803009 Adsorption of surfactants/proteins al liquid interfaces, kinetics, thermodynamics, interfacial visco-elasticity (in Eng.)


Art
Vorlesung
Semesterstunden
2
Vortragende/r (Mitwirkende/r)
Miller, Reinhard
Organisation
Institut für Biophysik
Angeboten im Semester
Sommersemester 2019
Unterrichts-/ Lehrsprachen
Englisch

Lehrinhalt

Interfaces are involved in all modern technologies based on liquids, in particular in foamed systems or emulsions. In most cases, stable systems are required, however, also destabilizations are sometimes the aim when for example foams or emulsions are unwantedly created, like in rivers caused by sewage or in petrochemistry during the production of oil. The properties of liquid interfaces can be modified by addition of surface active compounds, such as surfactants or proteins. These substances lead typically to a reduction of the interfacial tension, but can also provide other important properties to the interface, such as a viscoelasticity and stabilizing effects in foams/emulsions against coalescence. The course will give an introduction into the structure of surfactants and proteins, their amphiphilic character, the fundamentals of their adsorption. The time process of the adsorption process will be described by theoretical models as well as experimentally. In particular tensiometry methodologies are discussed, including classical techniques as well as most recent developments. The way of determining the mechanical behaviour of interfacial layers as well as the input into the formation and stability of foams and emulsions will be elaborated. The course is designed for undergraduate, graduate and PhD students, technicians and researches from different fields giving insight into the theoretical and experimental possibilities for understanding liquid interfaces and their role in modern technologies, such as applications in foam and emulsion problems.

Inhaltliche Voraussetzungen (erwartete Kenntnisse)

Basics of physical chemistry and mathematics (bachelor level).

Lehrziel

• Fundamentals of adsorption and theoretical tools.
• Molecular transfer across interfaces and viscoelasticity of interfaces.
• Applications: foam formation, emulsification, stability of disperse systems.
• After the course the student will have gained knowledge in understanding the role of interfaces in modern technologies based on liquids (e.g. bionanothechnogy, food industry, etc.).
• The students will also learn about modern experimental methods and the interpretation of the experimental results.
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