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| Hauptseite > Publikationsdatenbank > Tethered Semiflexible Polymer under Large Amplitude Oscillatory Shear |
| Hauptseite > Publikationsdatenbank > Tethered Semiflexible Polymer under Large Amplitude Oscillatory Shear |
| Journal Article | FZJ-2019-02749 |
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2019
MDPI
Basel
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Please use a persistent id in citations: http://hdl.handle.net/2128/22176 doi:10.3390/polym11040737
Abstract: The properties of a semiflexible polymer with fixed ends exposed to oscillatory shear flow are investigated by simulations. The two-dimensionally confined polymer is modeled as a linear bead-spring chain, and the interaction with the fluid is described by the Brownian multiparticle collision dynamics approach. For small shear rates, the tethering of the ends leads to a more-or-less linear oscillatory response. However, at high shear rates, we found a strongly nonlinear reaction, with a polymer (partially) wrapped around the fixation points. This leads to an overall shrinkage of the polymer. Dynamically, the location probability of the polymer center-of-mass position is largest on a spatial curve resembling a limaçon, although with an inhomogeneous distribution. We found shear-induced modifications of the normal-mode correlation functions, with a frequency doubling at high shear rates. Interestingly, an even-odd asymmetry for the Cartesian components of the correlation functions appears, with rather similar spectra for odd x- and even y-modes and vice versa. Overall, our simulations yielded an intriguing nonlinear behavior of tethered semiflexible polymers under oscillatory shear flow
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