Untersuchungen über die Wechselwirkungen von gestreckten, immobilisierten Polyelektrolyten mit externen elektrischen Feldern und Flüssigkeitsströmungen in Gegenwart beschränkter Mikrogeometrien

• Antragsteller: Professor Dr. Steffen Hardt; Professor Dr. Christian Holm
• Fachliche Zuordnung: Experimentelle und Theoretische Polymerphysik ; Präparative und Physikalische Chemie von Polymeren ; Statistische Physik, Nichtlineare Dynamik, Komplexe Systeme, Weiche und fluide Materie, Biologische Physik
• Förderung: Förderung von 2012 bis 2020
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 234079989

• Erstellungsjahr: 2019

Zusammenfassung der Projektergebnisse

In summary, we gained important knowledge on fundamental aspects of polymer physics. Concerning the collaboration between the groups of Prof. Hardt and the group of Prof. Holm we were very successful in studying the stretching and relaxation behavior of tethered polyelectrolytes in confinement, and directly compare experimental results to simulations. Furthermore, the investigation of important electrostatic and -kinetic effects as well as hydrodynamics in the field of polyelectrolytes lead to interesting new findings and developments of numerical methods.

Projektbezogene Publikationen (Auswahl)

• “Lattice-Boltzmann simulations of the electrophoretic stretching of polyelectrolytes: The importance of hydrodynamic interactions”. In: The Journal of Chemical Physics 140.16, 164904 (2014), p. 164904
  Owen A. Hickey, Christian Holm, and Jens Smiatek
  
• “Mobility Reversal of Polyelectrolyte-Grafted Colloids in Monovalent Salt Solutions”. In: Physical Review Letters 113 (23 Dec. 2014), p. 238301
  Shervin Raafatnia, Owen A. Hickey, and Christian Holm
  
• “Electrophoresis of a Spherical Polyelectrolyte-Grafted Colloid in Monovalent Salt Solutions: Comparison of Molecular Dynamics Simulations with Theory and Numerical Calculations”. In: Macromolecules 48.3 (2015), pp. 775–787
  Shervin Raafatnia, Owen A. Hickey, and Christian Holm
  
• “Importance of varying permittivity on the conductivity of polyelectrolyte solutions”. In: Physical Review Letters 115 (11 Sept. 2015), p. 118301
  F. Fahrenberger, O. A. Hickey, J. Smiatek, and C. Holm
  
• “Electricfield-induced stretching of surface-tethered polyelectrolytes in a microchannel”. In: Physical Review E 96.3 (2017), p. 032503
  Tamal Roy, Kai Szuttor, Jens Smiatek, Christian Holm, and Steffen Hardt
  
• “Stretching of surface-tethered polymers in pressure-driven flow under confinement”. In: Soft Matter 13 (2017), pp. 6189–6196
  Tamal Roy, Kai Szuttor, Jens Smiatek, Christian Holm, and Steffen Hardt
  
• “The stretching force on a tethered polymer in pressure-driven flow”. In: The Journal of Chemical Physics 147.3 (2017), p. 034902
  Kai Szuttor, Tamal Roy, Steffen Hardt, Christian Holm, and Jens Smiatek
  
• “From the Atomistic to the Macromolecular Scale: Distinct Simulation Approaches for Polyelectrolyte Solutions”. In: Handbook of Materials Modeling: Methods: Theory and Modeling (2018), pp. 1–15
  Jens Smiatek and Christian Holm
  
• “Relaxation of surface-tethered polymers under moderate confinement”. In: Soft matter 14.38 (2018), pp. 7926–7933
  Johannes Hartmann, Tamal Roy, Kai Szuttor, Jens Smiatek, Christian Holm, and Steffen Hardt