Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)
CPP 18.4: Talk
Tuesday, September 6, 2022, 12:30–12:45, H38
Elastic core-shell materials and their deformational behavior — Jannis Kolker1, •Lukas Fischer2, Andreas M. Menzel2, and Hartmut Löwen1 — 1Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany — 2Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany
Elastic materials consisting of an inner part, a core, and an outer part, a shell, of possibly different material properties can be found from planetary scales down to the colloidal microscale. We here describe a situation amenable to analytical theory, namely the linear elastic deformation of a spherical core-shell system in response to an equatorial load in form of a force line density [1]. The relevance of this setup lies in, e.g., functionalized microgel particles absorbed to fluid-fluid interfaces or macroscopic illustrative show-and-tell objects.
Situations of different elastic properties and sizes of core and shell are analyzed to study their influence on the deformational response of the whole system. For example, tuning the two Poisson ratios allows to adjust the relative degree of oblate or prolate deformations and change in volume between core and shell. Due to the overall spherical shape and the two-component structure, the stress and strain distributions become rather inhomogeneous. Using different core and shell materials in colloidal microgel particles allows for inner functionalization while simultaneously adjusting the outer wetting properties.
[1] J. Kolker, L. Fischer, A. M. Menzel, H. Löwen, J. Elasticity, in press.