TY  - JOUR
AU  - Li, Run
AU  - Gompper, Gerhard
AU  - Ripoll, Marisol
TI  - Tumbling and Vorticity Drift of Flexible Helicoidal Polymers in Shear Flow
JO  - Anatomical science international
VL  - 54
IS  - 2
SN  - 0024-9297
CY  - Tokyo
PB  - Springer814959
M1  - FZJ-2021-01092
SP  - 812-823
PY  - 2021
N1  - Kein Post-print verfügbar
AB  - Helicoidal structures are frequent among organisms and macromolecules with biological relevance, whose motion and rheological properties are significantly influenced by the chiral symmetry. The role of filament flexibility and hydrodynamic interactions in the behavior of helix-like polymers in shear flow is investigated here with simulation and analytical approaches. Stability regimes can be identified in dependence of polymer flexibilities and shear rates that result in configurations without helical symmetry. In the stable regime, elongated helices tumble following Jeffery-type orbits, with frequencies corresponding to an effective aspect ratio, which depends on geometry, flexibility, and shear rate. Drift in the vorticity direction can be quantified in the simulations with a velocity that depends both on the helix intrinsic geometrical parameters and on its flexibility. Using resistive force theory, we obtain an expression for the vorticity drift velocity directly as a function of the helix geometry and shear rate that quantitatively describes the simulation results. These results are expected to be useful in the development and optimization of separation techniques of racemic mixtures.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000613936700027
DO  - DOI:10.1021/acs.macromol.0c01651
UR  - https://juser.fz-juelich.de/record/890642
ER  -