Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Focus: Disordered Systems, Glasses under Shear I (joint session CPP, DY)

CPP 61.9: Talk

Thursday, March 19, 2015, 12:15–12:30, C 243

Influence of drops on particles under shear — •Laurent Gilson, Jennifer Wenzl, and Günter Auernhammer — Max Planck Institute for Polymer Research, Physics at Interfaces, Mainz

We will present shear zone formation in granulates with and without the influence of liquid droplets. 3D Laser Scanning Confocal Microscopy (LSCM) was used to image polydisperse spherical silica particles (7μm) during quasi-steady strain controlled shear experiments.A shear cell was formed using a fixed bottom plate and a nanoindenter tip [1]. This arrangement creates a strain-controlled shear cell without lateral walls. Samples consisted of polydisperse spherical silica particles suspended in an index matching liquid. Immiscible droplets were used as a second phase. Position and form of the droplets, as well as position and size of the particles were recorded simultaneously using a dual channel LSCM [1,2,3]. Multiple images were taken during shear. A complete record of individual particle and droplet movement during shear was extracted.

We will focus our presentation on the differences between particles attached to droplets and particles in bulk. We will discuss differences and common features, as well as compare the results to features commonly found in sheared granular matter.

[1] Wenzl, J., Seto, R., Roth, M., Butt, H.-J., Auernhammer, G., Granul. Matter, 15, 391-400 (2012). [2] Crocker, J.C., Grier, D.G, J. Colloid Interface Sci. 179(1), 298-310 (1996). [3] Roth, M., Schilde, C., Lellig, P., Kwade, A., Auernhammer, G., Eur. Phys. J. E, 35(11), 124 (2012)