Title: Brownian dynamics of elongated particles in a quasi-2D isotropic liquid,
Abstract: We demonstrate experimentally that the long-range hydrodynamic interactions
in an incompressible quasi 2D isotropic fluid result in an anisotropic viscous
drag acting on elongated particles. The anisotropy of the drag is increasing
with increasing ratio of the particle length to the hydrodynamic scale given by
the Saffman-Delbrück length. The micro-rheology data for translational and
rotational drags collected over three orders of magnitude of the effective
particle length demonstrate the validity of the current theoretical approaches
to the hydrodynamics in restricted geometry. The results also demonstrate
crossovers between the hydrodynamical regimes determined by the characteristic
length scales.