrealistic standards of beauty that negatively impacts their sense of self and mental health. We will explore the influence they have created and why their influence remains preferred by their audience over time, explaining how they maintain control of the industry.

ContributorsMontoya, Emily (Author) / Ehly, Taylor (Co-author) / Fontinha de Alcantara, Christiane (Thesis director) / Saba, Cassandra (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2023-05
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Description

Metal oxides are crucial materials that can be applied to sustainable processes for heat storage or oxygen pumping. In order to be able to apply metal oxides to industrial processes, an effective model of the metal oxide’s reduction thermodynamics is required. To do this, Wilson et al., (2023) developed a

Metal oxides are crucial materials that can be applied to sustainable processes for heat storage or oxygen pumping. In order to be able to apply metal oxides to industrial processes, an effective model of the metal oxide’s reduction thermodynamics is required. To do this, Wilson et al., (2023) developed a compound energy formulism (CEF) algorithm to form these models. The algorithm in its current form can effectively form model thermodynamics; however, the data set required for this model is extensive and large, leading to high costs of modeling a metal oxide. Furthermore, the algorithm faces further difficulties with uneven data densities within the set, leading to poorer fits for low density data. To assist in alleviating the cost associated with data collection, data-omitting strategies were performed to find unimportant points, or points that formed models that had good fits to the original model when removed. After conducting these tests, many points and trends were found to be crucial to keep within the data set, but due to uneven data density, no definitive conclusions could be made on how to reduce the algorithm’s data set. The tests gave evidence that points in high data density regions could be removed from the data set due to only the fact that there existed nearby points to provide essential information to closely interpolate/extrapolate the missing data. Although this project currently did not meet the goal of reducing the data set, preliminary findings of what points could be non-crucial to the data set were identified. Future testing with the proposed weighting methods will be conducted to determine what data can be safely removed from the set to form models that properly reflect the metal oxide’s properties.

ContributorsDeshpande, Amogh (Author) / Muhich, Christopher (Thesis director) / Rivera, Daniel (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2023-05
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Description
This Master's thesis presents an experimental testing program conducted to assess the properties of coarse tailings from two Arizona copper mine heap leach pads. This testing program was motivated by recent failures in tailings impoundments, which has prompted a re-evaluation of tailings deposit stability worldwide. The testing was conducted using

This Master's thesis presents an experimental testing program conducted to assess the properties of coarse tailings from two Arizona copper mine heap leach pads. This testing program was motivated by recent failures in tailings impoundments, which has prompted a re-evaluation of tailings deposit stability worldwide. The testing was conducted using a unique large-scale Direct-Simple Shear (LDSS) device at Arizona State University (ASU). Prior to testing the tailings, the LDSS device had to be rehabilitated, as it had not been used for several years. The testing program included one-dimensional compression testing, shear wave velocity measurement, and monotonic shearing under constant volume conditions. The test results demonstrate the effectiveness of the LDSS device in obtaining representative data for tailings under monotonic loading. Recommendations for future improvements of the LDSS include enhancing the connection of monitoring instruments, utilizing more sophisticated software for shear wave velocity measurements, and optimizing the control system. The thesis contributes to geotechnical engineering by improving understanding and evaluation of tailings properties, thereby enhancing safety and environmental sustainability in the mining industry.
ContributorsHarker, Jack Michael (Author) / Kavazanjian, Edward (Thesis advisor) / Zapata, Claudia (Committee member) / Razmi, Jafar (Committee member) / Arizona State University (Publisher)
Created2023
Description

The purpose of this thesis was to understand the importance of supply chain visibility (SCV) and to provide an analysis of the technology available for achieving SCV. Historical events where companies lacked efficient SCV were assessed to understand how errors in the supply chain can have detrimental effects on a

The purpose of this thesis was to understand the importance of supply chain visibility (SCV) and to provide an analysis of the technology available for achieving SCV. Historical events where companies lacked efficient SCV were assessed to understand how errors in the supply chain can have detrimental effects on a company and their reputation. Environmental, social, and governance standards within the supply chain were defined along with the importance of meeting the legal and consumer expectations of a supply chain. There are many different organizations dedicated to helping companies meet ESG standards to achieve ethical, sustainable supply chains. Examples such as the Responsible Business Association and the Organization for Economic Co-Operation and Development were considered. A government solution to SCV, called the Freight Logistics Optimization Works Initiative, considered the importance of data sharing for large companies with complex supply chains, and this solution was assessed for understanding. Current companies and technologies available to achieve SCV were examined for understanding as to how the issue of SCV is currently addressed in the industry. A case study on the company Moses Lake Industries looked at how their complicated chemical manufacturing supply chain has adapted to achieve SCV. This included understanding supplier location, manufacturing processes, and risks. Future technologies that are currently being developed which could further benefit the supply chain industry were considered. Other future considerations, such as the movement of manufacturing out of high risk areas and the need for centralization of SCV solution, were also discussed.

ContributorsWhite, Lily (Author) / Bronowitz, Jason (Thesis director) / Grumbach, Elizabeth (Committee member) / Barrett, The Honors College (Contributor) / Department of Supply Chain Management (Contributor) / Chemical Engineering Program (Contributor)
Created2023-05
Description
This honors thesis report aims to propose a sustainable long-term solution for providing off-grid solar energy to rural communities that lack the necessary grid energy infrastructure. With this in mind, we aim to establish the framework and documentation for people to be able to build and maintain their own off-grid

This honors thesis report aims to propose a sustainable long-term solution for providing off-grid solar energy to rural communities that lack the necessary grid energy infrastructure. With this in mind, we aim to establish the framework and documentation for people to be able to build and maintain their own off-grid solar power systems. Due to recent pushes for clean energy both nationwide and statewide, the team will discuss the current renewable energy market and the incentives to justify the future growth potential of residential solar energy systems, which includes off-grid or remote solar. This discussion will include comparing pre-built solar systems currently offered for purchase against the proposed design outlined in this report. Notably, the outlined design has been made with an emphasis on system sustainability, low initial cost, reliability, ease of manufacturing/maintenance, and material selection. Lastly, the team will discuss the project’s approach to documentation with a user manual draft to ensure the system's long-term sustainability and troubleshooting. Although the efforts of this project have increased over time, this project remains active within the ASU EWB chapter, meaning that not all aspects described throughout this report are fully complete. The Native American community of Shonto, Arizona, will be used as an example to understand a rural community's needs for designing a solar panel system that provides sufficient energy for a single household. The project was completed in collaboration with Arizona State University’s Engineering Projects In Community Service (EPICS) program and Engineers Without Borders (EWB) chapter. Both these organizations aim to connect ASU students to the professional mentors and resources they need to design and implement low-cost, small-scale, easily replicated, and sustainable engineering projects.
ContributorsHaq, Emmen (Author) / Sosa, Jorge (Co-author) / Beltran, Salvador (Thesis director) / Pham, Brandon (Committee member) / Barrett, The Honors College (Contributor) / Chemical Engineering Program (Contributor)
Created2024-05