  We observe novel positional control of a colloidal particle in microchannel
flow of a nematic liquid crystal. Lattice Boltzmann simulations show multiple
equilibrium particle positions, the existence and position of which are tunable
using the driving pressure, in direct contrast to the classical
Segre-Silberberg effect in isotropic liquids. In addition, particle migration
in nematic flow occurs an order of magnitude faster. These new equilibria are
determined through a balance of elastic forces, hydrodynamic lift and drag as
well as order-flow interactions through the defect structure around the
particle.
