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Issue 2, 2015
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Manipulating shear-induced non-equilibrium transitions in colloidal films by feedback control

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Abstract

Using Brownian Dynamics (BD) simulations we investigate non-equilibrium transitions of sheared colloidal films under controlled shear stress σxz. In our approach the shear rate [small gamma, Greek, dot above] is a dynamical variable, which relaxes on a time scale τc such that the instantaneous, configuration-dependent stress σxz(t) approaches a pre-imposed value. Investigating the dynamics under this “feedback-control” scheme we find unique behavior in regions where the flow curve σxz([small gamma, Greek, dot above]) 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 τc relative to an intrinsic relaxation time of the uncontrolled system. The critical values of τc are estimated on the basis of a simple model.

Graphical abstract: Manipulating shear-induced non-equilibrium transitions in colloidal films by feedback control

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Publication details

The article was received on 28 Jun 2014, accepted on 05 Nov 2014 and first published on 13 Nov 2014


Article type: Paper
DOI: 10.1039/C4SM01414F
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Citation: Soft Matter, 2015,11, 406-413
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    Manipulating shear-induced non-equilibrium transitions in colloidal films by feedback control

    T. A. Vezirov, S. Gerloff and S. H. L. Klapp, Soft Matter, 2015, 11, 406
    DOI: 10.1039/C4SM01414F

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