Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 53: Complex Fluids and Soft Matter (joint session DY/ CPP / BP)

DY 53.10: Talk

Wednesday, March 14, 2018, 18:00–18:15, BH-N 334

Squeezing bio-capsules into a constriction: deformation till break-up — •Badr Kaoui, Anne Le Goff, and Anne-Virginie Salsac — Biomechanics and Bioengineering Laboratory (UMR 7338), CNRS, Sorbonne Universités, Université de Technologie de Compiègne, Compiègne, France

We study experimentally the deformation and break-up of liquid-filled capsules trapped at an axisymmetric step constriction, and subjected to increasing pressure drops. We considered biological (trout fish eggs) and bioartificial (made of ovalbumin and alginate) ones, with the objective to characterize the transition to break-up. We find that both capsule populations behave as a brittle material. They do not exhibit any plastic deformation prior to break-up. Moreover critical pressure drop exhibits a stochastic behavior as known for the fracture of disordered media. The break-up probability follows a three-parameter Weibull distribution, from which one can deduce the capsule rupture characteristics [A. Le Goff, B. Kaoui, G. Kurzawa, B. Haszon, A.-V. Salsac, Squeezing bio-capsules into a constriction: deformation till break-up, Soft Matter 13, 7644 (2017)].