Hydrodynamic Interactions Of Colloidal Particles In Confined Geometry
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Hydrodynamic Interactions Of Colloidal Particles In Confined Geometry
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Author : Sukalyan Bhattacharya
language : en
Publisher:
Release Date : 2005
Hydrodynamic Interactions Of Colloidal Particles In Confined Geometry written by Sukalyan Bhattacharya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Colloids In Confined Geometries Hydrodynamics Simulation And Rheology
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Author : James W. Swan
language : en
Publisher:
Release Date : 2010
Colloids In Confined Geometries Hydrodynamics Simulation And Rheology written by James W. Swan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Colloids categories.
The hydrodynamics of colloids in confined geometries is studied hierarchically beginning with the exact solutions for a spherical particle translating, rotating and deforming in the presence of a plane wall at low Reynolds number. The many-bodied hydrodynamic interactions among a collection of spherical particles near a plane wall are computed and used to study the Brownian motion of confined suspensions. The method of reflections is used to describe the motion of a single spherical particle embedded in the fluid constrained by two, parallel plane walls. From this, tables which are independent of the channel width are generated describing the particle's response to various force moments. This same approach is expanded to describe the hydrodynamic interactions among the particles comprising a colloidal dispersion confined in a channel. The simulations arising from this theory depict the short-time self-diffusivity, sedimentation rate and high frequency viscosity of suspensions of varying volume fractions in channels of varying widths. A theory for the scattering of evanescent waves by colloidal dispersions is developed and cast in the form of the diffusivity measured by classical light scattering. A series of simulations is conducted to predict the short- time self-diffusivity and the collective diffusivity measured by evanescent wave dynamic light scattering. The thesis concludes with a discussion of how the developed simulations and theories can be extended to make dynamic measurements as well as a brief consideration of some remaining, open questions.
Phase Behavior And Effective Interactions In Colloidal Suspensions
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Author :
language : en
Publisher: Cuvillier Verlag
Release Date : 2007-04-25
Phase Behavior And Effective Interactions In Colloidal Suspensions written by and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-04-25 with Science categories.
Colloidal suspensions describe particles with size from typically a few nanometers to a few microns which are dispersed in a medium. In physics, in chemistry, and in biology colloids play an important role and the study of colloidal systems underwent a recent renaissance. This is based on the development of experimental techniques, the availability of extensive computer simulations and well-developed theoretical approaches. From a technological point of view, the relevance of micro- and nanostructured materials and the presence of colloids in nature and everyday life motivates study of this rich field. In this thesis the phase behavior and the effective interactions of colloidal suspensions in bulk, in contact with surfaces, and in confined geometry are studied. For mixtures of particles with hard-core interactions the model introduced by Asakura, Oosawa and Vrij provides an appropriate starting-point. Based on that model the free-volume theory and the density functional theory are employed. In experimental systems one faces particles with properties such as the size or the shape which are described by a distribution. To capture that issue a generalized approach based on free-volume theory for treating mixtures of colloids and a polydisperse depletion agent is presented. Within that approach it is possible to treat size and morphology polydispersity. A depletion agent with a bimodal distribution possessing two length scales can be studied. Though the Asakura-Oosawa-Vrij model describes a simple fluid - a mixture of hard spheres and ideal polymer - the phenomenology is rather rich: in contact with a wall one finds layering and wetting effects and in confined geometry of a narrow pore one finds capillary condensation. The competition between both effects manifests itself in thermodynamic properties like the excess colloid adsorption and the solvation force between the two confining walls. Solvent phase separation complicates the evaluation of interparticle interactions between the solute particles. We address this question for the wall-colloid and the colloid-colloid geometry. For a non-spherical particle the effect of curvature on thermodynamic quantities is studied.
Interactions Between Colloidal Particles At Oil Water Interfaces
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Author : Bum Jun Park
language : en
Publisher: ProQuest
Release Date : 2008
Interactions Between Colloidal Particles At Oil Water Interfaces written by Bum Jun Park and has been published by ProQuest this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Colloids categories.
The behavior of colloidal particles at two-dimensional interfaces is of considerable interests in terms of industrial applications and model systems for research. To systematically study colloidal particle behaviors at 2D interfaces, we directly measure interaction forces between particle pairs, dynamics of a confined particle in a fixed geometry, and micromechanical properties of aggregates or percolated networks. For doing this, we use multiple time-shared optical traps which enable us to measure forces in the piconewton range (0.1-100 pN). First, the trapping forces for a single ray at the interface were calculated while varying the particle position at the 2D interfaces. The trapping force is described by the contributions of reflected and refracted rays with their corresponding powers, which are determined by Fresnel reflection and transmission coefficients. Based on the Ashkin's calculation in the 3D aqueous phase, we found that the trapping and scattering forces are mainly determined by the first reflection of the incident ray and the next three refractions to the medium. At 2D interfaces, the trapping force is considered for two geometries; (a) when the incident ray is incident on a particle in the aqueous phase, (b) when a transmitted ray at the liquid interface enters into a particle in the oil phase. In the first geometry, the trapping forces do not change, regardless of the refraction orders if the second refracted ray is to the oil phase. The dimensionless factors Q g and Q s of the gradient force and the scattering force decrease compared to those in the 3D aqueous space, and Q s decreases more than Q g . This suggests that the presence of the interface provides good trapping conditions. In the second geometry, the magnitude of dimensionless factors is consistent with those calculated in the first geometry when the incident angle is in the range of 0
Particles At Fluid Interfaces And Membranes
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Author : P. Kralchevsky
language : en
Publisher: Elsevier
Release Date : 2001-01-22
Particles At Fluid Interfaces And Membranes written by P. Kralchevsky and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-01-22 with Science categories.
In the small world of micrometer to nanometer scale many natural and industrial processes include attachment of colloid particles (solid spheres, liquid droplets, gas bubbles or protein macromolecules) to fluid interfaces and their confinement in liquid films. This may lead to the appearance of lateral interactions between particles at interfaces, or between inclusions in phospholipid membranes, followed eventually by the formation of two-dimensional ordered arrays. The book is devoted to the description of such processes, their consecutive stages, and to the investigation of the underlying physico-chemical mechanisms. The first six chapters give a concise but informative introduction to the basic knowledge in surface and colloid science, which includes both traditional concepts and some recent results. Chapters 1 and 2 are devoted to the basic theory of capillarity, kinetics of surfactant adsorption, shapes of axisymmetric fluid interfaces, contact angles and line tension. Chapters 3 and 4 present a generalization of the theory of capillarity to the case, in which the variation of the interfacial (membrane) curvature contributes to the total energy of the system. The generalized Laplace equation is applied to determine the configurations of free and adherent biological cells. Chapters 5 and 6 are focused on the role of thin liquid films and hydrodynamic factors in the attachment of solid and fluid particles to an interface. Surface forces of various physical nature are presented and their relative importance is discussed. Hydrodynamic interactions of a colloidal particle with an interface (or another particle) are also considered.Chapters 7 to 10 are devoted to the theoretical foundation of various kinds of capillary forces. When two particles are attached to the same interface (membrane), capillary interactions, mediated by the interface or membrane, appear between them. Two major kinds of capillary interactions are described: (i) capillary immersion force related to the surface wettability (Chapter 7), (ii) capillary flotation force originating from interfacial deformations due to particle weight (Chapter 8). Special attention is paid to the theory of capillary immersion forces between particles entrapped in spherical liquid films (Chapter 9). A generalization of the theory of immersion forces allows one to describe membrane-mediated interactions between protein inclusions into a lipid bilayer (Chapter 10).Chapter 11 is devoted to the theory of the capillary bridges and the capillary-bridge forces, whose importance has been recognized in phenomena like consolidation of granules and soils, wetting of powders, capillary condensation, long-range hydrophobic attraction, etc. The nucleation of capillary bridges is also examined.Chapter 12 considers solid particles, which have an irregular wetting perimeter upon attachment to a fluid interface. The undulated contact line induces interfacial deformations, which engender a special lateral capillary force between the particles. The latter contributes to the dilatational and shear elastic moduli of particulate adsorption monolayers.Chapter 13 describes how lateral capillary forces, facilitated by convective flows and some specific and non-specific interactions, can lead to the aggregation and ordering of various particles at fluid interfaces or in thin liquid films. Recent results on fabricating two-dimensional (2D) arrays from micrometer and sub-micrometer latex particles, as well as 2D crystals from proteins and protein complexes, are reviewed. Chapter 14 presents applied aspects of the particle-surface interaction in antifoaming and defoaming. The mechanisms of antifoaming action involve as a necessary step the entering of an antifoam particle at the air-water interface. The considered mechanisms indicate the factors for control of foaminess.
Structure Formation Of Charged Colloidal Particles In Confined Geometry
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Author :
language : en
Publisher:
Release Date : 2012
Structure Formation Of Charged Colloidal Particles In Confined Geometry written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Spherically Confined Colloidal Suspensions Of Hydrodynamically Interacting Particles
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Author : Christian Alberto Aponte Rivera
language : en
Publisher:
Release Date : 2017
Spherically Confined Colloidal Suspensions Of Hydrodynamically Interacting Particles written by Christian Alberto Aponte Rivera and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The diffusion in and rheology of hydrodynamically interacting colloids confined by a spherical cavity via dynamic simulation is studied as a model for intracellular and other confined biophysical transport. The modeling of transport and rheology in such confined inhomogeneous soft materials requires an accurate description of the microscopic forces driving particle motion, such as entropic and hydrodynamic forces, and of particle interactions with nearby boundaries. Previous models of such micro-confined transport behavior had been limited primarily to a single particle inside a spherical cavity. Although attempts had been made prior to this work to extend such models to more than one confined particle, none had yet successfully accounted for the effects of hydrodynamics, owing to the difficulties of modeling many-body long-ranged interactions. To accurately model spherically confined suspensions, new far-field mobility functions are derived and, together with the appropriate near-field resistance functions, implemented in a Stokesian-dynamics like approach. The method fully accounts for all many-body far-field interactions and near-field interactions both between the particles themselves and between particles and the enclosing cavity. Utilizing the newly developed method, we study short- and long- time self-diffusion at equilibrium, with a focus on the dependence of the former on particle positions relative to the cavity, and of both on volume fraction and size ratio. It is found that the cavity exerts qualitative changes in transport behavior, such as a position dependent and anisotropic short-time self-diffusivity and anisotropic long-time transport behavior. Such qualitative changes suggest that careful interpretation of experimental measurements in 3D confined suspensions requires accounting for such confinement induced behaviors. To elucidate the effects of confinement on inter-particle hydrodynamic interactions, the method is utilized to determine the concentrated mobility of particles in the spherically confined domain. Confinement is found to induce qualitative changes in the functional dependence of particle entrainment with inter-particle separation. For widely separated particles, the functional dependence on inter-particle separation can be predicted via a Green's function. How this behavior can be utilized to develop a more accurate framework for two-point microrheology measurements near confining boundaries is discussed.
Effect Of Brownian Forces And Hydrodynamic Interactions On Colloids In Confined Flows
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Author : Jimaan Sané
language : en
Publisher:
Release Date : 2009
Effect Of Brownian Forces And Hydrodynamic Interactions On Colloids In Confined Flows written by Jimaan Sané and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Solutions Of Exercises In An Introduction To Dynamics Of Colloids
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Author : Jan K. G. Dhont
language : en
Publisher: Forschungszentrum Jülich
Release Date : 2013
Solutions Of Exercises In An Introduction To Dynamics Of Colloids written by Jan K. G. Dhont and has been published by Forschungszentrum Jülich this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Simulation Of Colloidal Suspension Systems
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Author : Hongfei Fang
language : en
Publisher:
Release Date : 2010
Simulation Of Colloidal Suspension Systems written by Hongfei Fang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The research work is focused on the development of a simulation platform for colloidal suspension. Based on discrete element method (DEM), the model developed takes into account the crucial interactions, i.e. the electrostatic repulsion, van der Waals attraction, Brownian force, hydration effects and hydrodynamic force. The mechanism of colloid particle diffusion in confined space and the combined influences of fluid flow field, geometrical confinement, and the interparticle interactions on the self-assembly process are investigated.