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PhD Position available: “Machine Learning with Active
Particles” | Leipzig University

A PhD position is available to work under the supervision of Prof. Dr. Frank Cichos on machine learning of active particles.

Active particles are model systems for biological systems like bacteria. They self-propel under energy consumption, but lack besides their physical interactions the possibility to develop behavior, i.e., to react to neighbors or signals in their environment. The PhD student in this project will develop experimental procedures that combine algorithms of artificial intelligence with optical control techniques to allow active particles to develop behavior.

Requirements:

  • should have or expect to achieve a Masters-level degree in Physics
  • interest in working at the interface between soft matter physics, biophysics and photonics
  • strong interest and self-motivation in the subject
  • good experimental practice
  • ability to think analytically and creatively.
  • Good computer skills as well as presentation and writing skills in English

To apply in first instance, please email a motivation letter, an up-to-date CV and your certificates of graduation including a transcript of your courses to Prof. Dr. Frank Cichos (). The position is available immediately. The application deadline is extended to January 31, 2020.

Please visit our group website for more details about our research:

https://www.uni-leipzig.de/~mona   

PhD Position available: “Crystallization of individualized macromolecules” | Leipzig University

Miniaturization is an ongoing trend in modern technology which promises enhanced technologies such as microscopic sensors or molecular machines. These developments require a profound knowledge of the materials properties on the nanoscale since many materials behave very different if reduced to the level of very few or individual molecules.

This PhD project will cover fundamental questions on polymer crystallization and focus particularly on the impact of reduced sample volumes down to individual polymer chains. This will be achieved by a cutting-edge method, which combines nano-structured electrodes and nano-patterned surfaces, to employ dielectric spectroscopy on an ensemble of individualized macromolecules. Topographical characterization of the samples also involves regular atomic force microscopy. The project is embedded in the collaborative research center CRC TRR 102 which joins the forces of leading experts in the field of polymer science and particularly polymer crystallization. This stimulating environment offers many occasions for fruitful exchange and scientific collaborations.

The position has a duration of until June 30, 2023.

Requirements:

  • Master degree in physics
  • fundamental knowledge in soft matter physics and spectroscopic techniques during studies
  • delicate sample preparation is no obstacle because of the candidate’s extraordinary manual skills
  • for the data analysis, some basic programming skills are recommended
  • previous experience in dielectric spectroscopy and/or atomic force microscopy are helpful.

To apply in first instance, please email a motivation letter, an up-to-date CV and your certificates of graduation including a transcript of your courses to Dr. Martin Treß (), Peter Debye Institute for Soft Matter Physics, Leipzig University. The application deadline is extended to January 31, 2020.

PhD Position available: Effects of topological constraints in polymer melts on crystallization and structure formation | Martin Luther University Halle-Wittenberg

PI / Contact Person, Affiliation:
Prof. K. Saalwächter, Prof. T. Thurn-Albrecht
Institut für Physik, Martin-Luther-Univ. Halle-Wittenberg,
NMR group:

Project or job description
The goal of the project is the study of the effect of the constraints exerted by the topological structure and dynamics of the entangled polymer melt on the crystallization and on the semi­cry­stalline morphology of polymers. Using a number of model materials such as linear polymers with different crystallization properties, and mixing short and long entangled chains, the process of structure formation and the resulting semicrystalline materials are investigated in a systematic way. We combine small-angle x-ray scattering and spin diffusion NMR (structure formation), optical microscopy (crystalli­zation kinetics), DSC (thermodynamics), and rheology and solid state NMR (molecular dynamics). Special emphasis is given to the properties of the amorphous fraction of the semicrystalline materials, for which our previous work has evidenced an unexpectedly important role.
For the next stage of the project, which is a close collaboration with another doctoral student focusing on non-NMR techniques, we are seeking a doctoral candidate working on sample preparation (isothermal crystallization) and characterization by various NMR techniques. This involves lineshape analyses and exchange NMR to characterize crystalline dynamics, spin-diffusion techniques for domain size estimation, and other more specific techniques such as multiple-quantum NMR to study the dynamics in the amorphous phase.

Requirements / Restrictions for applicants
The successful candidate should have a Master degree or equivalent in Chemistry or Physics, and some knowledge of NMR spectroscopy and polymer / soft-matter physics. We certainly require profound command of mathematical concepts and some computer programming knowledge as expected from a major in physical chemistry or physics.

Further information / Latest publications
M. Schulz et al., The Underestimated Effect of Intracrystalline Chain Dynamics on the Morphology and Stability of Semicrystalline Polymers. Macromolecules 51, 8377 (2018)
R. Kurz et al., Interplay between Crystallization and Entanglements in the Amorphous Phase of the Crystal-Fixed Polymer Poly(ϵ-caprolactone). Macromolecules 51, 5831(2018)

Please also check our internet page at www.physik.uni-halle.de/nmr for more information on other projects and publications.

Please apply via web portal:
https://blogs.urz.uni-halle.de/irtgpolymers/application/

Entry date is flexible between February 2020 and late Summer 2020.


PhD Position available: Effects of topological constraints in polymer melts on crystallization and structure formation | Martin Luther University Halle-Wittenberg

PI / Contact Person, Affiliation:
Prof. T. Thurn-Albrecht, Prof. K. Saalwächter
Institut für Physik, Martin-Luther-Univ. Halle-Wittenberg,
Experimental Polymer Physics Group:

Project or job description
The goal of the project is the study of the effect of the constraints exerted by the topological structure and dynamics of the entangled polymer melt on the crystallization and on the semi­cry­stalline morphology of polymers. Using a number of model materials such as linear polymers with different crystallization properties, and mixing short and long entangled chains, the process of structure formation and the resulting semicrystalline materials are investigated in a systematic way. We combine small-angle x-ray scattering and spin diffusion NMR (structure formation), optical microscopy (crystalli­zation kinetics), DSC (thermodynamics), and rheology and solid state NMR (molecular dynamics). Special emphasis is given to the properties of the amorphous fraction of the semicrystalline materials, for which our previous work has evidenced an unexpectedly important role.
For the next stage of the project, which is pursued in close collaboration with another doctoral student focusing on NMR techniques, we are seeking a doctoral candidate working on sample preparation and characterization by scattering techniques as well as investigation of mechanical properties.

Requirements / Restrictions for applicants
The successful candidate should   have a Master degree or equivalent in Chemistry or Physics, and some knowledge   of scattering techniques and/or mechanical properties and polymer /   soft-matter physics. We require profound command of mathematical concepts and   good experimental skills and some computer knowledge. We are looking for dedicated candidates capable of doing systematic   and independent work who are willing to collaborate within the group and with   other projects.

Further information / Latest publications
M. Schulz et al., The Underestimated Effect of Intracrystalline Chain Dynamics on the Morphology and Stability of Semicrystalline Polymers. Macromolecules 51, 8377 (2018)
R. Kurz et al., Interplay between Crystallization and Entanglements in the Amorphous Phase of the Crystal-Fixed Polymer Poly(ϵ-caprolactone). Macromolecules 51, 5831(2018)

Please also check our internet page at Please also check our internet page at www.physik.uni-halle.de/fachgruppen/polymer_physics_group/ for more information on other projects and publications. for more information on other projects and publications.

Please apply via web portal:
https://blogs.urz.uni-halle.de/irtgpolymers/application/

Entry date is flexible between February 2020 and late Summer 2020.


PPhD Position available: Substrate-induced molecular order and nucleation in thin films of semicrystalline polymers | Martin Luther University Halle-Wittenberg

PI / Contact Person, Affiliation:
Prof. T. Thurn-Albrecht, Prof. K. Saalwächter
Institut für Physik, Martin-Luther-Univ. Halle-Wittenberg,
Experimental Polymer Physics Group:

Project or job description
The aim of the project is the investigation of crystallization at the interface solid - polymer melt on a microscopic level. For that purpose, we perform structural investigations of thin films or droplets of semicrystalline polymers on well-defined substrates by AFM, optical microscopy and scattering methods. Interface induced crystallization can happen either via heterogeneous nucleation or via prefreezing. While we have acquired some fundamental knowledge of prefreezing during the last few years [1-3], we want to extend our investigations in the next stage of the project to heterogeneous nucleation and to the kinetics of interface-induced crystallization.

Requirements / Restrictions for applicants
The successful candidate should have a Master degree or equivalent in Physics or Chemistry, and some knowledge of polymer / soft-matter physics. Experience with AFM techniques or X-ray scattering would be an advantage. We require profound command of mathematical concepts and good experimental skills and some computer knowledge.
We are looking for dedicated candidates capable of doing systematic and independent work who are willing to collaborate within the group and with other projects.

Further information / Latest publications
[1]  Löhmann, A. K.; Henze, T.; Thurn-Albrecht, T. Direct observation of prefreezing at the interface melt-solid in polymer crystallization. Proceedings of the National Academy of Sciences of the United States of America 2014, 111 (49), 17368-17372.
[2] Dolynchuk, O.; Tariq, M.; Thurn-Albrecht, T. Phenomenological Theory of First-Order Prefreezing. J Phys Chem Lett 2019, 10, 1942-1946
[3] Flieger, A.-K.; Schulz, M.; Thurn-Albrecht, T. Interface-Induced Crystallization of Polycaprolactone on Graphite via First-Order Prewetting of the Crystalline Phase. Macromolecules 2018, 51 (1), 189-194

Please also check our internet page at Please also check our internet page at www.physik.uni-halle.de/fachgruppen/polymer_physics_group/ for more information on other projects and publications. for more information on other projects and publications.

Please apply via web portal:
https://blogs.urz.uni-halle.de/irtgpolymers/application/

Entry date is flexible between February 2020 and late Summer 2020.


Further open postdoctoral positions

Further open PhD student positions


Fomer positions

Please find an overview of former job postings here.

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