Bildung von Schaumporen bei der Fällung einer Polymerlösung (PES in NMP, Fällungsmittel: Wasser)

Research group

Morphology Evolution & Transport in Porous Media

Prof. Dr.-Ing. Ulrich Nieken

What is the focus of our research?

Porous functional materials are widely used in reaction engineering, adsorption, membrane technology and many other areas of process engineering such as fuel cells or Li-air batteries. The production of these materials is based mainly on experimental experience and qualitative considerations. The properties of porous functional materials are measured in experimental series, e.g. to derive phenomenological descriptions for the macroscopic transport.

FIB-SEM of activated carbon (c) Markus Osenberg, Helmholtz-Zentrum Berlin
FIB-SEM of activated carbon produced in the research group Prof. Dr.-Ing B.J.M Etzold, Technische Universität Darmstadt / evaluated in adsorption lab plant at ICVT

 (c)
Phase separation of a binary, equimolar polymer mixture

Our research group deals with the prediction of the formation of the porous structure of the materials during the manufacturing process and the prediction of the transport properties. While computational methods are established for single-phase transport, multiphase transport (e.g., gas / liquid) is still the subject of research.

To describe pore formation on the basis of fundamental physical and chemical principles, a simulation tool (SiPER) was developed, which allows to describe moving interfaces in complex geometries, dynamic contact angles and the dynamics of phase separation. This enables the simulation of pore-scale structure formation, for example in spray drying and in membrane precipitation (phase inversion). Also, the penetration of electrolyte into the pores of a Teflon / silver electrode could be simulated successfully.

In addition to the description on the pore scale, the derivation of macroscopic models based on the results on the pore scale is the subject of current research.

 

Contact

Dieses Bild zeigt Nieken
Prof. Dr.-Ing.

Ulrich Nieken

Institutsleiter

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