DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.19: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Critical Casimir torques acting on cylindrical colloids and Janus particles — •Marcel Labbé-Laurent1,2, Matthias Tröndle1,2, Ludger Harnau1,2, and Siegfried Dietrich1,21Max-Planck-Institut für intelligente Systeme, Stuttgart, Germany — 2Universität Stuttgart, Germany

Critical fluctuations in fluids give rise to forces acting on immersed colloidal particles. These Casimir-like forces are attractive or repulsive depending on the chemical surface properties. Self-assembly of colloids opposite to structured surfaces, induced by the critical Casimir effect, is observed experimentally for colloidal particles immersed in a critical water-2,6-lutidine mixture and is in agreement with theory [1]. Asymmetrical particles experience a critical Casimir torque in the presence of varying boundary conditions. The strength and the direction of the torque depend on the particle shape. Rod-like and disc-like particles exhibit different self-orientation. Similarly, Janus-particles are subject to critical Casimir torques and self-orientate, which may be useful in view of current research or applications.

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

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin