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 23 for “"hard spheres"”.
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Depletion Attractions Between Hard Spheres: Comparisons of Theory and Experiment
In this thesis, the phase behavior and osmotic compressibility of model athermal silica - polystyrene suspensions has been determined over nearly two orders of magnitude in polymer/colloid size asymmetry. Fluid-gel, fluid-crystal, and fluid-fluid transitions are observed as Rg, the polymer radius …
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Monte Carlo Methods: Application to Hydrogen Gas and Hard Spheres
The challenges in constructing an efficient CEIMC simulation center mostly around the noisy results generated from the QMC computations of the electronic energy. We introduce two complementary techniques, one for tolerating the noise and the other for reducing it. The penalty method modifies the …
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Monte Carlo methods: application to hydrogen gas and hard spheres
… These methods are applied to a system of boson hard spheres to get exact, infinite system size results for the ground state at several densities. The kinds of problems that can be simulated with Monte Carlo methods are expanded through the development of new algorithms for combining a QMC …
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Thermosensitive Injectable Pluronic Hydrogels for Controlled Drug Release: Characterisation of thermal, rheological and structural properties of injectable pharmaceutical formulations
… in reduced gelation temperature and smaller hard spheres without having a great effect on the system rheological properties compared to neat gels. Blends containing both additives PEG and ibuprofen exhibited a synergistic effect, where comparisons show that Ibuprofen had the largest effect on …
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Thermosensitive Injectable Pluronic Hydrogels for Controlled Drug Release: Characterisation of thermal, rheological and structural properties of injectable pharmaceutical formulations
… in reduced gelation temperature and smaller hard spheres without having a great effect on the system rheological properties compared to neat gels. Blends containing both additives PEG and ibuprofen exhibited a synergistic effect, where comparisons show that Ibuprofen had the largest effect on …
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Real-time rheological investigation of complex behaviour in cornstarch suspensions
… such as cornstarch (deviating from monodisperse hard spheres).
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Novel Quantum Monte Carlo Approaches for Quantum Liquids
… methods to explore two new phases of quantum hard spheres and hydrogen. I lay the foundation for a subsequent description of my research by first reviewing the physics of quantum liquids in Chapter One and the mathematics behind Quantum Monte Carlo algorithms in Chapter Two. I then discuss the …
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Polymers, Nanoparticles and Phospholipids
… functionalizable compared with the conventional hard spheres.
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Kac's process and some probabilistic aspects of the Boltzmann equation
… Kac models. In the first case, we consider the hard spheres kernel, which is appropriate for modelling interactions arising from localised interactions. For this model, we build on previous analyses of the same problem to show that the expected deviation between the Kac process and the Boltzmann …
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Computer simulation of rod-sphere mixtures.
… (LC) substance. Firstly, a bulk mixture of Hard Gaussian Overlap particles with an aspect ratio of 3:1 and hard spheres with diameters equal to the breadth of the rods is simulated at various sphere concentrations. Both mixing-demixing and isotropic-nematic transition are studied using Monte …
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The effects of surface functionalization on rheology, structure and transport properties of nanocomposites
… that is unlike what is universally seen for hard spheres. For the entangled melts, a yield stress is observed for the silanized particles that is absent in the case of the bare particles and there is a divergence in the elastic modulus in comparison to bare particles. We observe an anomalous …
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Optomechanical anisotropy in nanoengineered polymer photonic crystals
… self-assembly of 200nm monodisperse, polymer spheres with a core-shell structure. Determination of the assembly geometry through light diffraction experiments reveals a highly symmetric structure of close-packed, core-shell particles, with its orientation governed by the directionality imposed …
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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
… between particles. The effects of charged, hard spheres (silica nanoparticle) on the hydrodynamic drag force a particle experiences as it approaches a flat plate were measured experimentally using colloid probe atomic force microscopy (CP-AFM). Deviation was found between the measured drag …
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Soft Self-assembly and Densest Packings in Colloidal Models
… on a monolayer of magnetic and nonmagnetic spheres suspended in a thin layer of ferrofluid and exposed to a tun- able magnetic field. A theoretical model of hard spheres with point dipoles at their centers is used to guide the choice of experimental parameters and characterize the underlying …
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Translational Non-Equilibrium Effects in Reactive Dynamics of Detonations
… of non-equilibrium. A Navier-Stokes model with hard sphere transport properties effectively captures the acceleration process, indicating significant implications for modeling gaseous detonations with fast reactions and strongly coupled pressure wave dynamics and reactivity in the detonation …
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Time dependence of nonlinear flow dynamics of near hard sphere suspensions
The mechanical properties of near hard sphere suspensions are studied from low frequency to high frequency terminal regions as a function of frequency and strain. The volume fraction dependence of experimentally observable characteristic time scales are reported- the longest relaxation time and two …
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Modelling of colloidal dynamics in complex soft matter systems
… and it is able to recover previous results for hard-spheres fluids under semi-dilute conditions. The new framework has also unveiled a new rich physical behavior by studying the microstructure of two paradigmatic cases of physically relevant interactions, the attractive Lennard-Jones potential …
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Modeling and Experimental Measurement of Triboelectric Charging in Dielectric Granular Mixtures
… from a basic collision model for a mixture of hard spheres, we developed a robust semi-analytical model for making predictions about the charge distribution in a dielectric granular mixture. This model takes a set of assumptions about a mixture, including the continuous size distribution, …
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Microemulsion and macroemulsion behaviour of systems containing oil, water and nonionic surfactant
… in which microemulsions are assumed to behave as hard spheres and are excluded from the intervening region between approaching emulsion droplets.Microemulsion phase behaviour is also reported for oil phases containing different concentrations of medium and long chain length triglycerides (MCT, …
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Caging and Transport in Simple Disordered Systems
… a study on the three-dimensional polydisperse hard spheres with modification, named as the Mari-Kurchan-Krzakala (MKK) model was proposed. This consideration provides a controllable way to interpolate between the mean-field and the real space glasses. These insights help chart a path toward a …
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