Suspensions and Emulsions

Module Notes
Faculty Member (Members):
  • Academic Fellow
Undergraduate, 10th Semester (5th Year, Spring)
Module Category: Thematic Unit Electives, Group B
Module Type: Core Chemical Engineering
Teaching Language: Greek
Course Code: CHM_E_Β6
Credits: 3
ECTS Credits: 4
Teaching Type: Lectures (3h/W) Project/Homework (5/Semester)
Module Availability on Erasmus Students: No
Course URL: E-Class (CMNG2128)
Module Details

Acquaintance with dispersed systems (Definitions, preparation, characterization)

Deviation of electrolyte solutions from ideal behaviour.  Ion-ion interactions.

Mechanism of development of surface charge on  particles suspended in electrolyte solutions

Methods and techniques of measurement of surface charge of  colloids suspended in electrolyte solutions

Films and Foams

Stability of colloid suspensions and of foams.  Theoretical and practical aspects

Kinetics of destabilization of colloidal systems

Prerequisites desired:  Knowledge of electrolyte solutions theory

Dispersed matter.  Liposomes and emulsions.  The solid-liquid interface. DEBYE-HUCKEL theory for electrolytes.  Extension to charged interfaces.  The electrical double layer.  Negative adsorption, Donnan equilibria and ion exchange.  The point of zero charge.  Thermodynamic analysis of the electrical double layer.  The electrocapillary curve (Lippmann equation). Experimental measurements of the electro capillary curves and their significance for the electrical double layer parameters.  Specific adsorption.  Potentiometric titrations.  Surface and ζ potential. Electrokinetic phenomena.  Films and foams and their respective stability.  The role of surfactants and drain. Repulsion between approaching double layers. Stability of lyophobic colloids.   The DLVO theory. The  Schultze-Hardy rule. The interaction between two particles.  The  Hamaker coefficient. The aggregation concentration

Teaching Organization

LECTURES: 3 h/w
PROJECT / HOMEWORK: 5/semester

Total Module Workload (ECTS Standards):

119 Hours

Final mark based on the final written exam.  Homework assignments are taken into consideration.

  • Κ. Παναγιώτου, “Διεπιφανειακά Φαινόμενα & Κολλοειδή Συστήματα”, Εκδ. Ζήτη, Θεσσαλονίκη, 1998.
  • Π.Κουτσούκος, “Χημεία Κολλοειδών”, Πανεπιστήμιο Πατρών, 1996
  • P.C.Hiemenz, R.Rajagopalan, “Principles of Colloid and Surface Chemistry”, 3rd Ed. CRC Press, 1997
  • D.J.Shaw, “Introduction to Colloid and Surface Chemistry”, 4th ed., Butterworth-Heinemann, Oxford, 1992