Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Chemische Physik und Polymerphysik

CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER

CPP 5.5: Poster

Freitag, 4. März 2005, 17:15–19:00, Poster TU D

Hydrodynamic simulation of star polymers under shear — •Marisol Ripoll, Kiaresch Mussawisade , Roland G. Winkler, and Gerhard Gompper — IFF, Forschungszentrum Juelich, Germany

The dynamics of star polymers in solution under shear flow is studied through a novel mesoscopic simulation technique called Stochastic Rotation Dynamics (SRD) or alternatively Multi-Particle-Collision dynamics (MPCD) [1]. It has been demonstrated that, by varing the model parameters, the Schmidt number can be large enough such that the solvent properly accounts for hydrodynamic interactions [2].

In this work, the influence of shear on a single star polymer is analyzed as a function of the shear rate, the functionality of the star, the length of the arms, and the properties of the solvent. It is observed that for shear rates exceeding the rotational relaxation time of a single arm, the star polymer deforms and aligns with the shear flow.

[1] A. Malevanets and R. Kapral. J. Chem. Phys, 110, 8605–8613, (1999). J. Chem. Phys, 112, 7260–7269, (2000).

[2] M. Ripoll, K. Mussavisade, R. G. Winkler and G. Gompper. Europhys. Lett., 68, 106–112, (2004). R. G. Winkler, K. Mussavisade, M. Ripoll and G. Gompper. J. Phys.:Condens. Matter, 16, S3941–S3954, (2004).