Starting with an introduction to the nature of colloids, the book goes on to explore the linkage between colloids and surface properties, with examples of wetting and surface modification. Included within the text are keynote sections written by practicing industrial research scientists, bringing to the reader of wealth of real industrial examples. These examples range from water treatment through to soil management and the coatings and photographic industries.
To aid accessibility, some of the more demanding mathematical derivations are separated from the main text and can be avoided as required. Tried and tested experiments are included throughout enabling the reader to explore the fundamental theory and industrial applications.
- Invaluable introduction to this exciting, interdisciplinary field.
- Carefully structured chapters, with learning objectives and tutorial questions, answers and explanatory notes.
- Suitable for students taking a first course on colloid and surface chemistry.
Introduction to the nature of colloidal solutions.
The forces involved in colloidal stability.
Types of colloidal systems.
The link between colloids and surfaces.
Wetting properties and their industrial importance.
Recommended resource books.
2. Surface Tension and Wetting.
The equivalence of the force and energy description of surface tension and surface energy.
Derivation of the Laplace pressure equation.
Methods for determining the surface tension of liquids.
Capillary rise and the free energy analysis.
The Kelvin equation.
The surface energy and cohesion of solids.
The contact angle.
Industrial Report: Photographic–quality printing.
Experiment 2.1: Rod in free surface (RIFS) method for the measurement of the surface tension of liquids.
Experiment 2.2: Contact angle measurements.
3. Thermodynamics of Adsorption.
Basic surface thermodynamics.
Derivation of the Gibbs adsorption isotherm.
Determination of surfactant adsorption densities.
Industrial Report: Soil microstructure, permeability and interparticle forces.
Experiment 3.1: Adsorption of acetic acid on to activated charcoal.
4. Surfactants and Self–assembly.
Introduction to surfactants.
Common properties of surfactant solutions.
Thermodynamics of surfactant self–assembly.
Self–assembled surfactant structures.
Surfactants and detergency.
Industrial Report: Colloid science in detergency.
Experiment 4.1: Determination of micelle ionization.
5. Emulsions and Microemulsions.
The conditions required to form emulsions and microemulsions.
Emulsion polymerization and the production of latex paints.
Emulsions in food science.
Industrial Report: Colloid science in foods.
Experiment 5.1: Determination of the phase behaviour of microemulsions.
Experiment 5.2: Determination of the phase behaviour of concentrated surfactant solutions.
6. Charged Colloids.
The formation of charged colloids in water.
The theory of the diffuse electrical double–layer.
The Debye length.
The surface charge density.
The zeta potential.
The Hückel equation.
The Smoluchowski equation.
Corrections to the Smoluchowski equation.
The zeta potential and flocculation.
The interaction between double–layers.
The Derjaguin approximation.
Industrial Report: The use of emulsions in coatings.
Experiment 6.1: Zeta potential measurements at the silica/water interface.
7. Van der Waals forces and Colloid Stability.
Historical development of van der Waals forces and the Lennard–Jones potential.
Van der Waals forces between macroscopic bodies.
Theory of the Hamaker constant.
Use of Hamaker constants.
The DLVO theory of colloid stability.
Some notes on van der Waals forces.
Industrial Report: Surface chemistry in water treatment.
8. Bubble Coalescence, Foams and Thin Surfactant Films.
Thin–liquid–film stability and the effects of surfactants.
Repulsive forces in thin liquid films.
The Langmuir trough.
Langmuir Blodgett films.
Experiment 8.1: Flotation of powdered silica.
1. Useful Information.
2. Mathematical Notes on the Poisson Boltzmann Equation.
3. Notes on Three–dimensional Differential Calculus and the Fundamental Equations of Electrostatics.