Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Polyethylene Oxide (peo)"”.
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A study of long time behavior of aqueous solution of polyethylene oxide (Peo) and aqueous salt (potassium sulfate) solution of Peo using dynamic light scattering
… time behavior of dilute aqueous solutions of polyethylene oxide (PEO) and the properties of dilute aqueous salt (K{dollar}\sb2{dollar}SO{dollar}\sb4{dollar}) solutions of PEO by using the dynamic light scattering technique; The long time study measurement results indicated that the values of …
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Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
… methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, resulting in quasi-2D confinement of the backbone at the immediate surface. The branched architecture and amphiphilic chemistry of these …
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Self-assembly of linear-dendritic diblock copolymers
… here consists of 2000 molecular weight linear polyethylene oxide (PEO) with a polyamidoamine (PAMAM) dendron covalently bonded to one chain end. Specular neutron reflectivity has been used to investigate the structure of monolayers formed at an air-water interface. The dendritic end groups were …
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Poly(Ethylene Oxide)/Graphene Oxide Polymer Nanocomposite Electrolyte for Lithium Ion Batteries
… polymer electrolytes. In this study, graphene oxide (GO) nanosheets were used as nanosized fillers in polyethylene oxide (PEO) electrolyte. We demonstrated that about an order of magnitude improvement in lithium-ion conductivity, as high as 10-4 S/cm at room temperature, was achieved with GO …
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Mechanical characteristics of organically modified fly ash-kaolinite mixtures
… and Xanthan gum) and synthetic polymers (Polyethylene Oxide, PEO) were used instead of the traditional stabilizers to improve the engineering behaviors of fly ash-kaolinite mixtures. The effects of polymers on microstructure development and geotechnical properties (i.e., stiffness, …
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Wetting kinetics in forced spreading
… water under PDMS, for solutions of the polymer polyethylene oxide (PEO) under air, for solutions of PEO under PDMS, were obtained to simulate and understand the systems of brine or brine containing a polymer displacing viscous crude. A variety of solid substrates were used other than above to …
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Enhancing Interfaces in Solid Polymer Electrolyte-Based Flexible Lithium-Ion Batteries
… work were used to predict the diffusion in polyethylene oxide (PEO) based cathode-electrolyte interface system. Based on outcome of this study, blended polymer electrolyte and innovative current collector are proposed as promising material solutions for higher performance flexible …
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NMR investigations of ionic host polymer systems
… archetypal ionic host polymer system, in which polyethylene oxide (PEO) forms the polymer host, and lithium trifluoromethanesulphonate (LiCF3S03) is the guest ionic salt, are reported. The work is primarily concerned with the ability of the polymer host to incorporate the guest salt within its …
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Optimization of chemical enhanced oil recovery methods for naturally fractured carbonate reservoirs
… of the viscous phase trapped in the fracture, polyethylene oxide (PEO) polymer was investigated for mobility control. Coreflood experiments demonstrated the viability for using PEO in 18 mD cores. PEO significantly improved oil recovery in a fractured core. The viscosity and cloud point of the …
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An investigation into the structure and properties of polyethylene oxide nanocomposites
… and electrical properties of poly(ethylene oxide) systems. The initial objective is to investigate the extent to which dispersion of nanofillers and effect of host molecular weight can be inferred from rheological analysis. This investigation covers many systems based upon polyethylene oxide …
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Fluid mechanics of liquid drops and thin-films
… fluids are dewetted on a substrate. By using polyethylene oxide (PEO) aqueous solutions on a polydimethyl siloxane (PDMS) substrate, thin-film dynamics is investigated. Linear stability analysis of the thin-film yields a theoretical critical film thickness at an early stage. When the measured …
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Modeling Heat Transfer and Densification during Laser Sintering of Viscoelastic Polymers
… (PC) and three molecular weights of polyethylene-oxide (PEO) was predicted using the aforementioned thermal and sintering models. Samples were fabricated using the lab-scale LS unit and the sintered microstructures were investigated using scanning electron microscopy. The rheologic, …
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Rheology and Microstructure of Filled Polymer Melts
… dispersions are studied in low molecular weight polyethylene oxide (PEO), polyethylene oxide dimethylether (PEODME), and polytetrahydrofuran (PTHF). Scattering measurements of the particle second virial coefficient in PEO melts indicates repulsive particles by a value slightly greater than unity. …
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MULTI-IONIC LITHIUM SALTS FOR USE IN SOLID POLYMER ELECTROLYTES FOR LITHIUM BATTERIES
… in the most studied polymer electrolyte, polyethylene oxide (PEO), on finding methods to promote directed ion transport, and on the development of single ion conductors, where the anions are immobile and only the Li+ ions migrate (i.e. tLi+ = 1). But these attempts have not yet achieved …
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Design, Development and Structure of Liquid and Solid Electrolytes for Lithium Batteries
… were composed of the following four components; polyethylene oxide (PEO), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, lithium lanthanum titanate (LLTO) perovskite inorganic ceramic and the polymer plasticizer succinonitrile (SN). The careful formulation of these CSEs was based on …
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Evaluation of slurry injection for the determination of metals in solid samples using inductively coupled plasma atomic emission spectrometry
… was used. A surfactant/thickening agent, polyethylene oxide (PEO), was added to alter such physical properties of the slurry as surface tension, viscosity, and aerosol droplet size. Mixed gas plasma containing small amounts of nitrogen were used. Results showed that, by adding about 5 ppm …
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Electrostatic powder deposition as a dry powder process to prepare orodispersible films
… process to prepare ODFs. Low molecular weight polyethylene oxide (PEO) was investigated as the film-forming polymer for use with ESPD. The influence of processing parameters, such as charging voltage, curing conditions, and substrate roughness, on PEO deposition behavior and film formation were …
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Gas Jet Process for Production of Sub-micron Fibers
… immiscible polymers. Polyvinyl acetate (PVAc), polyethylene oxide (PEO), and polyvinyl pyrrolidone (PVP) were used to create compound fibers with different sizes and configurations. Second, the production of bi-component nanofibers with controlled morphology produced from homogeneous solutions …
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Direct ink writing of microvascular networks
… solutions composed of a triblock copolymer of polyethylene oxide (PEO)-polypropylene oxide (PPO)-PEO constitute the materials system of choice due to their thermal- and concentration-dependent phase behavior. Specifically, the fugitive ink consists of a 23 w/w% PEO-PPO-PEO (Pluronic F127) …
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An experimental and theoretical investigation of the rheological properties and degradation of mucin solutions : (or why saliva becomes watery when removed from your mouth)
… predict the extensional behaviour of both polyethylene oxide (PEO) solutions and saliva based on actual properties of these materials. This model cannot capture the sudden filament breakup observed in young saliva samples, however, which motivates the incorporation of a mechanism for …
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