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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 16 of 16 for “"zero shear viscosity"”.
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A study of Asphalt Aging Behavior Using Molecular Dynamics Simulations
… by the increase of density, bulk modulus and viscosity. Considering the mechanical property of asphalt using MD simulations, both the unoxidized and oxidized asphalts deform more and fail faster with an increase in both compressive and tensile stress rates, especially under tensile stresses. …
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Structure, Rheology and Optical Properties of Plasmonic Fluids
… ratio. Specifically, non-monotonic dependence of zero shear viscosity on nanoparticle concentration, rheopexy, shear thickening, shear banding and shear thinning are observed. The fluids exhibit enhanced viscoelasticity upon the addition of more nanoparticles. The mechanical, rheological and …
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Flow Behavior of Sparsely Branched Metallocene-Catalyzed Polyethylenes
… branching are considered with respect to the shear and extensional rheological properties, the melt fracture behavior, and the ability to accurately predict the flow through an abrupt 4:1 contraction geometry. The effects that sparse long-chain branching (M<sub>branch</sub> > M<sub>c</sub>) …
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Spatiotemporal Signatures of Elastoinertial Turbulence
… quiescent water or polymer solution. In a free shear layer, fluid elasticity has a dichotomous effect on jet stability depending on its relative magnitude, creating two distinct regimes in which elastic effects can either destabilize or stabilize the jet. For small levels of elasticity an …
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An investigation of the biology and chemistry of the Chinese medicinal plant, Amorphophallus konjac
… Fourier-transform infrared spectral (FTIR) and zero shear viscosity analyses of the extract (PKF) were all consistent with the literature. Comparison of three existing methodologies for the quantitative analysis of the KGM content, namely 3,5-dinitrosalicylic acid (3,5-DNS), phenol-sulphuric …
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The nutritive, rheological and sensory quality of selected indigenous complementary foods used for 6 – 24 months infants and young children in African communities
… infants and young children. The flow properties (viscosity) of common indigenous/locally available African CPs (n = 8) plus CACFs (n = 23) were investigated at shear rates 0.001/s – 1000/s and 40 °C, using a rotational rheometer. The perception of the oral texture of the selected African CPs, …
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Non-Covalent Interactions in Polymeric Materials: From Ionomers to Polymer Blends
… longer relaxation time, and significantly higher zero-shear viscosity were noted for phosphonated ionomers by a dynamic melt rheology study. Compared to the ionic aggregates generated from sulfonate groups, larger ionic aggregates with associated phosphonate groups have been observed. Furthermore, …
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Structure, Dynamics and Rheology of Polymer Solutions from Coarse-Grained Molecular Dynamics: Effects of Polymer Concentration, Solvent Quality and Geometric Confinement
… the dynamics of a single</p> <p>polymer chain in shear flow. The effects of chain length and shear rate on the</p> <p>configuration statistics, e.g. tumbling frequency and orientation distribution of the end-toend</p> <p>vector, are presented and compared to experimental observations as well …
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Investigating Shear-induced Damage during Hydrogel Extrusion-based Manufacturing: Rheological Insights and Mechanophore Incorporation
… can incorporate viable cells. During printing, shear-induced forces can be imparted to destructively effect the mechanical properties of the hydrogel, damaging the gel structure and creating undesirable changes when compared to the original hydrogel properties. This research shows, through …
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Living Polymerization for the Introduction of Tailored Hydrogen Bonding
… poly(ethylene-co-propylene)s exhibited increased viscosity and shear thinning onset at lower frequencies than non-functional polymers of similar molar mass due to interaction of the multiple hydrogen bonding groups. Star-shaped UPy functional poly(ethylene-co-propylene)s showed inhibition to …
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STRUCTURE, DYNAMICS AND RHEOLOGY OF SURFACTANT MICELLES AND MICELLE-NANOPARTICLE SOLUTIONS: A MOLECULAR DYNAMICS STUDY
… add functionality to the fluid but also act as viscosity modifiers. Such solutions can be used to design active nanomaterials for applications in energy harvesting and sensing. While several theories and continuum-level computational models have been developed to study the dynamics and rheology …
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Ion and polymer transport in polymerized ionic liquids
… polymerization and dynamic properties including zero-shear viscosity (η0), storage (G’) and loss (G”) modulus were investigated. The degree of polymerization (N) of the intermediate bromide (Br) PILs was accurately characterized by size exclusion chromatography (SEC) with light scattering (LS). …
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Single Molecule Study of Polymer-Surfactant Interactions
… This behavior coincides with the behavior of the zero shear viscosity. Two different fractions viz fast diffusing fraction of dye molecule along with the larger aggregates are observed in between the critical aggregation concentration (CAC) and end of aggregation (EOA). FCS is used to follow the …
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Physical properties of functional fermented milk produced with exopolysaccharide-producing strains of Streptococcus thermophilus
… was less responsive to temperature with a higher zero shear viscosity ηo (14.36 to 150.82 mPa s) than capsular EPS (93.72 to 9.24 mPa s), and slightly higher relaxation time τ (0.43 to 15.82 s for capsular-ropy EPS and 0.72 to 9.36 s for capsular EPS). The opposite behavior was observed under …
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Structure-property relationships in polymeric materials via advanced rheological and neutron scattering techniques
… flows such as large-amplitude oscillatory shear (LAOS) flows, tend to generate complex material responses. Several analysis approaches have been suggested to interpret the underlying material physics. Despite recent progress in understanding the macroscopic response, the vast majority of …
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The dynamics of polymer solutions: Effects of concentration, chain architecture, and flow
… reproduce the polymer diffusion constant and zero-shear viscosity as a function of concentration and molecular weight. We then extend the semidilute CA method to non-equilibrium systems by introducing appropriate flowing boundary conditions and generalizing the Brownian noise average to …