Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 19: Colloids and Complex Fluids I (joint session BP/CPP/DY, organized by CPP)

DY 19.3: Talk

Tuesday, March 21, 2017, 12:00–12:15, ZEU 255

Critical Casimir interactions between Janus particles — •Marcel Labbé-Laurent and Siegfried Dietrich — Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany

Critical fluctuations in binary liquid mixtures give rise to forces acting on immersed colloidal particles. Experiments have demonstrated a remarkable agreement with theoretical predictions for spherical colloids close to a (chemically patterned) substrate [1,2]. At the same time, there has been strong experimental and theoretical interest in studying the self-assembly and the phase behavior of patchy and Janus particles. Although a variety of effective interactions have been proposed to drive the self-assembly, the critical Casimir effect stands out as being particularly suitable because it provides both attractive and repulsive interactions depending on the chemical surface properties, as well as a sensitive control of their strength via minute temperature changes. We present theoretical calculations for the interaction between a single Janus particle and a chemically structured substrate and the effective pair potential between two Janus cylinders as well as between two Janus spheres [3].

[1] C. Hertlein, L. Helden, A. Gambassi, S. Dietrich, and C. Bechinger, Nature 451, 172 (2008).

[2] M. Tröndle, O. Zvyagolskaya, A. Gambassi, D. Vogt, L. Harnau, C. Bechinger, and S. Dietrich, Mol. Phys. 109, 1169 (2011).

[3] M. Labbé-Laurent, and S. Dietrich, Soft Matter 12, 6621 (2016).