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SHEAR-INDUCED ORIENTATION OF JANUS NANOPARTICLES AT LIQUID INTERFACES

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.1230
pages 1321-1324

Hossein Rezvantalab
Mechanical and Aerospace Engineering Department, Rutgers University, Piscataway, NJ, USA

Shahab Shojaei-Zadeh
Mechanical and Aerospace Engineering Department, Rutgers University, Piscataway, NJ, USA

Sinopsis

We investigate the effect of a hydrodynamic flow on dynamics of Janus nanoparticles adsorbed at a liquid interface. Janus particles of spherical, cylindrical, and disc-shaped geometry are created by tuning the affinity of the atoms on each side of the particle with the interacting fluids. At a sheared interface, all particles eventually approach a steady-state orientation as a result of the balance between shear-induced and capillary torques. At low shear rates, the particles are locked at the upright orientation corresponding to each side being fully immersed in its favorable fluid. There exists a shear rate above which the nanoparticle rotates out of this energetically favorable orientation. This unlocking threshold is higher for more amphiphilic particles due to the stronger capillary forces along the contact line resisting against the shear-induced torque. Moreover, the unlocked particles undergo two types of dynamics: 1) a smooth tilting over a relaxation period approaching a steady configuration, or 2) oscillatory rotations damping toward equilibrium. Our predictions can be used for directed-assembly of such anisotropic particles at liquid interfaces.

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