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Main Title: Manipulating shear-induced non-equilibrium transitions in colloidal films by feedback control
Author(s): Vezirov, Tarlan A.
Gerloff, Sascha
Klapp, Sabine H. L.
Type: Article
Language Code: en
Abstract: Using Brownian Dynamics (BD) simulations we investigate non-equilibrium transitions of sheared colloidal films under controlled shear stress sigma(xz). In our approach the shear rate (gamma) over dot is a dynamical variable, which relaxes on a time scale tau(c) such that the instantaneous, configuration-dependent stress sigma(xz)(t) approaches a pre-imposed value. Investigating the dynamics under this "feedback-control" scheme we find unique behavior in regions where the flow curve sigma(xz)((gamma) over dot) of the uncontrolled system is monotonic. However, in non-monotonic regions our method allows to select between dynamical states characterized by different in-plane structure and viscosities. Indeed, the final state strongly depends on tau(c) relative to an intrinsic relaxation time of the uncontrolled system. The critical values of tau(c) are estimated on the basis of a simple model.
Issue Date: 2015
Date Available: 25-Oct-2017
DDC Class: 530 Physik
Sponsor/Funder: DFG, SFB 912, HAEC - Highly Adaptive Energy-Efficient Computing
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 11
Issue: 2
Publisher DOI: 10.1039/c4sm01414f
Page Start: 406
Page End: 413
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:FG Computersimulationen und Theorie komplexer Fluide » Publications

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