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 34 for “"Polymer dynamics"”.
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Simulating Nanoparticle and Polymer Dynamics in Solution
The dynamics of nanoparticles in complex fluids are of great interest for applications in drug delivery, oil recovery, and materials processing. Particle mobility is well described by the generalized Stokes-Einstein (GSE) relation when the nanoparticles are much larger than the polymers. Violations …
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Single molecule studies of branched polymer dynamics
Polymer architecture plays a major role on the emergent physical and chemical properties of materials such as elasticity and wettability. Branched polymers exhibit strikingly different rheological behavior (e.g. enhanced stress dissipation and strain hardening) compared to linear polymers. In …
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Polymer dynamics and fluctuations probed with fluorescence methods
The arc of the thesis is direct measurement of polymer chain properties with potent fluorescence methods imported from other interdisciplinary sciences and applied successfully to polymer physics problems for the first time. The focus is an important theme in equilibrium polymer physics - chain …
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Polymer dynamics in crowded environment via single-molecule imaging
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Particle microstructure and polymer dynamics in concentrated polymer solutions
… of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… resonance (²H NMR) study of bulk and adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in polymer solutions by pulsed …
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Single molecule studies of branched polymer dynamics in non-dilute solutions
The macroscopic properties of polymers are dictated by their molecular architecture and microstructure. Branched polymers exhibit a multitude of distinct rheological phenomena, such as shear thinning and enhanced strain hardening, compared to linear polymers as a direct consequence of their …
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Single polymer dynamics in semi-dilute solutions: linear and ring polymers
"Synthetic and biological polymers are ubiquitous in nature and modern technologies. Traditional characterization methods of polymeric materials rely on bulk level measurements that can provide useful information on material properties. However, these methods generally cannot access underlying …
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Single stranded DNA: A new model system for single molecule polymer dynamics
The study of polymer dynamics has been an active area of research for many years. For nearly two decades, fluorescently-labeled double stranded DNA (dsDNA) has been the model system for studying single molecule polymer dynamics in non-equilibrium conditions. However, dsDNA is a semiflexible polymer …
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Ring polymer dynamics in dilute and concentrated solutions with advances in automated flow control
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Single molecule studies of polymers and self-assembling materials: Effects of chain topology and entanglements
Understanding the dynamics of polymer solutions and functional materials in nonequilibrium flow conditions is of key importance for controlling materials properties during processing, which often involves highly nonequilibrium states that cannot be understood in terms of equilibrium principles or …
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Single molecule studies of flexible polymer systems
Polymeric materials play a profound role in our daily lives. There have been many key advances in polymer processing over the last several decades, but much of the underlying molecular behavior and physics of polymer solutions is not fully understood. Single molecule studies of polymer solutions …
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Interactions and Dynamics of Soft Materials
… large part of my dissertation is related with polymer interfacial dynamics. As one of the center topics of polymer physics, many models have been generated to understand polymer dynamics in bulk solutions and in melt. However, to study the dynamics of polymer at the interfaces is more …
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Multi-scale modelling describing thermal behaviour of polymeric materials. Scalable lattice-Boltzmann models based upon the theory of Grmela towards refined thermal performance prediction of polymeric materials at micro and nano scales.
… into the fundamental mathematics behind polymer heat transfer and associated processes. The aim is to derive models for polymer dynamics, especially heat dynamics, that are considerably less approximate than the ones used at present, and to translate this into simulation and optimisation …
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Fluctuation theorems and work relations for single polymer rheology
"Synthetic and biological polymeric materials are ubiquitous in nature and modern technology. The emergent properties afforded by these materials allows for wide a array of applications as found in adhesives, coatings, and synthetic polymers for plastics. Importantly, the molecular properties of …
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Kinetic modeling of amyloid fibrillation and synaptic plasticity as memory loss and formation mechanisms
… gap we used chemical engineering concepts from polymer dynamics, particle mechanics and population balance models to develop a mathematical formulation of amyloid growth dynamics. A three-stage mechanism consisting of natural protein misfolding, nucleation, and fibril elongation phases was …
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THE FREQUENCY-DEPENDENCE OF THE NMR LONGITUDINAL RELAXATION RATE, T(1)(-1), OF WATER IN CYSTS OF THE BRINE SHRIMP (ARTEMIA)
… large molecules and termed "hydration water". A polymer-dynamics relaxation mechanism, which treats fluctuations of long-chain molecules in aqueous solution, has been proposed by Rorschach and Hazlewood to explain the relaxation in this second water phase. In one limit, this mechanism predicts a …
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Sensitivity and Memory in Physics and Biology
… and which perhaps even involve chemical dynamics coupled to the polymer dynamics of chromatin. I explore a simple biophysical model inspired by a class of these systems—involving the spreading of covalent modifications on chromatin—with the aim of uncovering qualitative features that can …
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Polymer Infiltration Under Extreme Confinement
Polymer nanocomposites with high nanoparticle loadings are ubiquitous in nature but difficult to replicate synthetically. A simple technique to create such polymer nanocomposites is to form a bi-layer of a nanoparticle thin film atop a polymer thin film and anneal above the polymer glass transition …
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