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262 full-text articles. Page 3 of 9.

Investigation And Modeling Of Dip-Coating Process For Dispersions, Mahyar Javidi Soufiani 2016 The University of Western Ontario

Investigation And Modeling Of Dip-Coating Process For Dispersions, Mahyar Javidi Soufiani

Electronic Thesis and Dissertation Repository

Dip coating of liquid film deposition on cylindrical substrates is studied using mathematical modeling, numerical simulation and experimental investigation. A mathematical model based on the Landau-Levich approach for dip coating has been developed using the Ellis constitutive equation, for cylindrical geometries, to analyze the effects on the coating thickness of the substrate radius and hydrodynamic behavior for a non-Newtonian fluid. The influence of the viscosity at low shear rates near the surface of the withdrawal film is included in the Ellis model and coating thickness results for Ellis, power law and Newtonian models are compared with experimental data. Good agreement ...


Procesy Cieplne I Aparaty (Lab), Wojciech M. Budzianowski 2016 Wroclaw University of Technology

Procesy Cieplne I Aparaty (Lab), Wojciech M. Budzianowski

Wojciech Budzianowski

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Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger 2016 Iowa State University

Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger

Mechanical Engineering Publications

Superhydrophobic surfaces with the self-cleaning behavior of lotus leaves are sought for drag reduction and phase change heat transfer applications. These superrepellent surfaces have traditionally been fabricated by random or deterministic texturing of a hydrophobic material. Recently, superrepellent surfaces have also been made from hydrophilic materials, by deterministic texturing using photolithography, without low-surface energy coating. Here, we show that hydrophilic materials can also be made superrepellent to water by chemical texturing, a stochastic rather than deterministic process. These metallic surfaces are the first analog of lotus leaves, in terms of wettability, texture and repellency. A mechanistic model is also proposed ...


Structure And Dynamics Of Charged Colloidal Disks In Colloid-Polymer Mixtures, Suhasini Kishore 2016 University of Massachusetts Amherst

Structure And Dynamics Of Charged Colloidal Disks In Colloid-Polymer Mixtures, Suhasini Kishore

Doctoral Dissertations

Complex fluid mixtures of colloids and polymers are extensively used in several conventional and emerging technological applications. Particles self-assemble under different conditions to form colloidal glasses and gels and it often leads to the development of unusual viscoelastic features. In the case of aspherical particles, shape anisotropy and physical aging effects add to the existing complexities so the implementation of a strategic formulation method to improve performance and stability remains a critical challenge.

This thesis presents a comprehensive analysis of particle interactions in mixtures of charged disk-shaped colloids and weakly-adsorbing polymers like poly(ethylene oxide) (PEO). Here, we discuss the ...


Inżynieria Chemiczna Lab., Wojciech M. Budzianowski 2015 Wroclaw University of Technology

Inżynieria Chemiczna Lab., Wojciech M. Budzianowski

Wojciech Budzianowski

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Proceedings Of The 1st Resrb 2016 Conference, June 22-24, 2016, Wrocław, Poland, Wojciech M. Budzianowski 2015 Wojciech Budzianowski Consulting Services

Proceedings Of The 1st Resrb 2016 Conference, June 22-24, 2016, Wrocław, Poland, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Biomolecular Interactions Control The Shape Of Stains From Drying Droplets Of Complex Fluids, Cedric Hurth, Ranjeesh Bhardwaj, Sahar Andalib, Christophe Frankiewicz, Andrew Dobos, Daniel Attinger, Frederic Zenhausern 2015 University of Arizona

Biomolecular Interactions Control The Shape Of Stains From Drying Droplets Of Complex Fluids, Cedric Hurth, Ranjeesh Bhardwaj, Sahar Andalib, Christophe Frankiewicz, Andrew Dobos, Daniel Attinger, Frederic Zenhausern

Mechanical Engineering Publications

When a sessile droplet of a complex fluid dries, a stain forms on the solid surface. The structure and pattern of the stain can be used to detect the presence of a specific chemical compound in the sessile droplet. In the present work, we investigate what parameters of the stain or its formation can be used to characterize the specific interaction between an aqueous dispersion of beads and its receptor immobilized on the surface. We use the biotin-streptavidin system as an experimental model. Clear dissimilarities were observed in the drying sequences on streptavidin-coated substrates of droplets of aqueous solutions containing ...


Solution-Based Synthesis Of Gete Octahedra At Low Temperature, Stephen Schulz, Stefan Heimann, Kevin Kaiser, Oleg Prymak, Wilifried Assenmacher, Jorg Thomas Bruggemann, Bert Mallick, Anja V. Mudring 2015 University of Duisburg-Essen

Solution-Based Synthesis Of Gete Octahedra At Low Temperature, Stephen Schulz, Stefan Heimann, Kevin Kaiser, Oleg Prymak, Wilifried Assenmacher, Jorg Thomas Bruggemann, Bert Mallick, Anja V. Mudring

Anja V. Mudring

GeTe octahedra were prepared by reaction of equimolar amounts of GeCl2·dioxane and Te(SiEt3)2 in oleylamine, whereas a slight excess of the Te precursor yielded GeTe octahedra decorated with elemental Te nanowires, which can be removed by washing with TOP. The mechanism of the GeTe formation is strongly influenced by the solvent. The expected elimination of Et3SiCl (dehalosilylation) only occurred in aprotic solvents, whereas Te(SiEt3)2 was found to react with primary and secondary amines with formation of silylamines. Temperature-dependent studies on the reaction in oleylamine showed that crystalline GeTe particles are formed at temperatures higher than ...


Influence Of The Counteranion On The Ability Of 1-Dodecyl-3-Methyltriazolium Ionic Liquids To Form Mesophases, Kathrin Stappert, Derya Unal, Eike T. Spielberg, Anja V. Mudring 2015 Ruhr-Universitat Bochum

Influence Of The Counteranion On The Ability Of 1-Dodecyl-3-Methyltriazolium Ionic Liquids To Form Mesophases, Kathrin Stappert, Derya Unal, Eike T. Spielberg, Anja V. Mudring

Anja V. Mudring

The influence of the counteranion on the ability of the mesogenic cation 1-methyl-3-dodecyl-triazolium to form mesophases is explored. To that avail, salts of the cation with anions of different size, shape, and hydrogen bonding capability such as Cl–, Br–, I–, I3–, PF6–, and Tf2N– [bis(trifluorosulfonyl)amide] were synthesized and characterized. The crystal structures of the bromide, the iodide, and the triiodide reveal that the cations form bilayers with cations oriented in opposite directions featuring interdigitated alkyl tails. Within the layers, the cations are separated by anions. The rod-shaped triiodide anion forces the triazolium cation to align with it in ...


Development Of A Parallel Multiphase Lattice-Boltzmann Solver To Study Stokes Number Effects On Particle Trajectories, Lenan Zhang, Anand Samuel Jebakumar, John Abraham 2015 Purdue University

Development Of A Parallel Multiphase Lattice-Boltzmann Solver To Study Stokes Number Effects On Particle Trajectories, Lenan Zhang, Anand Samuel Jebakumar, John Abraham

The Summer Undergraduate Research Fellowship (SURF) Symposium

Particle-laden flows are important owing to their relevance to many engineering devices such as coal combustors, gasifiers and solar thermochemical reactors. In a recent experimental study by Lau and Nathan [1], it was found that particles in a turbulent pipe flow tend to migrate preferentially depending on their Stokes number (St). Particles with a high St (>10) are concentrated near the axis while those with low St (


A Computational Study Of The Potential For Lng Tanker Polystyrene Foam Insulation Failure Under Fire Exposure, Jeffrey David Martinez 2015 University of Arkansas, Fayetteville

A Computational Study Of The Potential For Lng Tanker Polystyrene Foam Insulation Failure Under Fire Exposure, Jeffrey David Martinez

Theses and Dissertations

Liquefied natural gas is shipped across the oceans in large marine carriers. The carriers house the LNG using several different insulation systems. One of these systems involves large aluminum spheres insulated with polystyrene foam. Polystyrene foam is very susceptible to heat degradation. This raised issues as to the extent of possible insulation failure caused by a large ship fire. Experiments were done investigating the nature of polystyrene’s thermal degradation, notably by Brauman, Chen, and Matzinger and Butler. A large scale investigation was also performed by Sandia National Laboratory. However, computational modeling of the degradation was lacking. This work set ...


Novel Separation Methods Using Electrodialysis/Electrodeionization For Product Recovery And Power Generation, Alexander Miguel Lopez-Rosa 2015 University of Arkansas, Fayetteville

Novel Separation Methods Using Electrodialysis/Electrodeionization For Product Recovery And Power Generation, Alexander Miguel Lopez-Rosa

Theses and Dissertations

The use of electrodialytic separations for the purification of products has been a vital technique for the past 50 years in the chemical industry. Originally used for demineralization and desalination, electrodialysis and its counterparts have expanded to assist in product purification, waste and hazard removal, and power generation. This research focused on the development of high purity organic acids purification with low power requirements. Work resulted in the development of a new type of electrodialysis process, specifically the use of ionic liquids as a secondary solvent for the development of dual solvent electrodialysis. Through dual solvent electrodialysis, ions were recovered ...


A Microfluidic Reactor For Energy Applications, Luke T. Wagner, Jie Yang, Susan Ghobadian, Reza Montazami, Nicole N. Hashemi 2015 Iowa State University

A Microfluidic Reactor For Energy Applications, Luke T. Wagner, Jie Yang, Susan Ghobadian, Reza Montazami, Nicole N. Hashemi

Nicole N. Hashemi

Miniature microbial fuel cells have recently drawn lots of attention as portable power generation devices due to their short startup time and environmentally-friendly process which could be used for powering small integrated biosensors. We designed and fabricated a microbial fuel cell in a microfluidic platform. The device was made in polydimethylsiloxane with a volume of 4 μL and consisted of two carbon cloth electrodes and proton exchange membrane. Shewanella Oneidensis MR-1 was chosen to be the electrogenic bacterial strain and inoculated into the anode chamber. Ferricyanide was used as the catholyte and pumped into the cathode chamber at a constant ...


Enhancing Co−Water Mass Transfer By Functionalized Mcm41 Nanoparticles, Haiyang Zhu, Brent H. Shanks, Theodore J. Heindel 2015 Iowa State University

Enhancing Co−Water Mass Transfer By Functionalized Mcm41 Nanoparticles, Haiyang Zhu, Brent H. Shanks, Theodore J. Heindel

Brent H Shanks

Organic groups are grafted to 250-nm-diameter MCM41 nanoparticles with a spherical morphology to enhance the CO−water volumetric mass-transfer coefficient (kLa) for synthesis gas fermentation. The results indicate that (i) 250-nm MCM41 nanoparticles show a higherkLa value than large silica particles (1.4 and 7 μm), (ii) surface hydroxyl groups on MCM41 nanoparticles play an important role in mass-transfer enhancement, (iii) organic groups grafted to MCM41 modify the mass-transfer enhancement, and (iv) mercaptan groups grafted to MCM41 show the most mass-transfer enhancement of 1.9 times that of no nanoparticle addition. The CO−water mass-transfer enhancement depends on the interaction ...


Separation Of The Petroleum System, Ali Ibrahim Neamah 2015 Western Michigan University

Separation Of The Petroleum System, Ali Ibrahim Neamah

Ali Ibrahim Neamah

This study discusses the overall process of crude oil separation as well as the necessary equipment used in the process. Also discussed and analyzed are potential issues seen in the crude oil extraction process. Reasons why these operation problems may occur are analyzed as well as treatment options for such occurring issues are discussed for employees and students alike. This research is based off of personal involvement at the Nasiriyah Degassing Station located in Dhi Qar, Iraq.


Influence Of The Counteranion On The Ability Of 1-Dodecyl-3-Methyltriazolium Ionic Liquids To Form Mesophases, Kathrin Stappert, Derya Unal, Eike T. Spielberg, Anja V. Mudring 2015 Ruhr-Universitat Bochum

Influence Of The Counteranion On The Ability Of 1-Dodecyl-3-Methyltriazolium Ionic Liquids To Form Mesophases, Kathrin Stappert, Derya Unal, Eike T. Spielberg, Anja V. Mudring

Materials Science and Engineering Publications

The influence of the counteranion on the ability of the mesogenic cation 1-methyl-3-dodecyl-triazolium to form mesophases is explored. To that avail, salts of the cation with anions of different size, shape, and hydrogen bonding capability such as Cl, Br, I, I3, PF6, and Tf2N [bis(trifluorosulfonyl)amide] were synthesized and characterized. The crystal structures of the bromide, the iodide, and the triiodide reveal that the cations form bilayers with cations oriented in opposite directions featuring interdigitated alkyl tails. Within the layers, the cations are separated by anions. The rod-shaped triiodide anion forces the triazolium cation to ...


Azobenzene-Based Organic Salts With Ionic Liquid And Liquid Crystalline Properties, Kathrin Stappert, Johanna Muthmann, Eike T. Spielberg, Anja Mudring 2015 Ruhr-Universitat Bochum

Azobenzene-Based Organic Salts With Ionic Liquid And Liquid Crystalline Properties, Kathrin Stappert, Johanna Muthmann, Eike T. Spielberg, Anja Mudring

Materials Science and Engineering Publications

Two sets of new azobenzene-based bromide salts are synthesized, and their thermal photochromic properties are studied. Both sets are based on the imidazolium cation. The first set (1) features a symmetric biscation where two imidazolium head groups (Im) with different alkyl chains (Cn) are connected to a central azobenzene unit (Azo): [Azo(C1-Im-Cn)2]; n = 6, 8, 10, 12, 14. The other one contains an n-alkyl-imidazolium cation (Cn-Im) bearing a terminal azobenzene unit (C1-Azo) substituted with an alkoxy chain (O-Cm) of either two (2) or six (3) carbon atoms: [C1-Azo-O-Cm-Im-Cn]; m = 2, n = 8, 10, 12 ...


Bodipy-Derived Photoremovable Protecting Groups Unmasked With Green Light, Pratik P. Goswami, Aleem Ayed, Christie L. Beck, Toshia R. Albright, Kaitlyn M. Mahoney, Ryan Unash, Emily A. Smith, Arthur Winter 2015 Iowa State University

Bodipy-Derived Photoremovable Protecting Groups Unmasked With Green Light, Pratik P. Goswami, Aleem Ayed, Christie L. Beck, Toshia R. Albright, Kaitlyn M. Mahoney, Ryan Unash, Emily A. Smith, Arthur Winter

Chemistry Publications

Photoremovable protecting groups derived from meso-substituted BODIPY dyes release acetic acid with green wavelengths >500 nm. Photorelease is demonstrated in cultured S2 cells. The photocaging structures were identified by our previously proposed strategy of computationally searching for carbocations with low-energy diradical states as a possible indicator of a nearby productive conical intersection. The superior optical properties of these photocages make them promising alternatives to the popular o-nitrobenzyl photocage systems.


Coalescence-Induced Jumping Of Droplet: Inertia And Viscosity Effects, Samaneh Farokhirad, Jeffrey F. Morris, Taehun Lee 2015 CUNY City College

Coalescence-Induced Jumping Of Droplet: Inertia And Viscosity Effects, Samaneh Farokhirad, Jeffrey F. Morris, Taehun Lee

Publications and Research

The problem of coalescence-induced self-propelled jumping of droplet is studied using three-dimensional numerical simulation. The focus is on the effect of inertia and in particular the effect of air density on the behavior of the merged droplet during jumping. A lattice Boltzmann method is used for two identical, static micro-droplets coalescing on a homogeneous substrate with contact angle ranging from 0◦ to 180◦. The results reveal that the effect of air density is significant on detachment of the merged droplet from the substrate at the later stage of the jumping process; the larger the air density, the larger the jumping ...


Hydrocarbon Liquid Production Via Catalytic Hydroprocessing Of Phenolic Oils Fractionated From Fast Pyrolysis Of Red Oak And Corn Stover, Douglas C. Elliott, Huamin Wang, Marjorie Rover, Lysle Ervin Whitmer, Ryan G. Smith, Robert C. Brown 2015 Pacific Northwest National Laboratory

Hydrocarbon Liquid Production Via Catalytic Hydroprocessing Of Phenolic Oils Fractionated From Fast Pyrolysis Of Red Oak And Corn Stover, Douglas C. Elliott, Huamin Wang, Marjorie Rover, Lysle Ervin Whitmer, Ryan G. Smith, Robert C. Brown

Mechanical Engineering Publications

Phenolic oils were produced from fast pyrolysis of two different biomass feedstocks, red oak and corn stover, and evaluated in hydroprocessing tests for production of liquid hydrocarbon products. The phenolic oils were produced with a bio-oil fractionating process in combination with a simple water wash of the heavy ends from the fractionating process. Phenolic oils derived from the pyrolysis of red oak and corn stover were recovered with yields (wet biomass basis) of 28.7 and 14.9 wt %, respectively, and 54.3% and 60.0% on a carbon basis. Both precious metal catalysts and sulfided base metal catalyst were ...


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