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270109 VO Colloid and Interface Science (2020W)

4.00 ECTS (3.00 SWS), SPL 27 - Chemie

An/Abmeldung

Hinweis: Ihr Anmeldezeitpunkt innerhalb der Frist hat keine Auswirkungen auf die Platzvergabe (kein "first come, first served").

Details

max. 50 Teilnehmer*innen
Sprache: Englisch

Prüfungstermine

Lehrende

Termine

introductory lecture on Friday 09.10.2020 10:00 online via BBB in moodle

1st lecture: Wed 14/10/2020 @1300 via BBB in moodle.
2nd lecture Fri 16/10/2020 @1200 via BBB in moodle.


Information

Ziele, Inhalte und Methode der Lehrveranstaltung

Aims
Students familiarise themselves with and understand the fundamentals of colloid and interface chemistry and science. Furthermore, how these principles can be applied: for example to understand the nature of the various inter-particle forces, how they can be calculated and applied. Understanding the origins of surface tension and how it can be altered, e.g. by the addition of surfactants, and knowing the nature of different classes of surfactants, and how they modify the properties of interfaces, be they solid, liquid or gas. Introduction into rheological concepts and viscoelasticity.

Contents:
Particle interactions: van der Waals Forces, Electrical Double layer, the effect of Polymers
Kinetic properties of particles
Interfaces: solid-gas, solid-liquid, liquid-liquid
Surface/Interfacial Tension and Wetting
Surfactants
Emulsions
Rheology of dispersed media

methods:
lectures about the various topics.

Art der Leistungskontrolle und erlaubte Hilfsmittel

oral examination with individual appointment
2 students at a time
in case of Covid-19 restrictions (probably): one student online

Mindestanforderungen und Beurteilungsmaßstab

at least three questions per student
to be positive: more than half of them answered correctly

Prüfungsstoff

content of the lectures

e.g.
- what type of colloidal systems exist?
- what are colloids?
- what are interfaces?
- significant forces between colloidal particles: how they can be calculated in approximation and exactly and how they can be measured?
- how to form emulsions and foams?
- physical properties required for stable foams and emulsions to form
- how to manipulate the wettability of surfaces?
- why surfactants are active at interfaces?
- how to choose type/class of surfactant to use in certain situations? specifically which would be good to form emulsions, as dispersants and good wetting agents? which would be good to destabilise emulsions?
- why are rheological properties important in many applications and how to alter them?
- what is adsorption/absorption? how to describe these phenomena?
- electrical properties of interfaces
- kinetic properties of particles

Literatur

lecture slides
Stokes R.J. &. Evans D.F, Fundamentals of Interfacial Engineering, Wiley, 1997
Berg, JC An introduction to interfaces and colloids: The bridge to nanoscience
Aveyard, R. and Haydon, D. A. An Introduction to the Principles of Surface Chemistry. University Press: Cambridge, 1973
P. Becher, Emulsions and Emulsion Technology (Marcel Dekker), 1983. (see also 1985, 1987)
M.J. Rosen, Surfactants and Interfacial Phenomena, 3rd Ed., John Wiley & Sons Inc, Chichester, 2004.
K. Holmberg, et al., Surfactants and Polymers in Aqueous Solutions, 2nd Ed., John Wiley & Sons Inc, Chichester, 2003.

Zuordnung im Vorlesungsverzeichnis

PC-5, MC-3, A.4, D.1

Letzte Änderung: Do 23.09.2021 13:10