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Articles 1 - 14 of 14
Full-Text Articles in Other Chemical Engineering
Novel Synthesis Of Cigs Nanoparticles For Scalable, Benign Inks For Solution Processed Solar Cells, Jacob Fields, Ryan Ellis, Rakesh Agrawal
Novel Synthesis Of Cigs Nanoparticles For Scalable, Benign Inks For Solution Processed Solar Cells, Jacob Fields, Ryan Ellis, Rakesh Agrawal
The Summer Undergraduate Research Fellowship (SURF) Symposium
One potential production route to high efficiency, low cost, photovoltaics (PVs) which was explored is Copper Indium Gallium Sulfide (CIGS) nanocrystal inks for solution processed PVs. A common CIGS nanocrystal ink synthesis utilizes ligands—molecules attached to the particle surface—for colloidal stability, size control, and shape control. It is desirable to devise a novel synthesis which will incorporate a ligand that allows suspensions in more benign solvents than current methods—a desirable characteristic for large scale production. In order to develop the aforementioned synthesis of CIGS nanoparticles, an optimization study of synthesis parameters was performed. Selection of an appropriate solvent, and sulfur …
Effect Of Conveying And Distributive Mixing Elements On Breakage Phenomenon In Twin Screw Granulation, Jiayu Li, Shankali U Pradhan, Carl Wassgren
Effect Of Conveying And Distributive Mixing Elements On Breakage Phenomenon In Twin Screw Granulation, Jiayu Li, Shankali U Pradhan, Carl Wassgren
The Summer Undergraduate Research Fellowship (SURF) Symposium
Twin screw wet granulation (TSG) is gaining more attention and becoming an important process in the pharmaceutical industry. The process is widely implemented because of its flexibility, short residence time, and small equipment footprint. Past studies have shown that screw elements can have a significant impact on the performance of the TSG process. In addition, these studies identified that breakage of wet mass is a significant step in the process. Currently there is no literature that focuses on the effect of each screw element on the breakage process. In this work, experiments have been designed to isolate the breakage process …
Continuous Ligand-Assisted Elution Chromatography Applied To Separation Of Rare Earth Elements, Jeremy A. Weinstock, David M. Harvey, N.-H. Linda Wang
Continuous Ligand-Assisted Elution Chromatography Applied To Separation Of Rare Earth Elements, Jeremy A. Weinstock, David M. Harvey, N.-H. Linda Wang
The Summer Undergraduate Research Fellowship (SURF) Symposium
Rare earth elements (REEs) are metals used to make many valuable products such as magnets and electronics. Following their extraction from larger materials, REEs are to be separated into their individual components as high purity is required for product manufacture. Purification is very difficult because most (15/17) of the REEs are lanthanides (Ln’s) and Ln ions have the same valence and similar atomic radii. The current industrial process for purifying REEs involves using toxic solvents to perform a series of liquid-liquid extractions. Ling and Wang (2015) proposed a ligand-assisted batch chromatography process to purify Ln’s. The latter approach is a …
Optimal Surfactant Selection For Chemical Enhanced Oil Recovery In Low Temperature, Low Salinity, High Hardness Reservoirs, Christian D. White, Ryan A. Mulvenna, Rituraj Borgohain, Cliff Johnston, Bryan Boudouris
Optimal Surfactant Selection For Chemical Enhanced Oil Recovery In Low Temperature, Low Salinity, High Hardness Reservoirs, Christian D. White, Ryan A. Mulvenna, Rituraj Borgohain, Cliff Johnston, Bryan Boudouris
The Summer Undergraduate Research Fellowship (SURF) Symposium
Based on the environmental properties of a crude oil reservoir, only 20-30 % of oil product can be recovered using primary and secondary extraction methods. The remaining stranded oil can only be recovered via various enhanced oil recovery methods. Chemical enhanced oil recovery (EOR) uses specialty chemicals to extract trapped oil in rock layers by generating in-situ microemulsion in the presence of reservoir brine and oil. In this case study, phase behavior tests are conducted for microemulsion formation between the surfactant solution and the oil. The phase behavior tests model reservoirs with low temperature and low salinity. In order to …
Mechanical Dispersion Of A Semi-Solid Binder In A Wet Granulation Process, Justin W. Perry, James D. Litster, Nathan J. Davis
Mechanical Dispersion Of A Semi-Solid Binder In A Wet Granulation Process, Justin W. Perry, James D. Litster, Nathan J. Davis
The Summer Undergraduate Research Fellowship (SURF) Symposium
High viscosity surfactant pastes have recently gained popularity in the production of high efficiency laundry detergents due to their ability to increase surfactant loading in granules. When using high viscosity semi-solid binders a unique challenge is presented because it forces granules to be formed primarily by mechanical dispersion; a relatively poorly understood process. Developing mechanistic models of this process will enhance knowledge of mechanical dispersion processes and improve process development for granules produced using this method. Experiments to determine the effect of three process parameters; paste temperature, impeller RPM, and time were carried out in a lab-scale granulator. Binder temperature …
Dissolution Of Chalcogens In Amine Thiol Solvents For Use In Nanoparticles, Gaurav A. Mittal, Caleb K. Miskin, Rakesh Agrawal
Dissolution Of Chalcogens In Amine Thiol Solvents For Use In Nanoparticles, Gaurav A. Mittal, Caleb K. Miskin, Rakesh Agrawal
The Summer Undergraduate Research Fellowship (SURF) Symposium
Lead chalcogenide quantum dots have been shown to be ideal materials for solar cells due to their tunable band gap. Developing a dissolution procedure for chalcogens will help lower the production cost of the solar cells produced by the associated nanoparticles. Dissolution was performed in both aqueous and nonaqueous solutions. Precursors for sulfur and selnium were dissolved in both the aqueous solution of ammonium thioglycolate and ammonium hydroxide and in combinations of amines and thiols. Precursors for tellurium were dissolved in ethylenediamine and different thiols. Lead telluride forms larger microparticles that can be suitable for thermoelectric devices. The optimum solutions …
Processing Methods And Storage Conditions On Chocolate And Coffee Powder Flow Properties, Sunland L. Gong, Andrea Della Bella, Teresa M. Carvajal
Processing Methods And Storage Conditions On Chocolate And Coffee Powder Flow Properties, Sunland L. Gong, Andrea Della Bella, Teresa M. Carvajal
The Summer Undergraduate Research Fellowship (SURF) Symposium
Powders are widely used in a countless number of industries, and are crucial to the quality control of products in areas such as pharmaceuticals and food. Particle physicochemical properties (morphology, solid state – crystalline, amorphous or both) are important factors for powder flow, which in turn can have significant impact on the stability, performance, and presentation of powders. Different processing methods as well as storage conditions such as relative humidity (RH) can drastically affect powder flow. Due to the widespread use of chocolate and coffee powder around the world, and their importance to the food industry, this work investigates two …
Carbon Dioxide Sequestration To Form Calcium Carbonate Nanoparticles, Krista E. Stump, Michael T. Harris
Carbon Dioxide Sequestration To Form Calcium Carbonate Nanoparticles, Krista E. Stump, Michael T. Harris
The Summer Undergraduate Research Fellowship (SURF) Symposium
The emission of carbon dioxide caused by burning fossil fuels is one of the leading sources of global warming. Reducing the amount of CO2 released into the atmosphere through carbon sequestration can mitigate this problem. One method of carbon sequestration is the use of a carbon dioxide scrubber. Once captured, CO2 can be used to create a valuable chemical commodity such as calcium carbonate nanoparticles. To create CaCO3 particles in the 50-100 nanometer range, a chemical additive is necessary to limit particle size. The study used a laboratory scale carbon dioxide scrubber to react CO2 with …
Molecular Precursors In Aqueous Solution For Cigse Solar Cells, Bethany L. Mcilrath, Rakesh Agrawal, Mark J. Koeper
Molecular Precursors In Aqueous Solution For Cigse Solar Cells, Bethany L. Mcilrath, Rakesh Agrawal, Mark J. Koeper
The Summer Undergraduate Research Fellowship (SURF) Symposium
Thin film solar cells are one of the most promising alternatives to traditional silicon based solar cells. Copper, indium, gallium, and sufur/selenium (CIGS) act as the absorber layer in one type of thin films. CIGS films are preferable to silicon because they can have wider applications, such as flexible solar cells. The highest efficiency CIGS solar cells have been made using either expensive vacuum equipment or highly toxic chemicals. This study investigates non-toxic molecular precursor solutions deposited by spray coating. Stoichiometric amounts of CIGS are dissolved in ammonium thioglycolate and ammonium hydroxide to create the molecular precursor solution. This solution …
Synthesis And Thermoelectric Properties Of Cusbs2, Tianyue Gao, Haiyu Fang, Yue Wu
Synthesis And Thermoelectric Properties Of Cusbs2, Tianyue Gao, Haiyu Fang, Yue Wu
The Summer Undergraduate Research Fellowship (SURF) Symposium
Copper antimony sulfide, CuSbS2 nanoparticles have a large potential of being a good thermoelectric material because they are made up of earth abundant elements. Thermoelectric materials can convert thermal energy into electricity, so that the wasted energy can be saved. Also, by using this earth abundant material, we can make thermoelectric materials much cheaper. The hypothesis of this study is that CuSbS2 could have a large Seebeck coefficient, one of the most important factors of thermoelectric materials, because of the complexity of its band structure. The other hypothesis is that thermal transport could be significantly suppressed through nanostructuring. There are …
The Kinetics Of A Palladium Precursor – Tobacco Mosaic Virus Reaction, Adi Banerjee, Mayo Adigun, Michael T. Harris
The Kinetics Of A Palladium Precursor – Tobacco Mosaic Virus Reaction, Adi Banerjee, Mayo Adigun, Michael T. Harris
The Summer Undergraduate Research Fellowship (SURF) Symposium
There have been numerous developments in the field of production of metallic nanoparticles using biotemplates such as the Tobacco Mosaic Virus (TMV). Past research has looked at the conditions required to maximise nanoparticle formation. This study of the kinetics of a nanomaterial synthesis reaction using a biotemplate would elucidate the understanding of the controlled growth of nanoparticles, which can be applied in the fabrication of photocatalysts, electrical nanocircuits and solar cells. This study specifically focuses on the reaction between a palladium precursor and the TMV without an external reducing agent, where the palladium ion concentration is measured over time using …
Effect Of Twin Screw Granulator Process Parameters On Granule Attributes, Haosheng Xu, Ridade Sayin, James Litster
Effect Of Twin Screw Granulator Process Parameters On Granule Attributes, Haosheng Xu, Ridade Sayin, James Litster
The Summer Undergraduate Research Fellowship (SURF) Symposium
Twin screw wet granulation has been considered as an efficient and effective technique of manufacturing granules (agglomerates made up of small particles) and has been widely applied in pharmaceutical industry. However, narrow granule size distributions are difficult to achieve. This study aims to elucidate the effect of process parameters such as liquid feed rate and screw configuration on the granule attributes through granule characterization. The methods used are sieve analysis (for size distribution), liquid distribution (determining the dye concentration in the granules) and density and porosity (percentage gas volume in the granule) analyses. A sieve shaker is used to divide …
The Use Of Near Infrared And Microwave Sensing For On-Line Real Time Monitoring Of Moisture Content And Composition Of Powder Blend, Ryan V. Mcdonnell, Anshu Gupta, John Austin, Michael T. Harris, Gintaras V. Reklaitis
The Use Of Near Infrared And Microwave Sensing For On-Line Real Time Monitoring Of Moisture Content And Composition Of Powder Blend, Ryan V. Mcdonnell, Anshu Gupta, John Austin, Michael T. Harris, Gintaras V. Reklaitis
The Summer Undergraduate Research Fellowship (SURF) Symposium
Online process analytics has been a topic of interest by pharmaceutical companies as a method of determining how operating parameters affect the final quality of their products. One form of online process analytics that has been found to be effective is microwave sensing. While it has been found that microwave resonance sensing can be used to measure parameters such as moisture content and density, it has yet to be discovered if such sensors have the ability to measure changes in content uniformity of raw materials pharmaceutical companies use. Data was collected using a spin riffler fitted with a microwave sensor …
Tobacco Mosaic Virus Implemented As An Interfacial Layer In Organic Photovoltaic Cells, Monica D. Del Real, Bryan Boudouris
Tobacco Mosaic Virus Implemented As An Interfacial Layer In Organic Photovoltaic Cells, Monica D. Del Real, Bryan Boudouris
The Summer Undergraduate Research Fellowship (SURF) Symposium
Organic photovoltaics (OPVs) are flexible, light weight, and economical to produce due to low processing temperatures, solution processing, and print fabrication. This makes them optimal for a wide range of applications. However, the efficiencies of OPVs are currently not high enough for them to be viable in the market or to be able to compete with inorganic photovoltaics. Therefore the integration of new materials and methods into OPVs in order to increase their efficiency is a vital field. One way to increase the efficiency of OPVs is to increase the surface area in-between layers to allow for enhanced electron transport. …