Institute of Mechanical Process Engineering and Mechanics

Stabilität disperser Systeme - Grundlagen

  • type: lecture
  • chair: Applied Mechanics
  • place:

    Geb. 50.31 Raum 210

  • time:

    Di. 14:00 - 15:30 Uhr

  • start: 20.10.2014
  • lecturer:

    Erin Koos 
    Claude Oelschlaeger

  • sws: 1
  • lv-no.: 22916

Stability of Dispersions, Emulsions and Foams

Content

1. Basics

- Entropy and Brownian motion, diffusion, sedimentation
- Thermodynamics of surfaces, interfacial and surface tension, wetting, Gibbs adsorption isotherm
- Colloidal interactions, van der Waals-atraction, dispersion forces, electrostatic interactions, DLVO-theory,
   polymeradsorption and steric interactions, depletion attraction

2. Dispersions

- Elektostatic and steric stabilization
- Flocculation and coagulation,
  rapid coagulation (Smoluchowski-equation),
  slow coagulation,
  flow-induced coagulation

3. Emulsions

- Emulsionification
- Stabilization by surfactants, polymers, proteins, solid particles (Pickering stabilization)
- Creaming and sedimentation
- Coalescence
- Ostwald-ripening
- Phaseinversion

4. Foams

- Structure and topology
- Coalescence
- Disproportionation
- Drainage
- Filmstability und –collapse

5. Practical examples

6. Experimental methods

- Optical methods: static and dynamic lightscattering, turbidity, DWS
- Centrifugation
- Elektrokinetics
- Dielektric spectroscopy, conductivity
- Ultrasound, rheology, calorimetry
- Static and dynamic foamtests

 

Literature

General

Paul C. Hiemenz and Raj Rajagopalan
Principles of Colloid and Surface Chemistry, 3rd Ed.
Marcel Dekker, 1997

Russel, Saville and Schowalter
Colloidal Dispersions
Cambridge University Press, 1989

D. Fennel Evans, Hakan Wennerström
The Colloidal Domain
Wiley VCH, 1994

G. Lagaly, O. Schulz R. Zimehl
Dispersionen und Emulsionen
Steinkopff, 1997

Ian D. Morrison, S. Ross
Colloidal Dispersions Suspensions, Emulsions + Foams
Wiley Interscience, 2002

Schramm, Laurier L.
Emulsions, Foams, and Suspensions - Fundamentals and Applications
Wiley-VCH, Weinheim, 2005

Tadros, Tharwat F. (Hrsg.) Colloid Stability
Volume 1: The Role of Surface Forces - Part I
Colloids and Interface Science Series (Band 1)
Wiley-VCH, Weinheim, 2006

 

Special Topics

Goodwin, Jim
Colloids and Interfaces with Surfactants and Polymers - An Introduction
John Wiley & Sons, 2004

Jerome Bibette, Fernando Leal-Calderon, Veronique Schmitt, and Philippe Poulin
Emulsion Science: Basic Principles, An Overview
Springer, 2002

P. Becher
Emulsions: Theory and Practice, 3rd Ed.
American Chemical Society, 2001

Denis Weaire, Stefan Hutzler
The Physics of Foams
Oxford University Press, 1999

B. P. Binks, Ed.
Modern Aspects of Emulsion Science
Royal Society of Chemistry, 1998