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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.2: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1C

Impact of microstructure on the flow behaviour of micellar systems - a theoretical approach — •Benjamin von Lospichl^1,2, Valentina Alberini¹, Michael Gradzielski², and Sabnine H. L. Klapp¹ — ¹Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin — ²Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, D-10623 Berlin

It has been shown by various experiments that elongated or wormlike micelles exhibit a unique viscoelastic behaviour yielding a non-linear flow [1]. The theoretical descriptions for this phenomenon can be either of tensorial form [2] or they correspond to one-dimensional models including additional degrees of freedom, e.g. a coupling of the mechanical variables and the microstructure [3]. Such a coupling yields a destabilization in the high shear rate branch of the flow curve as well as interesting dynamical states such as oscillatory and/or chaotic states. To improve the performance of this specific model and for a better (quantitative) comparison to experimental results, we explore the possibilities of introducing additional terms to describe the high shear rate behaviour. We also include concentration effects which strongly influence e.g., branching in wormlike micellar systems.

[1] C. Dreiss, Soft Matter 3, 956, (2007)

[2] M. Johnson, D. Segalman, J. Non-Newton. Fluid Mech. 2, 255, (1977)

[3] B. v. Lospichl, S. H. L. Klapp, Phys. Rev. E 98, 042605, (2018)