The Rheology Of Polydisperse Colloidal Suspensions In Spherical Confinement

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The Rheology of Polydisperse Colloidal Suspensions in Spherical Confinement

Author : Emma del Carmen Gonzalez Gonzalez
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (128 download)

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Book Synopsis The Rheology of Polydisperse Colloidal Suspensions in Spherical Confinement by : Emma del Carmen Gonzalez Gonzalez

Download or read book The Rheology of Polydisperse Colloidal Suspensions in Spherical Confinement written by Emma del Carmen Gonzalez Gonzalez and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we present a computational study of the rheology and dynamics of spherically-confined polydisperse suspensions of hydrodynamically interacting colloids, a simple model system that provides an important framework for studying the behavior of living and non-living confined colloidal suspensions. Colloids are microscopically small particles suspended in a solvent. Examples include the cytoplasm of biological cells, micro-reactor vesicles, and particle-laden droplets ubiquitous in additive manufacturing and industrial coatings. Here we present an extension of the Confined Stokesian Dynamics algorithm (CSD) capable of modeling the bulk rheology of confined colloidal suspensions of arbitrary particle-size distribution, at and away from equilibrium. We will present novel hydrodynamic functions we developed that couple particle dynamics to suspension properties and, after a brief overview of the CSD algorithm, the results of a systematic study of the impact of changes in confinement and size polydispersity on equilibrium structure and dynamics. We showed that an interplay between polydispersity and confinement reveals demixing and localized dynamics that help explain our previous discovery that such dynamics control the speedup of protein synthesis in faster-growing bacteria. Next, we will present a new theoretical framework we developed for measuring the intrinsic viscosity and osmotic pressure in confined suspensions. The first significant outcome of this work was that tighter confinement and crowding significantly increase equilibrium viscous dissipation and osmotic pressure compared to unconfined suspensions. This result is important for the rational design of biochemical tests, where up to now, only the effect of passive crowders was taken into account. The second significant outcome of this work was the modeling of strong departures from equilibrium, including a representation of biomolecules localized at one pole of the cavity that subsequently diffuse - mimicking the Min cycle in E. coli our work shows that concentration gradients inside cells increase the residence time of proteins close to the membrane, which is beneficial for Min-protein membrane reaction kinetics that promotes correct cell division. Finally, we will present three other significant theoretical developments in the field of microhydrodynamics done in service of the underlying theoretical framework of our model.

Theory and Applications of Colloidal Suspension Rheology

Author : Norman J. Wagner
Publisher : Cambridge University Press
ISBN 13 : 1108423035
Total Pages : 437 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Theory and Applications of Colloidal Suspension Rheology by : Norman J. Wagner

Download or read book Theory and Applications of Colloidal Suspension Rheology written by Norman J. Wagner and published by Cambridge University Press. This book was released on 2021-04-15 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essential text on the practical application and theory of colloidal suspension rheology, written by an international coalition of experts.

Spherically Confined Colloidal Suspensions of Hydrodynamically Interacting Particles

Author : Christian Alberto Aponte Rivera
Publisher :
ISBN 13 :
Total Pages : 488 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Spherically Confined Colloidal Suspensions of Hydrodynamically Interacting Particles by : Christian Alberto Aponte Rivera

Download or read book Spherically Confined Colloidal Suspensions of Hydrodynamically Interacting Particles written by Christian Alberto Aponte Rivera and published by . This book was released on 2017 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Confined Flow of Attractive Colloidal Suspensions

Author : Rahul Pandey
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Confined Flow of Attractive Colloidal Suspensions by : Rahul Pandey

Download or read book Confined Flow of Attractive Colloidal Suspensions written by Rahul Pandey and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Attractive particulate fluids flowing through complex confined geometries are frequently used in technological applications. 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 microscopy, particle tracking, and bulk rheology to study the confined structure, dynamics, and flow properties of colloid-polymer mixtures, which serve as simple models of attractive particulate suspensions. We employed poly(methyl-methacrylate) spheres that were suspended in a refractive-index and density- matched solvent, and induced a controlled short-range depletion attraction between particles by adding non-absorbing linear polystyrene. First, we investigated the effects of particle size dispersity on confinement-induced solidification of colloid-polymer mixtures. We formulated mixtures of polymer and bidispersed colloids with particle size ratio aS/aL ≈ 0.49 at a constant total volume fraction fT and measured the dynamics of the large particles as a function of the volume fraction of large particles. The dynamics of large particles became slower as the volume fraction of large particles r=fL/fT was decreased or the confinement thickness was decreased, indicating increasingly solid-like behavior. Second, we investigated the effects of variation in particle size dispersity r on the rheology and microstructure of mixtures of polymer and bidispersed colloids. Significant changes in rheology and microstructure were observed only at high volume fractions of large particles. By contrast, dense suspensions fT = 0.40 were strong gels at all concentration of large particles and exhibited only modest rheological and microstructural changes. Finally, we investigated the effects of variation in interparticle attractions on the microchannel flow of colloid-polymer mixtures. In suspensions with weak interparticle attractions, the number density of particles increased downstream in the channel due to shear-induced migration and consolidation by compression. In suspensions with stronger interparticle attractions, an interconnected network of particles suppressed these mechanisms and prevented the increase in density downstream. Together, our results indicate that the confined structure, dynamics, and flow properties of attractive colloidal suspensions can be controllably tuned from fluid-like to solid-like by varying the interparticle attractions and the particle size dispersity.

Effect of Particle Shape on the Structure and Rheology of Colloidal Suspensions and Gels

Author : Ali Mohraz
Publisher :
ISBN 13 :
Total Pages : 444 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Effect of Particle Shape on the Structure and Rheology of Colloidal Suspensions and Gels by : Ali Mohraz

Download or read book Effect of Particle Shape on the Structure and Rheology of Colloidal Suspensions and Gels written by Ali Mohraz and published by . This book was released on 2004 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Phase Behavior and Effective Interactions in Colloidal Suspensions

Author :
Publisher : Cuvillier Verlag
ISBN 13 : 373692223X
Total Pages : 136 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Phase Behavior and Effective Interactions in Colloidal Suspensions by :

Download or read book Phase Behavior and Effective Interactions in Colloidal Suspensions written by and published by Cuvillier Verlag. This book was released on 2007-04-25 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Rheology of Non-spherical Particle Suspensions

Author : Francisco Chinesta
Publisher : Elsevier
ISBN 13 : 0081008120
Total Pages : 398 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Rheology of Non-spherical Particle Suspensions by : Francisco Chinesta

Download or read book Rheology of Non-spherical Particle Suspensions written by Francisco Chinesta and published by Elsevier. This book was released on 2015-10-06 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a review of the current understanding of the behavior of non-spherical particle suspensions providing experimental results, rheological models and numerical modeling. In recent years, new models have been developed for suspension rheology and as a result applications for nanocomposites have increased. The authors tackle issues within experimental, model and numerical simulations of the behavior of particle suspensions. Applications of non-spherical particle suspension rheology are widespread and can be found in organic matrix composites, nanocomposites, biocomposites, fiber-filled fresh concrete flow, blood and biologic fluids. Understand how to model and predict the final microstructure and properties of particle suspensions Explores nano, micro, meso and macro scales Rheology, thermomechanical and electromagnetic physics are discussed

Dynamics of Blood Cell Suspensions in Microflows

Author : Annie Viallat
Publisher : CRC Press
ISBN 13 : 1315395126
Total Pages : 476 pages
Book Rating : 4.3/5 (153 download)

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Book Synopsis Dynamics of Blood Cell Suspensions in Microflows by : Annie Viallat

Download or read book Dynamics of Blood Cell Suspensions in Microflows written by Annie Viallat and published by CRC Press. This book was released on 2019-12-09 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blood microcirculation is essential to our bodies for the successful supply of nutrients, waste removal, oxygen delivery, homeostasis, controlling temperature, wound healing, and active immune surveillance. This book provides a physical introduction to the subject and explores how researchers can successfully describe, understand, and predict behaviours of blood flow and blood cells that are directly linked to these important physiological functions. Using practical examples, this book explains how the key concepts of physics are related to blood microcirculation and underlie the dynamic behavior of red blood cells, leukocytes, and platelets. This interdisciplinary book will be a valuable reference for researchers and graduate students in biomechanics, fluid mechanics, biomedical engineering, biological physics, and medicine. Features: The first book to provide a physical perspective of blood microcirculation Draws attention to the potential of this physical approach for novel applications in medicine Edited by specialists in this field, with chapter contributions from subject area specialists

Microstructure and Rheology of Concentrated Suspensions of Near Hard-sphere Colloids

Author : Dennis P. Kalman
Publisher :
ISBN 13 : 9781124240909
Total Pages : pages
Book Rating : 4.2/5 (49 download)

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Book Synopsis Microstructure and Rheology of Concentrated Suspensions of Near Hard-sphere Colloids by : Dennis P. Kalman

Download or read book Microstructure and Rheology of Concentrated Suspensions of Near Hard-sphere Colloids written by Dennis P. Kalman and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The relationship between colloidal suspension microstructure and rheology is investigated to provide a solid understanding of the nonlinear rheology of concentrated suspensions, with a focus on shear thickening. These suspensions are also studied as a treatment to woven fabric in body-armor applications, where the insight from microstructural measurements is used to attempt to improve the application. The colloid and suspension properties are characterized via SEM, DLS, SANS, USANS, and rheometry. The rheology is mapped onto an effective hard-sphere model with the addition of a yield stress. An additional excluded volume shell, as measured by SANS and USANS structural measurements, accounts for interparticle interactions due to surface forces arising from the stabilizing layer on the particles. The microstructure of these near hard-sphere concentrated, shear-thickening colloidal dispersions are measured via SANS and USANS as a function of volume fraction, shear rate, and particle size. Special Rheo-SANS, flow-SANS, and flow-USANS instruments are developed and validated to measure microstructure in flowing systems. Structures measured via USANS show a cluster peak that arises from hydrocluster formation in concentrated, shear thickening suspensions. Structure measurements in SANS via 1-d averaged analysis and analysis of the 2-d structure corresponds to that expected from Stokesian Dynamics simulations. Micromechanics theory via a Stress-SANS law is used to calculate rheology from the microstructure for comparison. As the rheology calculated from the SANS data qualitatively agrees with that of the suspension and the structures seen correspond to those expected from simulations, strong confirmation of the hydrocluster mechanism for shear thickening is observed. This improved knowledge of the hydrocluster structure is used to develop an elastohydrodynamic theory for the limiting viscosity at high shear stresses due to particle deformations in the hydrocluster. Measurements of particle modulus give consistent application of this elastohydrodynamic model to suspensions studied in this thesis. In addition, the model is applied to widely varying suspensions, including those of hard mineral particles, polymer particles, microgels, and emulsions and consistent results are seen. The results of these fundamental studies of how particle size, concentration, and hardness affect suspension microstructure and rheology are used to engineer shear thickening fluid treated textiles, suitable for various types of protective devices.

Journal of Rheology

Author :
Publisher :
ISBN 13 :
Total Pages : 758 pages
Book Rating : 4.6/5 (254 download)

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Book Synopsis Journal of Rheology by :

Download or read book Journal of Rheology written by and published by . This book was released on 2004 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts from the Journal of the Society of Rheology, Japan.

Rheology of a Concentrated Hard-sphere Colloidal Suspension

Author : Myoungbae Lee
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (241 download)

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Book Synopsis Rheology of a Concentrated Hard-sphere Colloidal Suspension by : Myoungbae Lee

Download or read book Rheology of a Concentrated Hard-sphere Colloidal Suspension written by Myoungbae Lee and published by . This book was released on 2008 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Diffusion, Rheology and Polydispersity Effects in Three-dimensional and (quasi)-two-dimensional Colloids

Author : Adolfo Javier Banchio
Publisher :
ISBN 13 : 9783896494696
Total Pages : 172 pages
Book Rating : 4.4/5 (946 download)

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Book Synopsis Diffusion, Rheology and Polydispersity Effects in Three-dimensional and (quasi)-two-dimensional Colloids by : Adolfo Javier Banchio

Download or read book Diffusion, Rheology and Polydispersity Effects in Three-dimensional and (quasi)-two-dimensional Colloids written by Adolfo Javier Banchio and published by . This book was released on 1999 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Rheology of Bimodal Suspensions of Hydrodynamically Interacting Spherical Particles

Author : Chingyi Chang
Publisher :
ISBN 13 :
Total Pages : 558 pages
Book Rating : 4.:/5 (5 download)

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Book Synopsis The Rheology of Bimodal Suspensions of Hydrodynamically Interacting Spherical Particles by : Chingyi Chang

Download or read book The Rheology of Bimodal Suspensions of Hydrodynamically Interacting Spherical Particles written by Chingyi Chang and published by . This book was released on 1993 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Rheology of Concentrated Polymer Colloidal Suspensions

Author : Babak Kaffashi
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (374 download)

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Book Synopsis The Rheology of Concentrated Polymer Colloidal Suspensions by : Babak Kaffashi

Download or read book The Rheology of Concentrated Polymer Colloidal Suspensions written by Babak Kaffashi and published by . This book was released on 1994 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Crystallisation of Polydisperse Hard-sphere Colloidal Systems

Author : Stephen Martin
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (224 download)

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Book Synopsis Crystallisation of Polydisperse Hard-sphere Colloidal Systems by : Stephen Martin

Download or read book Crystallisation of Polydisperse Hard-sphere Colloidal Systems written by Stephen Martin and published by . This book was released on 2002 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Rheology of Colloidal Suspensions

Author : Safa Jamali
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (93 download)

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Book Synopsis Rheology of Colloidal Suspensions by : Safa Jamali

Download or read book Rheology of Colloidal Suspensions written by Safa Jamali and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational studies have emerged as a key class of scientific approached to solving different problems of interest in the past few decades. Dissipative Particle Dynamics, DPD, a mesoscale simulation technique based on Molecular Dynamics has been established as a powerful technique in recovering a wide range of physical and chemical processes. Nevertheless, absence of robust bridge between the computational parameters to the physical characteristics of a system has limited applications of DPD. Thus in the second chapter of this dissertation (after a brief introduction and organizational guideline in chapter 1) a systematic study will be presented, providing several routes for setting the simulation parameters based on the real experimental measures. Although computational and theoretical works have always been a crucial areas of research in the rheology society, DPD has not been employed in rheological studies. This is mainly due to the fact that a step-by-step guideline does not exist for rheological measurements in DPD. Another reason for this lack of success in rheological community is that the built-in thermostat in DPD is not capable of providing a stable control over the thermodynamics of the system under flow conditions. Thus, firstly in chapter 3 different methods of viscosity measurement and rheological studies will be discussed in detail, and consequently in chapter 4 a novel thermostat is presented to modify the natural shortcomings of DPD under flow. For decades now, scientists across different disciplines have attempted at identifying the nature of versatile rheological response of colloidal suspensions. Exhibiting Newtonian behavior at very low, shear-thinning at intermediate, and shear-thickening at high flow rates in dense colloidal suspensions exemplifies a broad range of rheological regimes within a simple solid-liquid system. Despite numerous experimental and computational efforts in explaining the underlying mechanism of these behavior, there is still an ongoing debate in the scientific community on the subject. Hence, in final chapter a comprehensive study on rheology of colloidal suspensions (including a complete flow curve, normal stress measurements and microstructural evolutions) is presented, based on the results and foundations in prior chapters as well as in the literature.

Ionic Liquids

Author : Mark B. Shiflett
Publisher : ACS Symposium
ISBN 13 : 9780841232136
Total Pages : 326 pages
Book Rating : 4.2/5 (321 download)

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Book Synopsis Ionic Liquids by : Mark B. Shiflett

Download or read book Ionic Liquids written by Mark B. Shiflett and published by ACS Symposium. This book was released on 2018-07-02 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to provide an update on some of the latest research and applications in the broad field of ionic liquids. This volume spans research and development activities ranging from fundamental and experimental investigations to commercial applications. A brief history of the field is included, as well as both new developments and reviews organized in the general topical areas of applications, materials, biomass processing, and fundamental studies. This book attempts to propel the field forward by bringing together contributions from some of the foremost researchers on ionic liquids. Recent products and new large-scale processes using ionic liquids, both in operation and being announced, indicate that an exciting new chapter in this field is about to begin. The authors summarize some of the history, applications, conferences, books, databases, issues related to data quality and toxicity for researchers working in the field of ionic liquids and includes an overview for each proceeding chapter with an introduction about the authors.