Dispersive systems

Garant předmětu:

Lecturer:

Tutor:

Supervisor:

Department of Physics

Synopsis:

Classification of dispersion systems (suspensions, emulsions, foams, analytical, colloidal and coarse dispersions)

Colloidal dispersions and their properties. Kinetic properties (Brownian motion, diffusion, sedimentation), electrokinetic phenomena (electrophoresis, electroosmosis). Lyosols (phase, macromolecular and associative colloids).

Surfactants (inorganic, organic, organosilicate, ionic, non-ionic), micelles, critical micellar concentration).

Gels and their classification (reversible, irreversible, inorganic, organic, hydrogels, organogels). Stability of colloidal particles. Emulsions and their classification (dilute, concentrated and highly concentrated, direct, inverted). Properties, stability and structure (coagulation, coalescence, sedimentation).

Foams and their classification (dilute gas-in-liquid dispersions, wet and dry foams, foam stability, foam preparation, defoaming).

Rheological properties of dispersion systems.Einstein's equation for dilute dispersion systems. Effect of concentration, particle shape and their interaction on viscosity. Rheology of concentrated dispersion systems (time-dependent and independent non-Newtonian liquids, viscoelastic liquids, thixotropy, rheopexy). Viscosity measurements, viscometers, rheometers.

Requirements:

none

Syllabus of lectures:

Classification of dispersion systems (suspensions, emulsions, foams, analytical, colloidal and coarse dispersions)

Colloidal dispersions and their properties. Kinetic properties (Brownian motion, diffusion, sedimentation), electrokinetic phenomena (electrophoresis, electroosmosis). Lyosols (phase, macromolecular and associative colloids).

Surfactants (inorganic, organic, organosilicate, ionic, non-ionic), micelles, critical micellar concentration).

Gels and their classification (reversible, irreversible, inorganic, organic, hydrogels, organogels). Stability of colloidal particles. Emulsions and their classification (dilute, concentrated and highly concentrated, direct, inverted). Properties, stability and structure (coagulation, coalescence, sedimentation).

Foams and their classification (dilute gas-in-liquid dispersions, wet and dry foams, foam stability, foam preparation, defoaming).

Rheological properties of dispersion systems.Einstein's equation for dilute dispersion systems. Effect of concentration, particle shape and their interaction on viscosity. Rheology of concentrated dispersion systems (time-dependent and independent non-Newtonian liquids, viscoelastic liquids, thixotropy, rheopexy). Viscosity measurements, viscometers, rheometers.

Syllabus of tutorials:

Exercises follow the lecture topics

Study Objective:

The aim of the study is to introduce students to the properties of dispersive systems.

Study materials:

1. Moore W.J.: Fyzikální chemie, SNTL, Praha 1981

2. Brdička R., Dvořák J.: Základy fyzikální chemie, ACADEMIA, Praha 1977

3. Brož J.: Základy fyzikálních měření I. SPN, Praha 1983

4. Bártovská L., Šišková M.: Fyzikální chemie povrchů a koloidních soustav, skripta VŠCHT, Praha 2005

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: