Rheology of Dispersions. Principles and Applications

  • ID: 2183180
  • Book
  • 216 Pages
  • John Wiley and Sons Ltd
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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
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Tharwat F. Tadros
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