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 57 for “"Hard-sphere"”.
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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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The Surface Charge of Soft and Hard Sphere Colloidal Particles - Experimental Investigation and Comparison to Theory
The focus of this thesis was aimed at the investigation of colloidal particle stability. In a first step we established a method to assess the repulsive interaction energy of dispersed colloids based on the measurement of the rate of slow coagulation with light scattering. Due to an energy …
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Analytical Perturbed Hard Sphere Models Based on Solubility and Volumetric Studies of Organic Solids Interacting With Supercritical Fluids
… data were well correlated by perturbed hard sphere equations of state in a new way that does not require the use of critical properties, which are often unavailable, and if available, difficult to apply to these highly asymmetric systems. The crucial unlike pair energy parameter …
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Relationships between electron transport and redox center concentrations within molecular networks
… that are based on a random walk, and includes a hard-sphere approximation for the redox molecules, the electronic structure of redox centers, and intervening matrix effects. In dilute systems, $D\sb E$ rises sharply with redox center concentration, $C$; however at large C's, the hard sphere $D\sb …
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Studies of kinetic glass transition in a triblock copolymer micellar system
… ergodic to nonergodic state of matters. In a hard-sphere system, mode coupling theory (MCT) predicts occurrence of a glass transition when the volume fraction exceeds a certain value due to the excluded volume effect. However, Recent MCT calculations for a hard-sphere system with a short-range …
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Efficient simulation of molecular gas transport for micro- and nanoscale applications
… is able to simulate the more general variable-hard-sphere collision model, which more accurately captures the viscosity dependence on the temperature of real gases, compared to the hard sphere and Bhatnagar-Gross-Krook collision models developed previously. The present formulation uses …
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Colloidal phoretic motion
… diffusion, excluded volume diffusiophoresis, hard sphere and Derjaguin–Landau–Verwey–Overbeek (DLVO) interactions in a drying film. Excluded volume diffusiophoresis is found to act to promote small-on-top stratification, causing fluxes of a similar magnitude to diffusion. The hard sphere …
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An Investigation of Protein Interactions and the Relationship to Phase Behavior
… to describe protein interactions. The adhesive hard sphere model demonstrates protein interactions at crystallization conditions are short range. However, the adhesive hard sphere model provides an incomplete description of protein interactions. Further analysis suggests the attractive Yukawa …
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Large Scale Simulations of Particulate Systems Using the PME Method
… the sedimentation and rheology of concentrated hard-sphere suspensions.
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Computer simulation studies of dense suspension rheology. Computational studies of model sheared fluids; elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by Non-Equilibrium Particulate Dynamics.
… simplest idealised model suspension; i.e. the hard-sphere model in Newtonian media and its relationship to the isokinetic flow curves obtained through non-equilibrium molecular dynamics (NEMD) simulations; (iv) to preliminarily determine the effect of perturbations present in all real colloidal …
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Molecular dynamics modeling of normal shock waves in monatomic and polyatomic gas mixtures.
… agreement between MD and DSMC using Generalized Hard Sphere (GHS).
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Self-Consistent Phonon Theory of Aperiodic Solids and Density Functional Theories of Freezing and Vitrification
… thermodynamic properties and fluctuations of the hard sphere crystal to an amorphous lattice. In doing so, we develop a theory of lattice vibrations in amorphous materials via a perturbation theory around the Einstein oscillator approximation. This development is analogous to the mean spherical …
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Single particle motion of polymeric, colloidal, and biological materials
… homogeneous (though optically anisotropic) hard-sphere colloids. Using these spheres, we explored the comparatively underdeveloped conjunction of translation and rotation and particle hydrodynamics. Developing off this, the dynamics of clusters of spherical colloids were investigated, …
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Multilevel Monte Carlo simulation of soft matter using coarse-grained models
… mixtures, a size-asymmetric binary hard-sphere mixture and the Asakura-Oosawa model. Using a two-level method, we demonstrate the first numerical evidence of a fluid-fluid phase separation in the binary hard-sphere mixture. Second, we develop a proof-of-concept multilevel algorithm …
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Multiple Light Scattering from Isotropic and Anosotropic Turbid Media
… square displacement, (∆r2(τ)), of particles in hard-sphere suspensions during the first twenty nanoseconds of their motion. These are the shortest time scales ever probed in the study of Brownian dynamics.
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On the Kirkwood superposition approximation
… has been investigated, and results for a hard-sphere model show that this method gives considerably less reliable results than those obtained by simply using the superposition approximation in the first- order Born-Green equation. A second approach, due to Ryuzo Abe, based on an expansion …
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Assessment of high-fidelity collision models in the direct simulation Monte Carlo method
… events per hour were simulated using a simple hard sphere model. Today, more than 10 billion collision events can be simulated per hour for the same problem. Many new and more physically realistic collision models such as the Lennard-Jones potential and the forced harmonic oscillator model have …
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Wetting Phenomena Near the Melting Curve
A study of the location of the hard sphere crystal-fluid phase transition and equilibrium wetting states for systems in contact with various hard substrates was undertaken using Monte Carlo (MC) and molecular dynamics (MD) techniques. Through the use of MD the phase transition was found to occur at …
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Hydrodynamic Simulations of Colloidal Gels: Microstructure, Dynamics, and Rheology
… is the temperature, and a is the colloid radius. Hard-sphere thermodynamic perturbation theory is employed to predict equilibrium behavior. A new algorithm called Fast Lubrication Dynamics (FLD) is developed as part of this work and enables dynamic simulations including the effects of many-body …
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Impurities in a Bose-Einstein condensate using quantum Monte-Carlo methods: ground-state properties.
… The interactions between bosons are modeled by a hard sphere potential with scattering length a, whereas the interactions between the impurity and the bosons are modeled by a short-range, square-well potential where both the sign and the strength of the scattering length b can be varied by …
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