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2019

Chemical Engineering

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Articles 1 - 30 of 232

Full-Text Articles in Engineering

Salt Mediated Self-Assembly Of Poly(Ethylene Glycol)-Functionalized Gold Nanorods, Hyeong Jin Kim, Wenjie Wang, Wei Bu, Md. Mir Hossen, Alejandra Londono-Calderon, Andrew C. Hillier, Tanya Prozorov, Surya Mallapragada, David Vaknin Dec 2019

Salt Mediated Self-Assembly Of Poly(Ethylene Glycol)-Functionalized Gold Nanorods, Hyeong Jin Kim, Wenjie Wang, Wei Bu, Md. Mir Hossen, Alejandra Londono-Calderon, Andrew C. Hillier, Tanya Prozorov, Surya Mallapragada, David Vaknin

Chemical and Biological Engineering Publications

Although challenging, assembling and orienting non-spherical nanomaterials into two- and three-dimensional (2D and 3D) ordered arrays can facilitate versatile collective properties by virtue of their shape-dependent properties that cannot be realized with their spherical counterparts. Here, we report on the self-assembly of gold nanorods (AuNRs) into 2D films at the vapor/liquid interface facilitated by grafting them with poly(ethylene glycol) (PEG). Using surface sensitive synchrotron grazing incidence small angle X-ray scattering (GISAXS) and specular X-ray reflectivity (XRR), we show that PEG-AuNRs in aqueous suspensions migrate to the vapor/liquid interface in the presence of salt, forming a uniform monolayer ...


Identification Of An Ags2 Complex On Ag(110), Peter M. Spurgeon, Da-Jiang Liu, Junepyo Oh, Yousoo Kim, Patricia A. Thiel Dec 2019

Identification Of An Ags2 Complex On Ag(110), Peter M. Spurgeon, Da-Jiang Liu, Junepyo Oh, Yousoo Kim, Patricia A. Thiel

Chemistry Publications

Adsorbed sulfur has been investigated on the Ag(110) surface at two different coverages, 0.02 and 0.25 monolayers. At the lower coverage, only sulfur adatoms are present. At the higher coverage, there are additional bright features which we identify as linear, independent AgS2 complexes. This identification is based upon density functional theory (DFT) and its comparison with experimental observations including bias dependence and separation between complexes. DFT also predicts the absence of AgS2 complexes at low coverage, and the development of AgS2 complexes around a coverage of 0.25 monolayers of sulfur, as is experimentally observed. To our ...


Synthesis And Characterization Of Rapidly-Degrading Polyanhydrides As Vaccine Adjuvants, Sean M. Kelly, Akash Mitra, Srishti Mathur, Balaji Narasimhan Dec 2019

Synthesis And Characterization Of Rapidly-Degrading Polyanhydrides As Vaccine Adjuvants, Sean M. Kelly, Akash Mitra, Srishti Mathur, Balaji Narasimhan

Chemical and Biological Engineering Publications

There is a currently a need to develop adjuvants that are best suited to simultaneously enhance immune responses, induce immunologic memory, improve patient compliance (i.e., reduce doses and inflammation), and provide vaccine shelf stability for stockpiling and global deployment to challenging environments. Biodegradable polyanhydrides have been investigated extensively to overcome such challenges. It has been shown that controlling copolymer composition can result in chemistry-dependent immunomodulatory capabilities. These studies have revealed that copolymers rich in sebacic acid (SA) are highly internalized by antigen presenting cells and confer improved shelf stability of encapsulated proteins, while copolymers rich in 1,8-bis(p-carboxyphenoxy ...


Low Temperature Liquid Metal Batteries For Energy Storage Applications, Cameron A. Lippert, Kunlei Liu, James Landon, Susan A. Odom, Nicolas E. Holubowitch Dec 2019

Low Temperature Liquid Metal Batteries For Energy Storage Applications, Cameron A. Lippert, Kunlei Liu, James Landon, Susan A. Odom, Nicolas E. Holubowitch

Center for Applied Energy Research Faculty Patents

The present invention relates to a molten metal battery of liquid bismuth and liquid tin electrodes and a eutectic electrolyte. The electrodes may be coaxial and coplanar. The eutectic electrolyte may be in contact with a surface of each electrode. The eutectic electrolyte may comprise ZnC12:KCI.


Fluorinated Coal Derived Carbons And Electrodes For Use In Battery Systems And Similar, Stephen M. Lipka, Christopher R. Swartz Dec 2019

Fluorinated Coal Derived Carbons And Electrodes For Use In Battery Systems And Similar, Stephen M. Lipka, Christopher R. Swartz

Center for Applied Energy Research Faculty Patents

An electrode including fluorinated and surface defluorinated coal is described, as well as methods of producing such and employing such within an electrical system. The coal in the electrodes is fluorinated at an amount of between 0.3 and 1 .4. The resulting coal products can be further surface defluorinated and maintain functionality within an electrical system.


Structure-Performance Correlations Of Cross-Linked Boronic Acid Polymers As Adsorbents For Recovery Of Fructose From Glucose–Fructose Mixtures, Guido Schroer, Jeff Deischter, Tobias Zensen, Jan Kraus, Ann-Christin Pöppler, Long Qi, Susannah Scott, Irina Delidovicha Dec 2019

Structure-Performance Correlations Of Cross-Linked Boronic Acid Polymers As Adsorbents For Recovery Of Fructose From Glucose–Fructose Mixtures, Guido Schroer, Jeff Deischter, Tobias Zensen, Jan Kraus, Ann-Christin Pöppler, Long Qi, Susannah Scott, Irina Delidovicha

Ames Laboratory Accepted Manuscripts

Recovery of bio-oxygenates from reaction mixtures is one of the major challenges for future bio-refineries. Isolation of fructose produced by isomerization of glucose presents a typical example at a very early stage of the value chain. We propose to recover fructose from a solution containing a mixture of glucose and fructose by adsorption on polymers bearing phenylboronate moieties. p-Vinylphenylboronic acid was polymerized with various cross-linkers, namely polar aliphatic, low-polarity aliphatic, and aromatic. The cross-linker content was in the range 5–40 mol%. The polymers exhibit high capacities for fructose, with a maximum loading of up to 1 molFru molB ...


Common Secondary And Tertiary Structural Features Of Aptamer–Ligand Interaction Shared By Rna Aptamers With Different Primary Sequences, Muslum Ilgu, Shuting Yan, Ryan M. Khounlo, Monica H. Lamm, Marit Nilsen-Hamilton Dec 2019

Common Secondary And Tertiary Structural Features Of Aptamer–Ligand Interaction Shared By Rna Aptamers With Different Primary Sequences, Muslum Ilgu, Shuting Yan, Ryan M. Khounlo, Monica H. Lamm, Marit Nilsen-Hamilton

Chemical and Biological Engineering Publications

Aptamer selection can yield many oligonucleotides with different sequences and affinities for the target molecule. Here, we have combined computational and experimental approaches to understand if aptamers with different sequences but the same molecular target share structural and dynamical features. NEO1A, with a known NMR-solved structure, displays a flexible loop that interacts differently with individual aminoglycosides, its ligand affinities and specificities are responsive to ionic strength, and it possesses an adenosine in the loop that is critical for high-affinity ligand binding. NEO2A was obtained from the same selection and, although they are only 43% identical in overall sequence, NEO1A and ...


Zirconia-Based Compositions For Use In Passive NoX Adsorber Devices, Deborah Jayne Harris, David Alastair Scapens, John G. Darab, Mark Crocker, Yaying Ji Dec 2019

Zirconia-Based Compositions For Use In Passive NoX Adsorber Devices, Deborah Jayne Harris, David Alastair Scapens, John G. Darab, Mark Crocker, Yaying Ji

Chemistry Faculty Patents

A passive NOx adsorbent includes: palladium, platinum or a mixture thereof and a mixed or composite oxide including the following elements in percentage by weight, expressed in terms of oxide: 10-90% by weight zirconium and 0.1-50% by weight of least one of the following: a transition metal or a lanthanide series element other than Ce.

Although the passive NOx adsorbent can include Ce in an amount ranging from 0.1 to 20% by weight expressed in terms of oxide, advantages are obtained particularly in the case of low-Ce or a substantially Ce-free passive NOx adsorbent.


Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles As An Efficient Nanocomposite For Catalysis Applications In Cross-Coupling Reactions, Hany A. Elazab, Tamer T. El-Idreesy Dec 2019

Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles As An Efficient Nanocomposite For Catalysis Applications In Cross-Coupling Reactions, Hany A. Elazab, Tamer T. El-Idreesy

Chemical Engineering

This paper reported a scientific approach adopting microwave-assisted synthesis as a synthetic route for preparing highly active palladium nanoparticles stabilized by polyvinylpyrrolidone (Pd/PVP) and supported on reduced Gra-phene oxide (rGO) as a highly active catalyst used for Suzuki, Heck, and Sonogashira cross coupling reactions with remarkable turnover number (6500) and turnover frequency of 78000 h-1. Pd/PVP nanoparticles supported on re-duced Graphene oxide nanosheets (Pd-PVP/rGO) showed an outstanding performance through high catalytic activ-ity towards cross coupling reactions. A simple, reproducible, and reliable method was used to prepare this efficient catalyst using microwave irradiation synthetic conditions. The synthesis approach ...


Cdse Quantum Dots Synthesis Laboratory Course For High School Students, Danlin Zuo, Gyuseok Kim, David Jones Dec 2019

Cdse Quantum Dots Synthesis Laboratory Course For High School Students, Danlin Zuo, Gyuseok Kim, David Jones

Protocols and Reports

Cadmium selenide quantum dot is a fascinating subject for leading high school students to the quantum world. An 8-hour laboratory course for up to 12 high school students is proposed. The 8-hour course consist of two 4-hours sections. This laboratory course includes the quantum dot syntheses, absorption and emission characterization, and data analysis. The proposes process runs at relatively lower temperature which means safe and easy, and shows apparent experimental results.


Proactive Energy Optimization In Residential Buildings With Weather And Market Forecasts, Cody Simmons, Joshua Arment, Kody M. Powell, John Hedengren Dec 2019

Proactive Energy Optimization In Residential Buildings With Weather And Market Forecasts, Cody Simmons, Joshua Arment, Kody M. Powell, John Hedengren

Faculty Publications

This work explores the development of a home energy management system (HEMS) that uses weather and market forecasts to optimize the usage of home appliances and to manage battery usage and solar power production. A Moving Horizon Estimation (MHE) application is used to find the unknown home model parameters. These parameters are then updated in a Model Predictive Controller (MPC) which optimizes and balances competing comfort and economic objectives. Combining MHE and MPC applications alleviates model complexity commonly seen in HEMS by using a lumped parameter model that is adapted to fit a high-fidelity model. Heating, ventilation, and air conditioning ...


Bicontinuous Interfacially Jammed Emulsion Gels (Bijels) As Media For Enabling Enzymatic Reactive Separation Of A Highly Water Insoluble Substrate, Sanghak Cha, Hyun Lim, Martin Haase, Kathleen Stebe, Gyoo Jung, Daeyeon Lee Dec 2019

Bicontinuous Interfacially Jammed Emulsion Gels (Bijels) As Media For Enabling Enzymatic Reactive Separation Of A Highly Water Insoluble Substrate, Sanghak Cha, Hyun Lim, Martin Haase, Kathleen Stebe, Gyoo Jung, Daeyeon Lee

Henry M. Rowan College of Engineering Faculty Scholarship

Although enzymes are efficient catalysts capable of converting various substrates into desired products with high specificity under mild conditions, their effectiveness as catalysts is substantially reduced when substrates are poorly water-soluble. In this study, to expedite the enzymatic conversion of a hydrophobic substrate, we use a bicontinuous interfacially jammed emulsion gel (bijel) which provides large interfacial area between two immiscible liquids: oil and water. Using lipase-catalyzed hydrolysis of tributyrin as a model reaction in a batch mode, we show that bijels can be used as media to enable enzymatic reaction. The bijel system gives a four-fold increase in the initial ...


Polyball: A New Adsorbent For The Efficient Removal Of Endotoxin From Biopharmaceuticals, Sidharth Razdan, Jee-Ching Wang, Sutapa Barua Dec 2019

Polyball: A New Adsorbent For The Efficient Removal Of Endotoxin From Biopharmaceuticals, Sidharth Razdan, Jee-Ching Wang, Sutapa Barua

Chemical and Biochemical Engineering Faculty Research & Creative Works

The presence of endotoxin, also known as lipopolysaccharides (LPS), as a side product appears to be a major drawback for the production of certain biomolecules that are essential for research, pharmaceutical, and industrial applications. In the biotechnology industry, gram-negative bacteria (e.g., Escherichia coli ) are widely used to produce recombinant products such as proteins, plasmid DNAs and vaccines. These products are contaminated with LPS, which may cause side effects when administered to animals or humans. Purification of LPS often suffers from product loss. For this reason, special attention must be paid when purifying proteins aiming a product as free as ...


Application Of Artificial Neural Networks In The Drilling Processes: Can Equivalent Circulation Density Be Estimated Prior To Drilling?, Husam Hasan Alkinani, Abo Taleb Al-Hameedi, Shari Dunn-Norman, David Lian Dec 2019

Application Of Artificial Neural Networks In The Drilling Processes: Can Equivalent Circulation Density Be Estimated Prior To Drilling?, Husam Hasan Alkinani, Abo Taleb Al-Hameedi, Shari Dunn-Norman, David Lian

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

As the drilling environment became more challenging nowadays, managing equivalent circulating density (ECD) is a key factor to minimize non-productive time (NPT) due to many drilling obstacles such as stuck pipe, formation fracturing, and lost circulation. The goal of this work was to predict ECD prior to drilling by using artificial neural network (ANN). Once ECD is recognized, the crucial drilling variables impact ECD can be modified to control ECD within the acceptable ranges. Data from over 2000 wells collected worldwide were used in this study to create an ANN to predict ECD prior to drilling. Into training, validation, and ...


Critical Review Of Asphaltene Properties And Factors Impacting Its Stability In Crude Oil, Sherif Fakher, Mohamed Ahdaya, Mukhtar Elturki, Abdulmohsin Imqam Dec 2019

Critical Review Of Asphaltene Properties And Factors Impacting Its Stability In Crude Oil, Sherif Fakher, Mohamed Ahdaya, Mukhtar Elturki, Abdulmohsin Imqam

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Asphaltene is a component of crude oil that has been reported to cause severe problems during production and transportation of the oil from the reservoir. It is a solid component of the oil that has different structures and molecular makeup which makes it one of the most complex components of the oil. This research provides a detailed review of asphaltene properties, characteristics, and previous studies to construct a guideline to asphaltene and its impact on oil recovery. The research begins with an explanation of the main components of crude oil and their relation to asphaltene. The method by which asphaltene ...


Beneficial Mutations For Carotenoid Production Identified From Laboratory-Evolved Saccharomyces Cerevisiae, Avinash Godara, Maria Alejandra Gomez Rodriguez, Joshua Weatherston, George Peabody, Hung-Jen Wu, Katy Kao Dec 2019

Beneficial Mutations For Carotenoid Production Identified From Laboratory-Evolved Saccharomyces Cerevisiae, Avinash Godara, Maria Alejandra Gomez Rodriguez, Joshua Weatherston, George Peabody, Hung-Jen Wu, Katy Kao

Faculty Publications, Biomedical, Chemical, and Materials Engineering

Adaptive laboratory evolution (ALE) is a powerful tool used to increase strain fitness in the presence of environmental stressors. If production and strain fitness can be coupled, ALE can be used to increase product formation. In earlier work, carotenoids hyperproducing mutants were obtained using an ALE strategy. Here, de novo mutations were identified in hyperproducers, and reconstructed mutants were explored to determine the exact impact of each mutation on production and tolerance. A single mutation in YMRCTy1-3 conferred increased carotenoid production, and when combined with other beneficial mutations led to further increased β-carotene production. Findings also suggest that the ALE ...


Tracking Lysosome Migration Within Chinese Hamster Ovary (Cho) Cells Following Exposure To Nanosecond Pulsed Electric Fields, Gary L. Thompson Iii, Hope T. Beier, Bennett L. Ibey Nov 2019

Tracking Lysosome Migration Within Chinese Hamster Ovary (Cho) Cells Following Exposure To Nanosecond Pulsed Electric Fields, Gary L. Thompson Iii, Hope T. Beier, Bennett L. Ibey

Henry M. Rowan College of Engineering Faculty Scholarship

Above a threshold electric field strength, 600 ns-duration pulsed electric field (nsPEF) exposure substantially porates and permeabilizes cellular plasma membranes in aqueous solution to many small ions. Repetitive exposures increase permeabilization to calcium ions (Ca2+) in a dosage-dependent manner. Such exposure conditions can create relatively long-lived pores that reseal after passive lateral diffusion of lipids should have closed the pores. One explanation for eventual pore resealing is active membrane repair, and an ubiquitous repair mechanism in mammalian cells is lysosome exocytosis. A previous study shows that intracellular lysosome movement halts upon a 16.2 kV/cm, 600-ns PEF exposure ...


Cgste11 Mediates Cross Tolerance To Multiple Environmental Stressors In Candida Glabrata, Mian Huang, Jibran Khan, Manpreet Kaur, Julian Daniel Torres Vanega, Orlando Andres Aguilar Patiño, Anand Ramasubramanian, Katy Kao Nov 2019

Cgste11 Mediates Cross Tolerance To Multiple Environmental Stressors In Candida Glabrata, Mian Huang, Jibran Khan, Manpreet Kaur, Julian Daniel Torres Vanega, Orlando Andres Aguilar Patiño, Anand Ramasubramanian, Katy Kao

Faculty Publications, Biomedical, Chemical, and Materials Engineering

Candida glabrata is a human commensal and an opportunistic human fungal pathogen. It is more closely related to the model yeast Saccharomyces cerevisiae than other Candida spp. Compared with S. cerevisiae, C. glabrata exhibits higher innate tolerance to various environmental stressors, including hyperthermal stress. Here we investigate the molecular mechanisms of C. glabrata adaptation to heat stress via adaptive laboratory evolution. We show that all parallel evolved populations readily adapt to hyperthermal challenge (from 47 °C to 50 °C) and exhibit convergence in evolved phenotypes with extensive cross-tolerance to various other environmental stressors such as oxidants, acids, and alcohols. Genome ...


In-Situ Extraction And Impregnation Of Black Walnut Husk Into Polyethylene Film Using Supercritical Carbon Dioxide With An Ethanol Modifier, Johnathon Wenzel, Veronica Moorman, Lihua Wang, Cheryl S. Samaniego, Michelle Ammerman, Isaiah Spencer-Williams, Mitchell Hall Nov 2019

In-Situ Extraction And Impregnation Of Black Walnut Husk Into Polyethylene Film Using Supercritical Carbon Dioxide With An Ethanol Modifier, Johnathon Wenzel, Veronica Moorman, Lihua Wang, Cheryl S. Samaniego, Michelle Ammerman, Isaiah Spencer-Williams, Mitchell Hall

Chemical Engineering Publications

Walnuts are commonly cultivated for their kernel, which is a rich source of antioxidant phenolic compounds. The husk likewise contains antioxidant and antimicrobial compounds, but is typically discarded without further processing. Antioxidant compounds are useful in creating active packaging films, but typically decompose at melt extrusion temperatures in polymer processing. Due to carbon dioxide's low critical point and ability to swell polymer films, supercritical carbon dioxide may be used to impregnate phenolic compounds into polymers. For this study, a novel technique is used to simultaneously produce walnut husk extracts and impregnate the extract into polymer films in the same ...


Decorative Articles Based On Polymeric Materials, Bassant Hussein, Yasser M. Asal, M. A. Radwan, M. A. Sadek, Hany A. Elazab Nov 2019

Decorative Articles Based On Polymeric Materials, Bassant Hussein, Yasser M. Asal, M. A. Radwan, M. A. Sadek, Hany A. Elazab

Chemical Engineering

The aim of the research is to create decorative articles based on polymeric materials, study the effects of fillers and the type of moulds that it can cope with the exothermic reaction nature of resin to create a scientific background on the usage of the resins in daily life products. The polymeric materials that will be concentrated on are the unsaturated polyester resins and epoxy resins. The unsaturated polyester is of many types and chemical constituents, the used experimentally is a general-purpose type and the epoxy also have different types and the used is a commercially 3D floor coating type ...


Effect Of Annealing On The Contact Resistance Of Aluminum On A P-Type Substrate, Shrey Shah, George Patrick Watson Nov 2019

Effect Of Annealing On The Contact Resistance Of Aluminum On A P-Type Substrate, Shrey Shah, George Patrick Watson

Protocols and Reports

Aluminum contacts are widely used to form both ohmic and rectifying contacts. The process to form these contacts involves annealing, thus it is important to study the effect of annealing on the electrical properties of the contacts. Here, we present a way to measure the contact resistance of aluminum contacts formed on a p-type silicon substrate. It was found the contact resistivity decreased by an average of 18%. It was thus found that annealing at 400°C in a forming gas environment improves the electrical properties of aluminum contacts.


Novel Adsorbent For Industrial Wastewater Treatment Applications, Ahmed Y. Zakaria, Dalia A. Ali, Islam M. Al-Akraa, Hoda A. Elsawy, Hany A. Elazab Nov 2019

Novel Adsorbent For Industrial Wastewater Treatment Applications, Ahmed Y. Zakaria, Dalia A. Ali, Islam M. Al-Akraa, Hoda A. Elsawy, Hany A. Elazab

Chemical Engineering

In this study, the hydroxyapatite powder is investigated for both of methylene blue and thymol blue in aqueous solution. The physical and chemical properties of the adsorbent were evaluated systematically using the different techniques including Microsoft Excel programming, linear regression model and also the coefficient of determination. Batch adsorption experiments were conducted to determine the effect of contact time, solution pH, initial dye concentrations, and also the adsorbent dosage on adsorption. The adsorption kinetic parameters confirmed the better fitting of pseudo-second order kinetic model for both of methylene blue and thymol blue. The isotherm data of methylene blue and thymol ...


Microwave Assisted Synthesis Of Binary Metallic Oxides For Catalysis Applications, Abdelrahman Mostafa Kamal, Sherif Bahgat, Mohammed Hammam, M. A. Radwan, M. A. Sadek, Hany A. Elazab Nov 2019

Microwave Assisted Synthesis Of Binary Metallic Oxides For Catalysis Applications, Abdelrahman Mostafa Kamal, Sherif Bahgat, Mohammed Hammam, M. A. Radwan, M. A. Sadek, Hany A. Elazab

Chemical Engineering

Herein, versatile, and reproducible method to prepare binary metal oxides via microwave assisted synthesis. Catalysts are substances that basically speeds up chemical reactions. Ideally, bonds are formed between the catalysts and the reactants. Also, catalysts permits formation of products from the reactants. These formed products, splits off the catalyst without affecting or changing it. Catalytic kinetics studies the correlate chemical reaction rate with some properties of reactants and/or products for instance; temperature, concentration and pressure. The aim of the project is to prepare pure and bi-metal iron based catalyst by co-precipitation method and to characterize the prepared sample using ...


Composite Materials Based On Twaron And Nano Materials, Omnia Hamdy, Remon A. Mankarious, M. A. Radwan, M. A. Sadek, Hany A. Elazab Nov 2019

Composite Materials Based On Twaron And Nano Materials, Omnia Hamdy, Remon A. Mankarious, M. A. Radwan, M. A. Sadek, Hany A. Elazab

Chemical Engineering

This research aims to participate in producing body shield that can overcome pervious drawbacks using behaviour of shear thickening fluid. Initially, the rheological behaviour of silica-polyethylene glycol shear thickening fluid is examined at different concentrations. Then, ballistic fabric samples are impregnated into silica-polyethylene glycol shear thickening fluid at various concentrations of silica and tested using gas gun simulating real ballistic threat. After that, the impact of rubbery hot water pack filled with around 66.67 wt% starch in water is tested using gas gun. Results showed as the concentration of silica increases, the indentation depth in the impregnated fabric decreases ...


Understanding The Synthesis Of Supported Vanadium Oxide Catalysts Using Chemical Grafting, Alyssa M. Love, Melissa C. Cendejas, Michael P. Hanrahan, Scott L. Carnahan, Pajean Uchupalanun, Aaron J. Rossini, Ive Hermans Nov 2019

Understanding The Synthesis Of Supported Vanadium Oxide Catalysts Using Chemical Grafting, Alyssa M. Love, Melissa C. Cendejas, Michael P. Hanrahan, Scott L. Carnahan, Pajean Uchupalanun, Aaron J. Rossini, Ive Hermans

Chemistry Publications

The complexity of variables during incipient wetness impregnation synthesis of supported metal oxides precludes an in‐depth understanding of the chemical reactions governing the formation of the dispersed oxide sites. This contribution describes the use of vapor phase deposition chemistry (also known as grafting) as a tool to systematically investigate the influence of isopropanol solvent on VO(OiPr)3 anchoring during synthesis of vanadium oxide on silica. We find that the availability of anchoring sites on silica not only depends on the pretreatment of the silica but also on the solvent present. H‐bond donors can reduce the reactivity of ...


Periodic Operation Of A Dynamic Dna Origami Structure Utilizing The Hydrophilic–Hydrophobic Phase‐Transition Of Stimulus‐Sensitive Polypeptides, Marisa A. Goetzfried, Kilian Vogele, Andrea Mückl, Marcus Kaiser, Nolan B. Holland, Friedrich C. Simmel, Tobias Pirzer Nov 2019

Periodic Operation Of A Dynamic Dna Origami Structure Utilizing The Hydrophilic–Hydrophobic Phase‐Transition Of Stimulus‐Sensitive Polypeptides, Marisa A. Goetzfried, Kilian Vogele, Andrea Mückl, Marcus Kaiser, Nolan B. Holland, Friedrich C. Simmel, Tobias Pirzer

Chemical & Biomedical Engineering Faculty Publications

Dynamic DNA nanodevices are designed to perform structure‐encoded motion actuated by a variety of different physicochemical stimuli. In this context, hybrid devices utilizing other components than DNA have the potential to considerably expand the library of functionalities. Here, the reversible reconfiguration of a DNA origami structure using the stimulus sensitivity of elastin‐like polypeptides is reported. To this end, a rectangular sheet made using the DNA origami technique is functionalized with these peptides and by applying changes in salt concentration the hydrophilic–hydrophobic phase transition of these peptides actuate the folding of the structure. The on‐demand and reversible ...


Implementation Of Pseudo-Turbulence Closures In An Eulerian–Eulerian Two-Fluid Model For Non-Isothermal Gas–Solid Flow, Cheng Peng, B. Kong, Jiazhong Zhou, B. Sun, Alberto Passalacqua, Shankar Subramaniam, Rodney O. Fox Nov 2019

Implementation Of Pseudo-Turbulence Closures In An Eulerian–Eulerian Two-Fluid Model For Non-Isothermal Gas–Solid Flow, Cheng Peng, B. Kong, Jiazhong Zhou, B. Sun, Alberto Passalacqua, Shankar Subramaniam, Rodney O. Fox

Mechanical Engineering Publications

The Eulerian–Eulerian two-fluid model is widely used for computational fluid dynamics simulations of gas–solid flows. For non-isothermal flows, the averaged conservation equations solved in the two-fluid model require closures for drag, gas–solid heat transfer, pseudo-turbulent velocity fluctuations and the pseudo-turbulent heat flux (PTHF). However, the pseudo-turbulence terms are usually neglected in two-fluid simulations due to the lack of accurate correlations. With the increase in computational power, closures for these terms are now available from particle-resolved direct-numerical simulation (PR-DNS). Here, the PTHF closure as well as the heat-transfer closure (i.e., the Nusselt number) extracted from PR-DNS are ...


Decorative Articles Based On Polymeric Materials, Yaser M. Asal Mr., M. A. Radwan, Hany A. Elazab Dr, Bassant Hussein, Mohamed A. Sadek Nov 2019

Decorative Articles Based On Polymeric Materials, Yaser M. Asal Mr., M. A. Radwan, Hany A. Elazab Dr, Bassant Hussein, Mohamed A. Sadek

Chemical Engineering

The aim of the research is to create decorative articles based on polymeric materials, study the effects of fillers and the type of moulds that it can cope with the exothermic reaction nature of resin to create a scientific background on the usage of the resins in daily life products. The polymeric materials that will be concentrated on are the unsaturated polyester resins and epoxy resins. The unsaturated polyester is of many types and chemical constituents, the used experimentally is a general-purpose type and the epoxy also have different types and the used is a commercially 3D floor coating type ...


Alterations In Phenotype And Gene Expression Of Adult Human Aneurysmal Smooth Muscle Cells By Exogenous Nitric Oxide, Kurt Farrell, Phillip Simmers, Gautam Mahajana, Ludovic Boytard, Andrew Camardo, Jyotsna Joshi, Anand Ramamurthi, Florence Pine, Chandrasekhar R. Kothapalli Nov 2019

Alterations In Phenotype And Gene Expression Of Adult Human Aneurysmal Smooth Muscle Cells By Exogenous Nitric Oxide, Kurt Farrell, Phillip Simmers, Gautam Mahajana, Ludovic Boytard, Andrew Camardo, Jyotsna Joshi, Anand Ramamurthi, Florence Pine, Chandrasekhar R. Kothapalli

Chemical & Biomedical Engineering Faculty Publications

Abdominal aortic aneurysms (AAA) are characterized by matrix remodeling, elastin degradation, absence of nitric oxide (NO) signaling, and inflammation, influencing smooth muscle cell (SMC) phenotype and gene expression. Little is known about the biomolecular release and intrinsic biomechanics of human AAA-SMCs. NO delivery could be an attractive therapeutic strategy to restore lost functionality of AAA-SMCs by inhibiting inflammation and cell stiffening. We aim to establish the differences in phenotype and gene expression of adult human AAA-SMCs from healthy SMCs. Based on our previous study which showed benefits of optimal NO dosage delivered via S-Nitrosoglutathione (GSNO) to healthy aortic SMCs, we ...


Extraction And Visualization Of Orientation Data From Virtual Geologic Surfaces With Matlab®, Avery J. Welker, John Patrick Hogan, Andreas Eckert Nov 2019

Extraction And Visualization Of Orientation Data From Virtual Geologic Surfaces With Matlab®, Avery J. Welker, John Patrick Hogan, Andreas Eckert

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

High-resolution visualization of surfaces of geologic interest, at a multitude of scales, using 3D point cloud technologies provides an opportunity to analyze spatial relationships of surfaces using orientation data. We present a MATLAB® script that produces planar geologic attitude data (e.g., strike, dip, and dip-direction data) from 3D datasets (e.g., point clouds, 3D scanning). The method utilizes Cartesian coordinates of triangular planar surfaces and converts them into matrices of conventional geologic attitude data. Spatial relationships among data points can be investigated, using polar tangent diagrams, stereographic analysis, or geologic curvature analysis. We utilize this script to create "synthetic ...