ean 9783527320035 temática QUÍMICA GENERAL año Publicación 2010 idioma INGLÉS editorial WILEY formato CARTONÉ 121,00 €    PEDIR   NOVEDAD

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química general

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)

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Preface GENERAL INTRODUCTION INTERPARTICLE INTERACTIONS AND THEIR COMBINATION Hard-Sphere Interaction ?Soft? or Electrostatic Interaction Steric Interaction van der Waals Attractions Combination of Interaction Forces Flocculation of Dispersions, and Its Prevention Distinction between ?Dilute?, ?Concentrated?, and ?Solid? Dispersions States of Suspension on Standing States of the Emulsion on Standing PRINCIPLES OF STEADY-STATE MEASUREMENTS Strain Rate of Shear Rate Types of Rheological Behavior in Simple Shear Time Effects During Flow: Thixotropy and Negative (or Anti-) Thixotropy Rheopexy Turbulent Flow Effect of Temperature Measurement of Viscosity as a Function of Shear Rate: The Steady-State Regime Non-Newtonians Major Precautions with Concentric Cylinder Viscometers PRINCIPLES OF VISCOELASTIC BEHAVIOR Introduction The Deborah Number Strain Relaxation after the Sudden Application of Stress (Creep) Analysis of Creep Crves The Berger Model (Maxwell + Kelvin) Creep Procedure Stress Relaxation after Sudden Application of Strain Dynamic (Oscillatory) Techniques RHEOLOGY OF SUSPENSIONS Introduction The Einstein Equation The Bachelor Equation Rheology of Concentrated Suspensions Rheology of Hard-Sphere Suspensions Rheology of Systems with ?Soft? or Electrostatic Interaction Rheology of Sterically Stabilized Dispersions Rheology of Flocculated Suspensions Models for the Interpretation of Rheological Results RHEOLOGY OF EMULSIONS Introduction Interfacial Rheology Bulk Rheology of Emulsions RHEOLOGY MODIFIERS, THICKENERS, AND GELS Introduction Classification of Thickeners and Gels Definition of a ?Gel? Rheological Behavior of a ?Gel? Classification of Gels Rheology Modifiers Based on Surfactant Systems USE OF RHEOLOGICAL MEASUREMENTS FOR ASSESSMENT AND PREDICTION OF THE LONG-TERM PHYSICAL STABILITY OF FORMULATIONS (CREAMING AND SEDIMENTATION) Introduction Sedimentation of Suspensions Assessment and Prediction of Flocculation Using Rheological Techniques Assessment and Prediction of Emulsion Coalescence Using Rheological Techniques