Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Fluids and Interfaces II

CPP 58.1: Talk

Thursday, March 23, 2017, 10:15–10:30, ZEU 255

Elastic capsules at liquid-liquid interfaces — •Jonas Hegemann¹, Horst-Holger Boltz², and Jan Kierfeld¹ — ¹TU Dortmund, 44221 Dortmund, Germany — ²Georg-August-Universität Göttingen, 37077 Göttingen, Germany

We investigate capsules consisting of a hollow spherical shell filled with an incompressible liquid. We consider shells made from isotropic and thin materials with Hookean bending and stretching elasticity. When adsorbing to a liquid-liquid interface, initially spherical capsules undergo equatorial expansion due to isotropic in-plane tension and become discus-shaped. During spreading within the liquid-liquid interface, the adsorption energy increases significantly leading to mechanical stabilization of the interface. The full range of shapes is bounded between the spherical rest shape and a liquid lense, whose shape is solely determined by balance between the set of surface tensions and pressure differences. The intermediate regime can be explored in terms of the shell's elastic moduli. By use of non-linear elastic shell theory, we calculate capsule shapes at liquid-liquid interfaces and provide a method, which allows for estimating the elastic moduli from experimental setups.