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Advertising division: ICS-2 - Theoretical Soft Matter and Biophysics
Reference number: 2019D-011, Physics

PhD position: Colloidal hydrodynamic microrotors

The project:
The swimming motion of micron-size objects, such as bacteria, sperm, or colloids, occurs in a regime where friction and viscosity are the dominating effects of the fluid. This results in an intriguing variety of non-equilibrium behaviors which has recently become a very rich and lively research field. Artificial micrometer-sized swimmers can be synthesized nowadays and used for experiments and industrial applications.

Magnetic or dipolar colloidal particles have shown to be able to rotate in an externally imposed rotating fields. While the motion of single rotating colloids does not show any directional motion, several rotors have shown enhanced diffusion, and other interesting cooperative effects. The aim of the work is to explore the behavior of these activated particles at low and large concentration, in bulk and in confined conditions, by means of state-of-the-art computer simulations. The project will be carried out in close collaboration with experimental groups in the University of Oxford and Shenzhen University.

Your profile:
We are looking for a highly motivated candidate with a Master title in physics, or closely related subjects. Given that the main focus of the project is to develop and to perform computer simulations within the framework of statistical physics, relevant experience and enthusiasm for this type of work is required. Knowledge of soft matter physics and related areas would be an advantage. Good knowledge of English is mandatory.

Our offer:
We offer a PhD position for three years. You will be employed by the Forschungszentrum Jülich and a PhD student at University of Cologne. We are a young and dynamic research group with excellent computational equipment embedded in the international research environment of Forschungszentrum Jülich. The possibility to apply for membership in the “International Helmholtz Research School of Biophysics and Soft Matter” ( that provides a complementary research training at the inferfaces of physics, chemistry, and biology as well as transferable skills courses is provided to successful candidates.

We aim to employ more women in this area and we therefore particularly welcome female applicants. We also welcome applications from disabled persons.

How to apply:
Please send by email a cover letter, an up-to-date CV, your university transcripts, and at least two contacts for references to:

Dr. Marisol Ripoll
Theoretical Soft Matter and Biophysics
Institute for Complex Systems (ICS-2)
Forschungszentrum Jülich
D-52425 Jülich (Germany)