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Showing 1 to 20 of 70 for “"colloidal suspensions"”.
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Thermophoresis in Colloidal Suspensions
… theory of non-equilibrium thermodynamics. The colloidal flux is split up into an interfacial single-colloid contribution and a bulk contribution, followed by a determination of transport coefficients based on Onsager’s reciprocal relations. It is further shown how the phenomenological …
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Confined Flow of Attractive Colloidal Suspensions
… While the flow properties of hard-sphere suspensions in micro-scale geometries have been studied extensively, the effects of interparticle attractions and particle size dispersity on the confined flow properties of particulate suspensions are not well understood. We used confocal …
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Kinetics of Crystallization and Gelation in Colloidal Suspensions
… between crystallization and gelation in colloidal suspensions is addressed as arising from three underlying processes at the particle level, viz., aggregation, dissociation, and rearrangement. Particles aggregate via Brownian encounters into clusters that have open structures. …
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Destabilization - Aggregation of Dilute Colloidal Suspensions by Polyelectrolytes
Made available in DSpace on 2014-12-08T23:57:07Z (GMT). No. of bitstreams: 1 6901367.pdf: 4933082 bytes, checksum: 40d7bcab944a80514e5f9d6b2a907b32 (MD5) Previous issue date: 1968
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Shear behavior and microstructures of confined colloidal suspensions
… of concentrated charge-stabilized suspensions confined to gap sizes on the order of a few particle diameters are investigated by molecular dynamics computer simulations. Suspensions of uniform spheres at volume fractions ranging from 0.28 to 0.53 covering the crystalline phase are …
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Structural properties and phase behavior in colloidal suspensions
… my research on the effective interactions of colloidal particles induced by a smaller species, as well as the structure of colloidal particles undergoing freeze casting. In this research I have used a wide variety of computational techniques in order to understand these systems. Specifically, …
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Diffusiophoresis and Auto Stratification in Rapidly Drying Colloidal Suspensions
… under non-equilibrium conditions, polydisperse colloidal suspensions exhibit interesting auto-stratification phenomena during rapid drying, where particles of different sizes segregate into layered structures. The physical mechanism responsible for these phenomena is believed to be …
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Collective behavior of colloidal suspensions under electric fields and confinement
… focus on the dynamics and collective behavior of colloidal suspensions of spherical particles under electric fields and confinement. We first analyze the nonlinear dynamics of non-colloidal, uncharged ideally polarizable spheres freely suspended in a viscous electrolyte in a uniform electric …
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Accelerated Lattice Boltzmann Method For Colloidal Suspensions Rheology And Interface Morphology
… <p>ACCELERATED LATTICE BOLTZMANN MODEL FOR COLLOIDAL SUSPENSIONS RHEOLOGY AND INTERFACE MORPHOLOGY</p> <p> by</p> <p> HASSAN FARHAT</p> <p> July 2010</p> <p>Advisor: Dr. Singh Trilochan</p> <p>Co-Advisor: Dr. Joon Sang Lee</p> <p>Major: Mechanical Engineering</p> <p>Degree: Doctor of …
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Structure and Property Evolution During Film Formation From Binary Colloidal Suspensions
… stress of layers cast from alumina:latex suspensions. Their maximum drying stress increased with decreasing Al2O 3 particle size, whereas their residual stress increased with increasing latex Tg. Our observations provide guidelines for the design of ceramic suspensions composed of …
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Detailed Studies of Drying and Crack Formation in Aggregated Colloidal Suspensions
… role in the cumulative drying behavior of suspensions of aggregated colloidal particles. In particular, they control the shape and deformation behavior during drying of these suspensions. We identify a single dimensionless group Q¯ that can be used to predict drying behavior. We use a …
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On the dynamics and interparticle forces of electrostatically stabilized colloidal suspensions
… the equilibrium and dynamic properties of colloidal suspensions play a pivotal role, with systems ranging from simple gold nanoparticles in electrolyte solutions to complex assemblies like micelles, vesicles, nanocapsules, and dendritic polymers. Typically, these systems are approached …
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Structure, slow dynamics, kinetic arrest, and massively reconfigurable assembly in colloidal suspensions
Colloidal suspensions offer the level of control necessary to assemble and form novel equilibrium, and non-equilibrium states. The realm of colloidal suspensions is vast and ripe with opportunities for synthesizing new materials possessing superlative physical characteristics. In this thesis we …
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Theories of slow dynamics: from glassy colloidal suspensions to entangled macromolecular liquids
… The first part of this thesis treats suspensions of hard-sphere colloids --- the theorist's idealization of a dense liquid --- by connecting two-point equilibrium structure with the emergence of glassy dynamics. An earlier single-particle theory is qualitatively extended to study the …
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Phase transitions in soft matter: From colloidal suspensions to biomolecular condensate regulation
… can dictate the nucleation behaviour of these colloidal systems. Continuing with different colloidal systems, we investigate the crystallization of oppositely charged colloids, where multiple polymorphs compete in the nucleation and crystal growth stages. By analyzing phase diagrams, nucleation …
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A Numerical Model for Flux Decline During the Crossflow Ultrafiltration of Colloidal Suspensions
… filtration of monodisperse polystyrene latex suspensions ranging from 0.064 to 2.16 $\mu$m in diameter was studied under constant transmembrane pressure mode. Besides the crossflow filtration tests, dead-end filtration tests were also carried out to independently determine a model parameter, …
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Theory of Slow Dynamics and Barrier Hopping in Colloidal Suspensions and Polymer Melts
The theory is extended to polymer melts based on a coarse-grained model in which the melt is treated as a liquid of segments. The barrier is predicted to be a function of a single parameter that is chemical structure, temperature and pressure dependent. Qualitative agreement with experiment is …
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The role of quenched disorder, interfaces and confinement on the glassy dynamics of colloidal suspensions, thermal liquids and films
… the slow activated glassy dynamics of colloidal and thermal (molecular, metallic, polymer) fluids in the presence of quenched disorder, interfaces and/or confinement is of fundamental science importance and relevant for materials applications. My overarching goal is to construct new, …
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Structure, Dynamics, and Flow Behavior of Model Biphasic Colloidal Mixtures
… have important implications on the design of colloidal suspensions for myriad applications including ceramic components, novel coatings, inks for direct-write assembly, and drug delivery.
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Hydration forces between inorganic particles: Crystallization of silicotungstic acid
The ubiquitous nature of colloidal suspensions in nature and industrial products has warranted much effort in understanding their stability and phase transition from a colloid-poor to a colloid-rich phase. At small particle separations in certain systems, stability is found where classical colloid …
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