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

作者：Vezirov Tarlan A^*; Gerloff Sascha; Klapp Sabine H L

来源：Soft Matter, 2015, 11(2): 406-413.

DOI：10.1039/c4sm01414f

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.

• 出版日期2015