semmelweis university 2 0 1 2 / 2 0 1 3

SEMMELWEIS UNIVERSITY / FACULTY OF PHARMACY
424
COLLOID CHEMISTRY
Lecturer: Dr. Ferenc Csempesz
Second Semester
Week Lectures (2 hours per week)
1 What are colloids? Definitions, nomenclature, historical perspective.
2 Basic principles of colloid stability
Intermolecular forces, interparticle forces, effect of the intervening medium.
Electrostatic forces and the electrical double layer.
3 Steric repulsion, the effect of adsorbed or anchored layers.
The total interaction potential curve.
4 Preparation of colloidal dispersions
Dispersion methods, condensation methods: nucleation and particle growth.
Emulsion and dispersion polymerization. Preparation of monodisperse colloids.
5 Interfaces
Surface tension, surface energy, wetting phenomena.
6 Adsorption: the Gibbs adsorption equation, the influence of adsorption
on interparticle forces The effect of the curvature of surfaces on equilibrium.
7 Some important properties of colloids.
Kinetic properties: Brownian motion, diffusion, osmosis, Donnan equilibrium,
dialysis, electrokinetic phenomena, sedimentation and creaming.
Scattering of radiation: light scattering, neutron scattering.
8 Rheology: viscosity, Newtonian and non-Newtonian systems, rheology
of suspensions of colloidal particles.
9 Aggregation processes in colloidal dispersions
Flocculation and coagulation of electrostatically stabilized dispersions,
the Deryagin–Landau–Verwey–Overbeek (DLVO) theory. Reversible flocculation,
bridging flocculation, depletion flocculation, sterically stabilized systems.
Kinetics of coagulation, heterocoagulation.
10 Structure of flocs and sediments.
Coalescence and particle growth.
11 Association colloids and self-assembly systems
Micellisation, solubilization.
12 Thin films, foams and emulsions
Film stability, film tension.
Foams, foaming and antifoaming agents, froth flotation.
Emulsions and microemulsions.
13 Macromolecular colloids and gels
The formation and structure of macromolecules.
General properties of polymer solutions.
Determination of the molecular mass of macromolecules.
Forces leading to gel formation.
Swelling properties of gels.
14 The industrial importance of colloids.