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Filtering by: Creator DeVault, Travis L. Remove constraint Creator: DeVault, Travis L. Degree Field Chemical Engineering Remove constraint Degree Field: Chemical Engineering

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  • Extensional characterization of weakly-viscoelastic fluids : methods & applications

    Creator:
    Marshall, Kristin A.
    Abstract:
    The addition of macromolecules to solvent, even in dilute quantities, can significantly alter a fluid's response in an extensional, or stretching, flow. When high-molecular-weight polymers are extended in solution, extensional thickening can result, yielding viscosities that are orders of magnitude larger than values found in shear. Examples of applications where...
    Resource Type:
    Masters Thesis
    Full Text:
    Characterization of Weakly-Viscoelastic Fluids: Methods & Applications Abstract approved: Travis W. Walker The

  • Investigating the Effect of Tetrahydrofuran (THF) Plasticizer on the Crystallization and Solvent Seaming of PET/NPG Copolymer Films

    Creator:
    Srivastava, Aarushi
    Abstract:
    Polyethylene terephthalate (PET) polymer has been the material of choice for packaging industry as a result of its excellent mechanical and physical properties. These properties are highly dependent on the microstructure, chemistry, and processing conditions of this material. PET is often oriented in the machine direction (MD), the transverse direction...
    Resource Type:
    Masters Thesis
    Full Text:
    Copolymer Films Abstract approved: Travis W. Walker Polyethylene terephthalate (PET) polymer has been the

  • SwannBritanyM2017.pdf

    Creator:
    Swann, Britany and Swann, Britany M.
    Abstract:
    Additive manufacturing and 3D printing have become household names as both hobbyistsand industrial manufacturers utilize fast, inexpensive prototyping and production of functionalparts. Additive manufacturing is being revolutionized with 3D printers such as theMulti Jet Fusion 3D from HP, Inc., where each volume pixel, or voxel, can be independentlyfunctionalized. Voxel-by-voxel printing...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Travis W. Walker Additive manufacturing and 3D printing have become household names as

  • Frequency-Dependent Rheological Characterization of Viscoelastic Materials Using Magnetic Nanoparticle Probes

    Creator:
    Myers, Renee C.
    Abstract:
    Extending rheological characterization methods to very small length scales is of interest. AC susceptometry using magnetic nanoparticle probes has been proposed for measurement of frequency-dependent rheological properties at the nanoscale. As this technique has been primarily used for ideally Newtonian fluids, this research aimed to extend this technique to viscoelastic...
    Resource Type:
    Honors College Thesis
    Full Text:
    _____________________________________________________________________ Travis Walker, Committee Member, representing Chemical Engineering

  • A Novel Apparatus for Measuring the Interfacial Shear Rheology of Biofilms while Measuring the Concentration of Redox Species in the Growth Media

    Creator:
    Gahan, Curran G.
    Abstract:
    This project discuses the design of a novel apparatus for measuring the interfacial rheological properties of a complex interface while measuring the concentration of redox species within the sub-phase. Preliminary measurements made using the apparatus are also presented. The objective of the preliminary experimentation was to simultaneously measure the interfacial...
    Resource Type:
    Honors College Thesis
    Full Text:
    : ________________________________________________________________________ Travis W. Walker This project discuses the design of a novel apparatus for measuring the

  • Langmuir-Pockels Trough with Double Wall Couette for Measuring Interfacial Rheology of Insoluble Surfactants

    Creator:
    Turner, Christine
    Abstract:
    Insoluble surfactants are unique molecules that have the ability to manipulate interfacial properties, becoming useful in numerous applications such as detergents, wetting agents, emulsifiers, foaming agents, dispersants, and more. Interfacial rheology is a field that attempts to characterize the flow properties of insoluble surfactants by exerting a stress on the...
    Resource Type:
    Honors College Thesis
    Full Text:
    : ______________________________________________________ Travis W. Walker Insoluble surfactants are unique molecules that have the ability to

  • Transient Microrheological Characterization of Biogels

    Creator:
    Mao, Yating
    Abstract:
    The Brownian motion of micron-scale particles reflects the viscoelastic response of the local environment of the medium. Tracking the thermal fluctuations of these particles is a measure of the rheology of the material at the microscopic scale. This technique is called passive microrheology. Microrheology has been developed to assess the...
    Resource Type:
    Masters Thesis
    Full Text:
    Microrheological Characterization of Biogels Abstract approved: Travis W. Walker The Brownian motion of micron

  • Concentration Effects on Enhanced Particle Removal with Viscoelastic Fluids

    Creator:
    Cashen, Ryan K.
    Abstract:
    Highly elastic solutions have been shown to increase contaminant removal from silicon wafers, indicating the possibility for reduced reliance upon hazardous chemicals and expensive technologies during the fabrication of semiconductor devices. The onset of this enhanced removal is explored using rinsing and siphoning experimentswith polymer fluids of high molecular weights...
    Resource Type:
    Honors College Thesis
    Full Text:
    Abstract approved: Travis Walker Highly elastic solutions have been shown to increase contaminant removal

  • A study of the dynamics and rheology of passive and active suspensions of particles with various geometries

    Creator:
    Tan, Mingyang
    Abstract:
    Suspensions of particles in fluids are everywhere in our life, such as paints, pharmacies, food, etc. Suspensions can exhibit properties that common fluids do not possess. For example, the paint needs to flow well when brushing so that it can be smeared on the wall, which is aided by the...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Travis W. Walker Suspensions of particles in fluids are everywhere in our life, such

  • Photochemical reduction of carbon dioxide in aqueous and ionic liquid solutions in a microreactor with TiO₂ catalyst; experiment and modeling

    Creator:
    Campbell, Travis J.
    Abstract:
    Microtechnology was used to study the chemical reduction of dissolved carbon dioxide into useful products. A novel TiO₂ photocatalyst was used to activate the reaction under ultraviolet irradiation. CO₂ was dissolved in aqueous and 50% BMIM-BF₄ (ionic liquid) solutions. The introduction of an ionic liquid increased the solubility of CO₂...
    Resource Type:
    Masters Thesis
    Full Text:
    Travis J. Campbell for the degree of Master of Science in Chemical Engineering presented on May 14