SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 23: Statistical Physics: General II

DY 23.1: Vortrag

Dienstag, 28. März 2023, 14:00–14:15, ZEU 250

Microscopic theory for the shear-induced structure distortion in concentrated suspensions of spherical colloids — •Carmine Anzivino1, Francesco Leone1, Luca Banetta2, Michael S. Murillo3, and Alessio Zaccone11Department of Physics "A. Pontremoli", University of Milan, via Celoria 16, 20133 Milan, Italy — 2Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy — 3Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan 48824, USA

We combine an analytical solution of the Smoluchowski convection-diffusion equation that fully takes into account the boundary-layer structure, with generalized integral equations of the liquid state. We investigate the shear-induced structural distortion in suspensions of spherical colloids, in concentrated regimes of packing fraction so far explored only by means of numerical simulations [1].

For hard spheres, our findings are in very good parameter-free agreement with numerical data from literature [2]. In addition, our scheme predicts (for the first time) a consistent enhancement of the structure factor S(k) at vanishing k, upon increasing the shear rate, which we argue may signal the onset of a shear-induced phase transition from the isotropic phase to a non-uniform one.

[1] L. Banetta, F. Leone, C. Anzivino, M.S. Murillo and A. Zaccone, Phys. Rev. E 106, 044610 (2022). [2] J.F. Morris and B. Katyal, Physics of Fludis 14, 1920 (2002).

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