Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Focus: Soft Matter and Nanocomposites - New opportunities with advanced neutron sources II

CPP 19.3: Vortrag

Montag, 16. März 2020, 15:30–15:45, ZEU 222

Structural characterization and rheology of biocompatible wormlike micelles - comparing experiment and theory — •Benjamin von Lospichl1,2, Sabine H. L. Klapp2, and Michael Gradzielski11Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, D-10623 Berlin — 2Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin

Wormlike micelles exhibit a unique viscoelastic behaviour, which has been investigated intensely in the past decades by experimentalists and theoreticians [1,2]. Within our studies we explore the self-assembled structures and the flow behaviour of biocompatible wormlike micelles, which are a mixture of a short-chained C8 cationic surfactant and the salts of long-chained C18 to C22 omega-9 fatty acids. The variation of the omega-9 fatty acids yields a change in thickness of the micelles, which strongly influences the flowing properties of the system. To characterize the size distribution and the relaxation time of the micellar solutions we use neutron scattering, rheology and electric birefringence. The obtained experimental results are then quantitatively compared to an established theoretical model describing the dynamics of micelles under shear. The model links mechanical properties such as stress to structural quantities like alignment or micellar length [3].

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

[2] P. D. Olmsted, Rheo. Acta 47, 283, (2008)

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

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