SubjectsSubjects(version: 877)
Course, academic year 2020/2021
  
Dispersion systems I - N409071
Title: Disperzní systémy I
Guaranteed by: Department of Chemical Engineering (409)
Actual: from 2020
Semester: both
Points: 7
E-Credits: 7
Examination process:
Hours per week, examination: 3/2 C+Ex [hours/week]
Capacity: winter:unknown / unknown (unknown)
summer:unknown / unknown (unknown)
Min. number of students: unlimited
Language: Czech
Teaching methods: full-time
Level:  
Is provided by: B409012
For type:  
Additional information: http://předmět je vyučován pouze v letním semestru
Note: you can enroll for the course in winter and in summer semester
Guarantor: Šoóš Miroslav prof. Ing. Ph.D.
Grof Zdeněk Ing. Ph.D.
Z//Is interchangeable with: B409012
This subject contains the following additional online materials
Annotation -
Last update: Štěpánek František prof. Ing. Ph.D. (25.09.2013)
The aim of the course is to familiarise students with the chemical engineering description of phenomena, laboratory and industrial processes during which dispersions or other structured multiphase systems are formed or play a crucial role.
Aim of the course -
Last update: Štěpánek František prof. Ing. Ph.D. (01.10.2013)

After completing the course, the students will be able to:

  • classify dispersion systems
  • make reasoned decisions about the method of preparation of a given type of dispersion system
  • evaluate factors that influence the dispersion system stability.

Literature -
Last update: SEK409 (09.10.2013)

R: R.F. Probstein, Physicochemical hydrodynamics, Wiley, 1994

R: L.L. Schramm, Emulsions, Foams and Suspensions, Wiley, 2005

Learning resources -
Last update: Štěpánek František prof. Ing. Ph.D. (25.09.2013)

http://www.vscht.cz/uchi/ped/index.html

Syllabus -
Last update: Štěpánek František prof. Ing. Ph.D. (25.09.2013)

1. Classification of dispersion systems (emulsions, suspensions, foams...). Particle size distributions, moments.

2. Particle size measurement. Sampling, segregation.

3. Force interactions in particle systems. Electrostatic and osmotic interactions in liquid dispersion systems.

4. Adhesion mechanisms, van der Waals forces, electrostatic forces, capillary forces. Adhesion and surface roughness. Adhesion forces and energies.

5. Dynamics of coagulation and coalescence. DLVO theory, Ostwald ripening. Kinetic and thermodynamic stability of emulsions.

6. Overview of technologies for the preparation of dispersions. Classification according to the type of dispersion and the physical mechanism.

7. Preparation of aerosols. Nucleation and coagulation of particles. Electrospray and spray drying.

8. Extraction with partially miscible solvents. Phase diagrams of water-oil-surfactant systems.

9. HLB of surfactants, preparation of w/o and o/w emulsions. Stability of emulsions. Examples of emulsions.

10. Dispersions of solid particles. Sol-gel methods, precipitation. Colloidal crystals.

11. Emulsion polymerization. Nucleation, stability of emulsions.

12. Porous materials, percolation. Texture analysis, diffusion and sorption in porous media.

13. Foam materials with open and closed cells. Thermal and sound insulation properties of foam materials.

14. Preparation of nanofibres Electrospinning, extrusion.

Registration requirements -
Last update: Štěpánek František prof. Ing. Ph.D. (25.09.2013)

Physics I

Teaching methods
Activity Credits Hours
Účast v laboratořích (na exkurzi nebo praxi) 2 56
Účast na přednáškách 1 28
Příprava na přednášky, semináře, laboratoře, exkurzi nebo praxi 2 56
Příprava na zkoušku a její absolvování 1 28
Účast na seminářích 1 28
7 / 7 196 / 196
Coursework assessment
Form Significance
Examination test 50
Oral examination 50

 
VŠCHT Praha