Download or read book Rheology of Weakly Attractive Soft Particles written by Ehsan Irani and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the rheology of a soft particulate system with attractive interactions. Lees-Edwards boundary conditions are used to simulate a shear-controlled flow. Unlike repulsive systems, it is found that in systems with a damping force directed normally to the contact point, attractive interactions result in a finite yield stress, and an iso-static structure emerges below the jamming point. The rheology can be explained by a scaling argument that exploits the vicinity to the isostatic state. In addition, flow curves exhibit non-monotonic behavior, resulting in persistent shear-banding in lar...
Download or read book On the Rheology of Dense Pastes of Soft Particles written by Jyoti Ravishanker Seth and published by . This book was released on 2008 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many concentrated paste-like materials are composed of deformable particles randomly packed into a dense suspension. Examples of the constituent soft particles include polyelectrolyte microgels, emulsion droplets, polymer coated colloids, and star polymers. These materials share in common many properties such as yield stress, shear thinning, non-zero normal stresses, wall-slip, shear-banding, memory and aging (similar to that in structural, spin and polymer glasses). Their unique properties make soft particle pastes (SPPs) scientifically interesting and extremely useful in industrial applications (as rheological modifiers). In this dissertation particle simulations, theoretical models and experiments are used to study the flow dynamics and rheological behavior of SPPs near confining surfaces - wall-slip and shear flow, and in the bulk - elasticity at small stresses and the non-linear shear rheology. In the study of slip near smooth surfaces, rheological measurements are shown that identify the influence of the chemical nature of the shearing boundary on slip at the shearing boundary. A modified elastohydrodynamic model is presented that incorporates attractive and repulsive short range interactions between the paste particles and captures the corresponding suppression and promotion of slip at the wall. Further, fluorescence microscopy and particle tracking velocimetry is used to visualize slip and flow of pastes near smooth boundaries and study the sensitivity of the bulk flow profile to the nature of the shearing surface. In the study of elastic properties of pastes, SPPs are modeled as three-dimensional systems of randomly packed elastic spheres. Simulations are performed wherein the packing is subject to small deformations to compute the high- and low-frequency shear moduli. The simulation results are compared with the data from experiments on microgel pastes. This model is extended to study paste dynamics under simple shear with added pairwise elastohydrodynamic lubrication interactions between the densely packed soft particles. The shear and normal stress differences generated during simple hear flow are calculated that compare well with the experimental data. In addition, the pair distribution function of the initial isotropic configuration, the elastically deformed and the steady sheared configurations is investigated. A semi-empirical analysis of the microstructure and its evolution due to shearing is presented.
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.
Download or read book Solid Liquid Two Phase Flow written by Sümer M. Peker and published by Elsevier. This book was released on 2011-04-18 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an undertaking of a pioneering work of uniting three vast fields of interfacial phenomena, rheology and fluid mechanics within the framework of solid-liquid two phase flow. No wonder, much finer books will be written in the future as the visionary aims of many nations in combining molecular chemistry, biology, transport and interfacial phenomena for the fundamental understanding of processes and capabilities of new materials will be achieved. Solid-liquid systems where solid particles with a wide range of physical properties, sizes ranging from nano- to macro- scale and concentrations varying from very dilute to highly concentrated, are suspended in liquids of different rheological behavior flowing in various regimes are taken up in this book. Interactions among solid particles in molecular scale are extended to aggregations in the macro scale and related to settling, flow and rheological behavior of the suspensions in a coherent, sequential manner. The classical concept of solid particles is extended to include nanoparticles, colloids, microorganisms and cellular materials. The flow of these systems is investigated under pressure, electrical, magnetic and chemical driving forces in channels ranging from macro-scale pipes to micro channels. Complementary separation and mixing processes are also taken under consideration with micro- and macro-scale counterparts. - Up-to-date including emerging technologies- Coherent, sequential approach- Wide scope: microorganisms, nanoparticles, polymer solutions, minerals, wastewater sludge, etc- All flow conditions, settling and non-settling particles, non-Newtonian flow, etc- Processes accompanying conveying in channels, such as sedimentation, separation, mixing
Download or read book Non local Rheology of Soft Glassy Materials written by Vincent Mansard and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft glassy materials (concentrated emulsion, foams, concentrated suspension...) present rheological properties between solids and liquid. Under small stress they stay elastic but at stress higher than a yield stress they begin to flow as a liquid. Those fluids are used in cosmetics, food industry or building materials as concrete. The yield stress behavior only appears when the volume fraction is high enough, where the particles are blocked by their neighbors. So the systems cannot relax and the flow become highly cooperative.This cooperativity impacts the rheology at small scale. When the confinement is of the order of few particles, the viscosity does not only depend on the local stress as usually but also on the stress in the neighborhood. This is called non-local rheology.I studied experimentally this behavior by flowing concentrated emulsion in a microchannel and observing directly the flow of the droplet with a confocal microscopy. The results from these microfluidics experiments are compared to predictions of the Kinetic Elasto Plastic model of Bocquet et al. 2009 and molecular dynamic simulation of jammed soft particles.
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.
Download or read book Product Design and Engineering written by Ulrich Bröckel and published by John Wiley & Sons. This book was released on 2013-08-02 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the whole value chain - from product requirements and properties via process technologies and equipment to real-world applications - this reference represents a comprehensive overview of the topic. The editors and majority of the authors are members of the European Federation of Chemical Engineering, with backgrounds from academia as well as industry. Therefore, this multifaceted area is highlighted from different angles: essential physico-chemical background, latest measurement and prediction techniques, and numerous applications from cosmetic up to food industry. Recommended reading for process, pharma and chemical engineers, chemists in industry, and those working in the pharmaceutical, food, cosmetics, dyes and pigments industries.
Download or read book Experimental and Computational Techniques in Soft Condensed Matter Physics written by Jeffrey Olafsen and published by Cambridge University Press. This book was released on 2010-09-02 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft condensed matter physics relies on a fundamental understanding at the interface between physics, chemistry, biology, and engineering for a host of materials and circumstances that are related to, but outside, the traditional definition of condensed matter physics. Featuring contributions from leading researchers in the field, this book uniquely discusses both the contemporary experimental and computational manifestations of soft condensed matter systems. From particle tracking and image analysis, novel materials and computational methods, to confocal microscopy and bacterial assays, this book will equip the reader for collaborative and interdisciplinary research efforts relating to a range of modern problems in nonlinear and non-equilibrium systems. It will enable both graduate students and experienced researchers to supplement a more traditional understanding of thermodynamics and statistical systems with knowledge of the techniques used in contemporary investigations. Color versions of a selection of the figures are available at www.cambridge.org/9780521115902.
Download or read book Rheometry of Pastes Suspensions and Granular Materials written by Philippe Coussot and published by John Wiley & Sons. This book was released on 2005-06-14 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive examination of rheometry theory and its practical applications This publication enables readers to understand and characterize the flow properties of complex fluids and, with this knowledge, develop a wide range of industrial and consumer products. The author fills a gap in the current literature by presenting a comprehensive description of the rheological behavior of pastes, suspensions, and granular materials and by offering readers the rheometrical techniques needed to effectively characterize these materials. With his extensive experience in both academic and industrial research, the author is able to take the field to a new level in: * General schematic classification of the behavior of pastes,suspensions, and granular materials * Systematic review, analysis, and quantification of experimental problems with complex fluids * Insight into the flow behavior of complex fluids gained through the most recent discoveries and research techniques * Comprehensive rheometrical analysis of data obtained from research across a broad range of industries In addition to gaining a thorough understanding of the theory underlining rheometry, readers discover its many practical applications. Throughout the publication, specific examples are provided that illustrate how theory is applied, including examples involving food, civil engineering, cosmetics, pharmaceuticals, paper coatings, paint and ink, ceramics, sewage sludges, granular materials, and natural materials. In summary, this publication provides a comprehensive review of the behavior of pastes, suspensions, and granular materials as well as detailed analysis of rheometrical techniques. Everything needed to determine the behavior and movement of complex fluids is provided. It is, therefore, a recommended resource for rheologists, engineers, and researchers, as well as students who deal with complex fluids in product formulation, quality and process control, and process plant design.
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.
Download or read book Rheology and Wall Slip of Soft Particle Glasses written by Tianfei Liu and published by . This book was released on 2021 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft particle glasses (SPGs) are highly concentrated suspensions of deformable particles above random close-packing for hard spheres. SPGs have wide applications in many areas including tissue engineering, drug delivery, etc. Three aspects of SPGs are studied in this dissertation. Minimal interparticle interactions are identified as necessary for a particle dynamics simulation to predict the structure and flow behavior of soft particle glasses. Generally, two kinds of forces between the particles must be accounted for in simulations of SPGs: far field drag forces are required to dissipate energy in the simulations, and elastic forces are found to be dominant compared to near field frictional forces. The shear stress, the first and second normal stress differences for different interparticle force laws collapse onto universal master curves of the Herschel–Bulkley form by non-dimensionalization. The behavior of the storage and loss moduli for jammed SPGs is studied computationally for a variety of interparticle potentials and volume fractions. The qualitative behavior of the storage modulus is independent of the nature of the interparticle potential. The storage modulus follows a universal sigmoidal curve for non-dimensionalized values of the frequency. The qualitative nature of the loss modulus depends on the nature of the near-field drag force between the soft particles. At moderate to high frequency, the loss modulus increases with the frequency according to a power law whose exponent is related to the drag force law. Wall slip is an important aspect since it is an inseparable part of characterizing and processing SPG materials. Two simulation frameworks are built to serve as tools to understand, explore and investigate the wall slip process. Both frameworks work for shear between rough-rough walls, with matching results from bulk rheology, which proves their validity. One framework works for shear between rough-smooth walls, with fixing randomly selected particles on the smooth wall, which sheds light on the linear regime between slip velocity and slip stress. 15 percent of stuck particles on the smooth wall would have a similar no-slip effect as a rough wall. The inclusion of elastohydrodynamic forces and stuck particles reduces the slip velocity given the same slip stress
Download or read book The Rheology and Microstructure of Dense Bimodal Mixtures of Colloidal Particles with Long range Soft Interactions written by William John Hunt and published by . This book was released on 1997 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Third European Rheology Conference and Golden Jubilee Meeting of the British Society of Rheology written by D.R. Oliver and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microgel Suspensions written by Alberto Fernandez-Nieves and published by John Wiley & Sons. This book was released on 2011-01-11 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a vital link between chemistry and physics on the nanoscale, this book offers concise coverage of the entire topic in five major sections, beginning with synthesis of microgel particles and continuing with their physical properties. The phase behavior and dynamics of resulting microgel suspensions feature in the third section, followed by their mechanical properties. It concludes with detailed accounts of numerous industrial, commercial and medical applications. Edited by David Weitz, Professor at Harvard and one of the world's pre-eminent experts in the field.
Download or read book Soft Glassy Rheology and Structure of Colloidal Gels written by Guangjun Yin and published by . This book was released on 2006 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Solid Dispersions written by Michel Cloitre and published by Springer Science & Business Media. This book was released on 2010-10-28 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Polymers to Colloids: Engineering the Dynamic Properties of Hairy Particles, by D. Vlassopoulos and G. Fytas * Nonlinear Rheological Properties of Dense Colloidal Dispersions Close to a Glass Transition Under Steady Shear, by M. Fuchs * Micromechanics of Soft Particle Glasses, by R. T. Bonnecaze and M. Cloitre * Quantitative Imaging of Concentrated Suspensions Under Flow, by L. Isa, R. Besseling, A. B. Schofield and W. C. K. Poon * Soft and Wet Materials: From Hydrogels to Biotissues, by J. P. Gong and Y. Osada
Download or read book Magnetorheology written by Norman Wereley and published by Royal Society of Chemistry. This book was released on 2014 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading experts provide a timely overview of the key developments in the physics, chemistry and uses of magnetorheological fluids.
