The Experts below are selected from a list of 133068 Experts worldwide ranked by ideXlab platform
Venkat Ganesan - One of the best experts on this subject based on the ideXlab platform.
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Mechanisms of steady-shear Rheology in polymer-nanoparticle composites
Journal of Rheology, 2006Co-Authors: Victor Pryamitsyn, Venkat GanesanAbstract:We use coarse-grained computer simulations to delineate the mechanisms governing the steady-shear Rheology of polymer-nanoparticle composites. Our studies specifically focus on the regimes where the particle sizes and the interparticle distances become comparable to the polymer sizes and where the interactions between polymer and particles become relevant in influencing the dynamical characteristics. Our results suggest the shear Rheology of the composite is very similar to that of colloidal suspensions in a simple fluid when polymer Rheology, the particle-induced changes in the polymer Rheology and the polymer slip effects are accounted. At dilute and semidilute nanoparticle concentrations, the composite shear Rheology is shown to be dominated by the shear thinning of the polymer chains which in turn is modified by the presence of the particles. For higher particle loads, the polymeric contribution to the Rheology becomes much less important and the shear Rheology is dominated by the particles stresses. ...
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Mechanisms of steady-shear Rheology in polymer-nanoparticle composites
Journal of Rheology, 2006Co-Authors: Victor Pryamitsyn, Venkat GanesanAbstract:Synopsis We use coarse-grained computer simulations to delineate the mechanisms governing the steady-shear Rheology of polymer-nanoparticle composites. Our studies specifically focus on the regimes where the particle sizes and the interparticle distances become comparable to the polymer sizes and where the interactions between polymer and particles become relevant in influencing the dynamical characteristics. Our results suggest the shear Rheology of the composite is very similar to that of colloidal suspensions in a simple fluid when polymer Rheology, the particle-induced changes in the polymer Rheology and the polymer slip effects are accounted. At dilute and semidilute nanoparticle concentrations, the composite shear Rheology is shown to be dominated by the shear thinning of the polymer chains which in turn is modified by the presence of the particles. For higher particle loads, the polymeric contribution to the Rheology becomes much less important and the shear Rheology is dominated by the particles stresses. Using our results we suggest how a simple empirical model can be constructed for the shear Rheology of the composite over the entire range of volume fractions. Our results and mechanistic explanations are in very good agreement with associated experimental observations.
Taghi Miri - One of the best experts on this subject based on the ideXlab platform.
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Viscosity and Oscillatory Rheology
Practical Food Rheology: An Interpretive Approach, 2010Co-Authors: Taghi MiriAbstract:This chapter contains sections titled: * Introduction * Food Rheology * Directions of rheological research * Steady-state shear flow behaviour: viscosity * Viscoelasticity and oscillation * Process, Rheology and microstructural interactions * Rheology of soft solids * Measuring instruments – practical aspects * References
Tharwat F. Tadros - One of the best experts on this subject based on the ideXlab platform.
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Colloids in Paints
Colloids in Paints, 2011Co-Authors: Tharwat F. TadrosAbstract:Front Matter -- Colloids in Paints -- Emulsion, Dispersion and Suspension Polymerization: Preparation of Polymer Colloids and their Stabilization -- Pigment Dispersion -- Colloid Stabilization of Paint Dispersions -- Particle Deposition and Adhesion -- Basic Principles of Rheology -- Rheology of Suspensions, Emulsions and their Mixtures (Suspoemulsions) -- Rheology Modifiers, Thickeners and Gels -- Rheology of Paints -- Index.
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Rheology of Dispersions: Principles and Applications
Rheology of Dispersions: Principles and Applications, 2010Co-Authors: Tharwat F. TadrosAbstract:A dispersion is a system of unmixable phases in which one phase is continuous and at least one is finely distributed. Examples are found in many industrial applications, including emulsions, suspensions, foams, and geld. The control of their flow characteristics - Rheology - is essential in their preparation, long-term physical stability and application.Filling the need for a practical, up-to-date book connecting the stability/instability of the dispersion to its rheological behavior, this title aids in understanding the principles of Rheology and the techniques that can be applied.From the contents:* General Introduction* Interparticle Interactions and Their Combination* Principles of Viscoelastic Behavior* Rheology of Suspensions* Rheology of Emulsions* Rheology of Modifiers, Thickeners, and Gels* Use of Rheological Measurements for Assessment and Prediction of the Long-Term Physical Stability of Formulations (Creaming and Sedimentation)
Victor Pryamitsyn - One of the best experts on this subject based on the ideXlab platform.
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Mechanisms of steady-shear Rheology in polymer-nanoparticle composites
Journal of Rheology, 2006Co-Authors: Victor Pryamitsyn, Venkat GanesanAbstract:We use coarse-grained computer simulations to delineate the mechanisms governing the steady-shear Rheology of polymer-nanoparticle composites. Our studies specifically focus on the regimes where the particle sizes and the interparticle distances become comparable to the polymer sizes and where the interactions between polymer and particles become relevant in influencing the dynamical characteristics. Our results suggest the shear Rheology of the composite is very similar to that of colloidal suspensions in a simple fluid when polymer Rheology, the particle-induced changes in the polymer Rheology and the polymer slip effects are accounted. At dilute and semidilute nanoparticle concentrations, the composite shear Rheology is shown to be dominated by the shear thinning of the polymer chains which in turn is modified by the presence of the particles. For higher particle loads, the polymeric contribution to the Rheology becomes much less important and the shear Rheology is dominated by the particles stresses. ...
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Mechanisms of steady-shear Rheology in polymer-nanoparticle composites
Journal of Rheology, 2006Co-Authors: Victor Pryamitsyn, Venkat GanesanAbstract:Synopsis We use coarse-grained computer simulations to delineate the mechanisms governing the steady-shear Rheology of polymer-nanoparticle composites. Our studies specifically focus on the regimes where the particle sizes and the interparticle distances become comparable to the polymer sizes and where the interactions between polymer and particles become relevant in influencing the dynamical characteristics. Our results suggest the shear Rheology of the composite is very similar to that of colloidal suspensions in a simple fluid when polymer Rheology, the particle-induced changes in the polymer Rheology and the polymer slip effects are accounted. At dilute and semidilute nanoparticle concentrations, the composite shear Rheology is shown to be dominated by the shear thinning of the polymer chains which in turn is modified by the presence of the particles. For higher particle loads, the polymeric contribution to the Rheology becomes much less important and the shear Rheology is dominated by the particles stresses. Using our results we suggest how a simple empirical model can be constructed for the shear Rheology of the composite over the entire range of volume fractions. Our results and mechanistic explanations are in very good agreement with associated experimental observations.
Brent S Murray - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Rheology of mixed food protein and surfactant adsorption layers with respect to emulsion and foam stability
Studies in Interface Science, 2007Co-Authors: Brent S MurrayAbstract:Publisher Summary Interfacial theology is the study of the relationship between interfacial stress and the resultant deformation of the interface. Areas where interfacial Rheology is important are very diverse, including for example, drug delivery, lung function and anaesthesia, as well as in typical food emulsions, foams, and solid particle dispersions. The principal food colloids of commercial interest are emulsions and foams. Low-molecular-weight surfactants in foods may be natural components, such as phospholipids, glycerides, fatty acids or synthetic molecules such as the Spans and Tweens. Low molecular-weight surfactants may adsorb strongly or weakly depending on the chemical structure of the surfactant. Because of the higher molecular weight of proteins and the co-operative nature of their adsorption, protein adsorption and desorption tend to be considerably slower than adsorption and desorption of low-molecular-weight surfactants. Most food systems contain mixtures of both proteins and low-molecular-weight surfactants so the competitive adsorption, and any factors that influence it, are of great significance in resolving the relationship between interfacial Rheology and the stability of emulsions and foams.
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interfacial Rheology of food emulsifiers and proteins
Current Opinion in Colloid and Interface Science, 2002Co-Authors: Brent S MurrayAbstract:Abstract The scientific literature from 1997 (inclusive) to the present on the interfacial Rheology of emulsifiers and proteins of relevance to food has been reviewed. Both shear and dilatational Rheology of oil–water and air–water interfaces have been covered and the main factors affecting interfacial Rheology have been tabulated. Special attention is paid to: the sensitivity of interfacial Rheology to film composition and structure; the growing viewpoint of treating proteins films as a two-dimensional gel state; recent theoretical modelling of interfacial rheological effects; those few publications that attempt to relate interfacial Rheology to bulk stability. It is concluded that there have been few major advances in the last 4 or 5 years, but the heterogeneity of such adsorbed films seems to be better recognised, both spatially and rheologically, with the challenge remaining to connect this picture to the stability of the corresponding bulk systems.
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Interfacial Rheology of food emulsifiers and proteins
Current Opinion in Colloid and Interface Science, 2002Co-Authors: Brent S MurrayAbstract:The scientific literature from 1997 (inclusive) to the present on the interfacial Rheology of emulsifiers and proteins of relevance to food has been reviewed. Both shear and dilatational Rheology of oil-water interfaces have been covered and the main factors affecting interfacial Rheology have been tabulated. Special attention is paid to: the sensitivity of interfacial Rheology to film composition and structure; the growing viewpoint of treating proteins films as a two-dimensional gel state; recent theoretical modelling of interfacial rheological effects; those few publications that attempt to relate interfacial Rheology to bulk stability. It is concluded that there have been few major advances in the last 4 or 5 years, but the heterogeneity of such adsorbed films seems to be better recognized, both spatially and rheologically, with the challenge remaining to connect this picture to the stability of the corresponding bulk sytems. © 2002 Elsevier Science Ltd. All rights reserved.
