Visualization and analysis of two-phase flow:
Textured substrates which are infiltrated by a lubricant form a new class of functional surfaces, called slippery surfaces. The texture is key for capillary forces to retain the lubricant in place. Slippery surfaces can repel almost all types of liquids. However, moving liquid drops (for example water) are surrounded by an annular wetting ridge, which can cause transport of lubricant (for example an oil) with the moving liquids. The same “problem” shows up if a water film is flowing over the lubricating fluid.
The aim of this project is to understanding the interplay among the physical- and chemical interactions between the solid surface topography, the lubricating film and the liquid under static and flow conditions. To gain insight into the underlying mechanisms, the candidate will apply laser scanning confocal microscopy. This allows visualizing the sliding liquid, the lubricant, and the textured substrate with a spatial resolution of a few hundred nanometers at a line frequency of 8 kHz. The flow field can be visualized by adding tracer particles. The candidate will investigate microstructured surfaces impregnated by Newtonian liquids or swollen gels.
The position requires:
- Knowledge on image processing and programming (Matlab, Mathematica, or Python)
- Interest in hydrodynamics
- Background in physics or mechanical engineering
For further information please contact:
Prof. Doris Vollmer, email@example.com
Max Planck Institute for Polymer Research, Mainz, Germany