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Author: Eko Hari Purnomo
Publisher:
ISBN: 9789036526944
Category :
Languages : en
Pages : 117
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Book Description
Author: Eko Hari Purnomo
Publisher:
ISBN: 9789036526944
Category :
Languages : en
Pages : 117
Get Book Here
Book Description
Author: Eko Purnomo
Publisher: LAP Lambert Academic Publishing
ISBN: 9783847306207
Category :
Languages : en
Pages : 132
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Book Description
Soft glassy materials are widely used in our daily life. Macroscopically, soft glassy materials behave like a solid but they have an amorphous structure just like a liquid. Due to their metastability and arrested structure, this class of materials often exhibits aging i.e. their mechanical properties evolve continuously with time. The unique property of the our model system (thermosensitive particle) is that we can control its volume fraction via the temperature. Aging in soft glassy materials inherently affects their rheological properties and also affects the displacements of probe particles embedded in the systems. We find that they depend strongly on their age. We use the soft glassy rheology (SGR) model to quantitatively describe the rheological moduli. We also find that this soft colloidal system can be tuned reversibly between the glass at low temperatures and the liquid state at high temperatures. The volume fraction at which the glass transition occurs approaches the one of hard sphere particles as the particles get harder (i.e. more elastic). We also find an indication that aging stops after a certain time if we approach the hard sphere limit with our particle softness.
Author: Tienchai Tonthai
Publisher:
ISBN:
Category :
Languages : en
Pages : 518
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Book Description
Author: Norman J. Wagner
Publisher: Cambridge University Press
ISBN: 1108423035
Category : Science
Languages : en
Pages : 437
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Book Description
Essential text on the practical application and theory of colloidal suspension rheology, written by an international coalition of experts.
Author: Jason P. Rich
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Book Description
Understanding the ways that matter deforms and flows, which is the focus of the branch of science known as rheology, is essential for the efficient processing and proper function of such practically and technologically important materials as plastics, paints, oil-drilling fluids, and consumer products. Rheology is also powerful from a scientific perspective because of the correlation between rheological properties and the structure and behavior of matter on microscopic and molecular scales. The developing sub-field of microrheology, which explicitly examines flow and deformation behavior on microscopic length scales, provides additional clarity to this connection between rheology and microstructure. Aging materials, whose rheological properties evolve over time, are one class of materials that are of significant scientific and practical interest for their rheological behavior. Also, the unique field-responsive rheological properties of magnetorheological (MR) suspensions, which can be tuned with an applied magnetic field, have been used to create active vibration damping systems in such diverse applications as seismic vibration control and prosthetics. A material that undergoes rheological aging and that has received much attention from soft matter researchers is the synthetic clay Laponite® . This material is attractive as a rheological modifier in industrial applications and consumer products because a rich array of rheological properties, including a yield stress, viscoelasticity, and a shear-thinning viscosity, can be achieved at very low concentrations in aqueous dispersions (~ 1 w%). Though this behavior has been investigated extensively using traditional 'bulk' rheology, a number of important questions remain regarding the nature of the dispersion microstructure. The techniques of microrheology, in which rheological properties are extracted from the motion of embedded microscopic probe particles, could help to elucidate the connection between microstructure and rheology in this material. Microrheological studies can be performed using passive techniques, in which probes are subject only to thermal motion, and active techniques, in which external forces are applied to probes. Because aqueous Laponite® dispersions exhibit a significant yield stress, they could be beneficial as novel matrix fluids for magnetorheological suspensions. MR fluids consist of a suspension of microscopic magnetizable particles in a non-magnetic matrix fluid. When an external magnetic field is applied, the particles attract each other and align in domain-spanning chains of particles, resulting in significant and reversible changes in rheological properties. Because of the typically large density difference between the matrix fluid and the suspended magnetic particles, however, sedimentation is often problematic in MR fluids. A yield stress matrix fluid such as an aqueous Laponite® dispersion could help address this issue. In this thesis, bulk rheology and microrheology experiments are combined in order to provide a thorough characterization of the rheological properties of aqueous Laponite® dispersions. Multiple Particle Tracking (MPT), a passive microrheology technique, is used to explore the gelation properties of dilute dispersions, while an active magnetic tweezer microrheology technique is used to examine the yield stress and shear-thinning behavior in more concentrated dispersions. MPT results show strong probe-size dependence of the gelation time and the viscoelastic moduli, implying that the microstructure is heterogeneous across different length scales. We also demonstrate the first use of magnetic tweezers to measure yield stresses at the microscopic scale, and show that yield stress values determined from bulk and micro-scale measurements are in quantitative agreement in more concentrated Laponite® dispersions. With a thorough understanding of the clay rheology, we study the magnetorheology of MR suspensions in a yield stress matrix fluid composed of an aqueous Laponite® dispersion. Sedimentation of magnetic particles is prevented essentially indefinitely, and for sufficient magnetic field strengths and particle concentrations the matrix fluid yield stress has negligible effect on the magnetorheology. Using particle-level simulations, we characterize the ability of the matrix fluid yield stress to arrest the growth of magnetized particle chains. The methods and results presented in this thesis will contribute to the fundamental understanding of the rheology and microstructure of aqueous Laponite® dispersions and provide researchers with new techniques for investigating complex fluids on microscopic length scales. Additionally, our characterization of the effects of a matrix fluid yield stress on magnetorheological properties will aid formulators of MR fluids in achieving gravitationally stable field-responsive suspensions, and provide a new method for manipulating the assembly of particle building blocks into functional structures.
Author: Jan Mewis
Publisher: Cambridge University Press
ISBN: 0521515998
Category : Science
Languages : en
Pages : 417
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Book Description
Presented in an accessible and introductory manner, this is the first book devoted to the comprehensive study of colloidal suspensions.
Author: Hyun-Ok Park
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Secondly, the stability and rheology of the single walled carbon nanotube (SWNT) suspensions prepared by interfacial trapping method is examined and compared to a conventional method of ultracentrifugation. Since the rheological properties are sensitive to the suspension microstructure, the change of rheological properties, such as viscosity, can be employed as a systematic standard of stability. The steady shear viscosities have been measured and compared as a function of shear rate and aging time of the suspension. Also, the visual states of the suspension have been observed. The rheology of the SWNT suspensions depends on the preparation of surfactant solution. Also, the interfacial trapping method generated similar behaviors to the SWNT suspension prepared by the ultracentrifugation method. Finally, the dynamics of non-colloidal spheres in oscillatory shear flow is studied by experiment and simulation. Two distinct scales are observed for the development of the rheology in time. At small total strains, a rapid decay of ... is observed, while ... and ... remain constant. However, the evolution of the complex viscosity is observed over large total strains, indicating microstructural changes over long times. Also, this suspension system shows a non-monotonic dependence of viscosity on strain amplitude. Stokesian dynamics simulations are used to correlate the rheology and microstructures.
Author: Francisco Chinesta
Publisher: Elsevier
ISBN: 0081008120
Category : Science
Languages : en
Pages : 398
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Book Description
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
Author: Philippe Coussot
Publisher: John Wiley & Sons
ISBN: 0471720569
Category : Technology & Engineering
Languages : en
Pages : 311
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Book Description
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.
Author: Guillaume Ovarlez
Publisher: Springer
ISBN: 3319894382
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
The book is designed for advanced graduate students as well as postdoctoral researchers across several disciplines (e.g., mathematics, physics and engineering), as it provides them with tools and techniques that are essential in performing research on the flow problems of visco-plastic fluids. The following topics are treated: analysis of classical visco-plastic fluid models mathematical modeling of flows of visco-plastic fluids computing flows of visco-plastic fluids rheology of visco-plastic fluids and visco-plastic suspensions application of visco-plastic fluids in engineering sciences complex flows of visco-plastic fluids.
