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Development Of A Model Colloidal System For Rheology Simulation
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Book Synopsis Development of a Model Colloidal System for Rheology Simulation by :
Download or read book Development of a Model Colloidal System for Rheology Simulation written by and published by . This book was released on 2008 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the experimental effort is to provide a model particle system that will enable modeling of the macroscopic rheology from the interfacial and environmental structure of the particles and solvent or melt as functions of applied shear and volume fraction of the solid particles. This chapter describes the choice of the model particle system, methods for synthesis and characterization, and results from characterization of colloidal dispersion, particle film formation, and the shear and oscillatory rheology in the system. Surface characterization of the grafted PDMS interface, dispersion characterization of the colloids, and rheological characterization of the dispersions as a function of volume fraction were conducted.
Book Synopsis Colloidal Suspension Rheology by : Jan Mewis
Download or read book Colloidal Suspension Rheology written by Jan Mewis and published by Cambridge University Press. This book was released on 2012 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented in an accessible and introductory manner, this is the first book devoted to the comprehensive study of colloidal suspensions.
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.
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 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential text on practical application, theory and simulation, written by an international coalition of experts in the field and edited by the authors of Colloidal Suspension Rheology. This up-to-date work builds upon the prior work as a valuable guide to formulation and processing, as well as fundamental rheology of colloidal suspensions. Thematically, theory and simulation are connected to industrial application by consideration of colloidal interactions, particle properties, and suspension microstructure. Important classes of model suspensions including gels, glasses and soft particles are covered so as to develop a deeper understanding of industrial systems ranging from carbon black slurries, paints and coatings, asphalt, cement, and mine tailings, to natural suspensions such as biocolloids, protein solutions, and blood. Systematically presenting the established facts in this multidisciplinary field, this book is the perfect aid for academic researchers, graduate students, and industrial practitioners alike.
Book Synopsis Accelerated Lattice Boltzmann Model for Colloidal Suspensions by : Hassan Farhat
Download or read book Accelerated Lattice Boltzmann Model for Colloidal Suspensions written by Hassan Farhat and published by Springer Science & Business Media. This book was released on 2014-04-12 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloids are ubiquitous in the food, medical, cosmetics, polymers, water purification, and pharmaceutical industries. The thermal, mechanical, and storage properties of colloids are highly dependent on their interface morphology and their rheological behavior. Numerical methods provide a convenient and reliable tool for the study of colloids. Accelerated Lattice Boltzmann Model for Colloidal Suspensions introduce the main building-blocks for an improved lattice Boltzmann–based numerical tool designed for the study of colloidal rheology and interface morphology. This book also covers the migrating multi-block used to simulate single component, multi-component, multiphase, and single component multiphase flows and their validation by experimental, numerical, and analytical solutions. Among other topics discussed are the hybrid lattice Boltzmann method (LBM) for surfactant-covered droplets; biological suspensions such as blood; used in conjunction with the suppression of coalescence for investigating the rheology of colloids and microvasculature blood flow. The presented LBM model provides a flexible numerical platform consisting of various modules that could be used separately or in combination for the study of a variety of colloids and biological flow deformation problems.
Book Synopsis Micromechanics and Rheology of Colloidal Gels Via Dynamic Simulation by : Lilian Challingsworth Johnson
Download or read book Micromechanics and Rheology of Colloidal Gels Via Dynamic Simulation written by Lilian Challingsworth Johnson and published by . This book was released on 2018 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal gels are soft solids comprising a viscoelastic, networked structure embedded in solvent. This network forms from microscopically small particles initially dispersed in a solvent which self-assemble into a hierarchical, space-spanning network of particles connected by physical bonds. When subjected to external forces, colloidal gels exhibit a solid-to-liquid transition yet regain elastic character when forcing is removed. Their tunable mechanical properties and ability to flow enable colloidal gels to serve as the foundation of a multitude of applications ranging from everyday products, like yogurt, to biomedical applications, such as injectable therapeutics. The nonlinear rheology of colloidal gels underlies their utility in nearly every application, for example, spreading, injecting, or pouring. The transition from rest to steady flow of colloidal gels is characterized by one or more stress overshoots indicative of gel yield. In strongly-bonded, dilute colloidal gels, yield is hypothesized to result from the catastrophic loss of the network structure. Solid-like fracture leading to fluidization of strongly bonded gels may not be relevant where particle strands are not single-particle thick chains but rather bicontinuous and time-evolving due to reversible bonds. The connections between gel yield and the structural evolution of dense, bicontinuous gels remains poorly understood due to the difficulty of imaging of the internal structure of dense particulate gels with sufficient time resolution in experiments and due to the large system size required in computational studies. Here we report large-scale dynamic simulation to study reversible colloidal gels to elucidate the micromechanical underpinnings of non-Newtonian behavior of soft materials and to understand ongoing phase separation. First, we show that the startup of a fixed strain rate reveals that colloidal gel yield, separating the short-time solid-like response from the long-time liquid-like response, can be framed as a transition in energy storage. Contrary to prior hypotheses connecting yield to loss of network connectivity, the network persists after flow startup and a predictive model connecting hierarchical structure to early-time stress growth is presented. We devised a novel approach to monitor bond stretching, compression, formation, and loss alongside macroscopic deformation. We find that changes in structure that underlie the stress growth and post-yield relaxation, as monitored by bond dynamics, indicate the switch from energy storage to release. After rheological yield, energy release continues if flow is sufficiently strong; however, when imposed flow is weak, energy release reverses after yield, and the gel densifies. This gives the important result that yield under weak flow can be viewed as a release from kinetic arrest, permitting the gel to evolve toward more complete phase separation. This supports our view that yield of weakly sheared gels is a `non-equilibrium phase transition'. Second, we compare our simulations to experimental measurements of colloidal gel rheology to study the influence of bond strength, volume fraction, and network morphology on the viscoelastic moduli. Strong agreement is found between linear viscoelasticity from sim...
Book Synopsis Computer Simulation Studies of Dense Suspension Rheology by : A. J. Hopkins
Download or read book Computer Simulation Studies of Dense Suspension Rheology written by A. J. Hopkins and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics, Rheology and Critical Properties of Colloidal Fluid Mixtures by : Jochen Zausch
Download or read book Dynamics, Rheology and Critical Properties of Colloidal Fluid Mixtures written by Jochen Zausch and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2009-05 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquids under the influence of external fields exhibit a wide range of intriguing phenomena that can be markedly different from the behaviour of a quiescent system. This work considers two different systems - a glassforming Yukawa system and a colloid-polymer mixture - by Molecular Dynamics computer simulations. The former consists of a 50-50 binary mixture of differently-sized, like-charged colloids interacting via a screened Coulomb (Yukawa) potential. Near the glass transition the influence of an external shear field is studied. In particular, the transition from elastic response to plastic flow is of interest. The obtained results are important for advancing new theoretical approaches in the framework of the mode-coupling theory of the glass transition. Furthermore, they suggest new experimental investigations on colloidal systems. As second system a colloid-polymer mixture is studied in the context of its behaviour near the critical point of phase separation. Based on the Asakura-Oosawa model a new effective model with soft interaction potentials is introduced and characterised in equilibrium. Finally its suitability for shear simulations is shown.
Book Synopsis Speciality Chemicals in Mineral Processing by : David R Skuse
Download or read book Speciality Chemicals in Mineral Processing written by David R Skuse and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely publication will be welcomed by those needing access to the latest research in the profitable field of industrial mineral process chemistry. It is an up-to-date account of the performance gains achievable in the use of speciality chemicals in industrial mineral processing and products, with each chapter presenting the new and potentially valuable technology for consideration. This book presents the most recent research in this key area and is unique in its coverage. Diverse topics such as dispersants, dewatering and flocculants, are discussed, along with selective processing and biocides. Speciality Chemicals in Mineral Processing is an essential purchase for speciality chemical producers and users, particularly those in the paper, plastic, polymer, paint, rubber, adhesive and ceramic industries.
Download or read book Soft Materials written by John R. Dutcher and published by CRC Press. This book was released on 2004-10-01 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Representing the wide breadth academic disciplines involved in this ever-expanding area of research, this reference provides a comprehensive overview of current scientific and technological advancements in soft materials analysis and application. Documenting new and emerging challenges in this burgeoning field, Soft Materials is a unique and outsta
Book Synopsis Colloids in Confined Geometries: Hydrodynamics, Simulation and Rheology by : James W. Swan
Download or read book Colloids in Confined Geometries: Hydrodynamics, Simulation and Rheology written by James W. Swan and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Colloidal Dynamics Simulations of Rheology and Stability of Concentrated Fuel Slurries by : Gerald Wilemski
Download or read book Colloidal Dynamics Simulations of Rheology and Stability of Concentrated Fuel Slurries written by Gerald Wilemski and published by . This book was released on 1987 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of a Phase I SBIR project to calculate properties of concentrated colloidal suspensions using computer simulation methods. Equilibrium and nonequilibrium Brownian dynamics (NEBD) simulations were performed for concentrated aqueous and nonaqueous colloidal suspensions. These are the first calculations of suspension shear viscosity based on NEBD simulations. Stability estimates were also made for sterically stabilized nonaqueous suspensions. The NEBD calculations provide quantitative evidence for the disturbance of the equilibrium structure of the dispersions by shearing. Shear viscosities have been calculated as a function of shear rate and particle volume fraction. Good agreement was obtained with experimental viscosities for comparable systems. The simulation results are sensitive to the type, strength and range of the potential interactions used to describe the dispersion. These results demonstrate that the NEBD technique is capable of describing the essential features of sheared suspension behavior. They also establish the feasibility and desirability of using NEBD simulation methods as a predictive engineering tool for the design of slurries. Keywords: Colloidal dynamics, Rheology, Fuel slurries, Computer simulation.
Book Synopsis Structure and Functional Properties of Colloidal Systems by : Roque Hidalgo-Alvarez
Download or read book Structure and Functional Properties of Colloidal Systems written by Roque Hidalgo-Alvarez and published by CRC Press. This book was released on 2009-11-18 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating fundamental research with the technical applications of this rapidly evolving field, Structure and Functional Properties of Colloidal Systems clearly presents the connections between structure and functional aspects in colloid and interface science. It explores the physical fundamentals of colloid science, new developments of synthesis
Author :Phillip R. Westmoreland Publisher :Springer Science & Business Media ISBN 13 :9401707650 Total Pages :596 pages Book Rating :4.4/5 (17 download)
Book Synopsis Applying Molecular and Materials Modeling by : Phillip R. Westmoreland
Download or read book Applying Molecular and Materials Modeling written by Phillip R. Westmoreland and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational molecular and materials modeling has emerged to deliver solid technological impacts in the chemical, pharmaceutical, and materials industries. It is not the all-predictive science fiction that discouraged early adopters in the 1980s. Rather, it is proving a valuable aid to designing and developing new products and processes. People create, not computers, and these tools give them qualitative relations and quantitative properties that they need to make creative decisions. With detailed analysis and examples from around the world, Applying Molecular and Materials Modeling describes the science, applications, and infrastructures that have proven successful. Computational quantum chemistry, molecular simulations, informatics, desktop graphics, and high-performance computing all play important roles. At the same time, the best technology requires the right practitioners, the right organizational structures, and - most of all - a clearly understood blend of imagination and realism that propels technological advances. This book is itself a powerful tool to help scientists, engineers, and managers understand and take advantage of these advances.
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.
Book Synopsis Low-shear Rheology and Delayed Sedimentation of Model Colloidal Systems by : S. P. Meeker
Download or read book Low-shear Rheology and Delayed Sedimentation of Model Colloidal Systems written by S. P. Meeker and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Dynamics of Colloidal Systems by : William B. Russel
Download or read book The Dynamics of Colloidal Systems written by William B. Russel and published by . This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
