Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 31: Particulate Matter I: From microscopic interactions to collective motion (Focus session)

DY 31.4: Talk

Wednesday, March 22, 2017, 10:45–11:00, ZEU 118

Shear-induced dynamics in colloidal nanoclutches — •Sascha Gerloff and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

Dense colloidal suspensions in strong spatial confinement under shear display complex non-equilibrium dynamics [1-3]. Understanding the shear stress response of these soft materials at the nanoscale is key from a fundamental point of view as well as for applications [3,4].

Here, we discuss results from Brownian dynamic (BD) simulations of strongly confined suspensions of charged colloids under shear in two different set-ups. First, the colloids are confined to a narrow slitpore, which induces the formation of well-defined layers with crystalline inplane structure [2]. We find that the response of this system is dictated by the frictional dynamics between the crystalline layers. In the second set-up, we consider a system consisting of two individually driven rings, confining additional particles between the inner- and the outer ring (Taylor-Couette geometry). We focus on the impact of hydrodynamic interactions on the dynamics and the shear stress response. The overall goal is to identify the dominating transport mechanisms, determining the rheological response.

[1] W. Fornari et al., Phys. Rev. Lett. 116, 018301 (2016).

[2] S. Gerloff and S. H. L. Klapp, Phys. Rev. E (2016) in press.

[3] I. Williams et al., Nat. Phys. 12, 98-U134 (2016).

[4] F. M. Pedrero et al., Phys. Rev. Lett. 115, 138301 (2015).