Active microrheology of fluids with orientational order
Condensed Matter Physics(2024)
摘要
We study the dynamics of a driven spherical colloidal particle moving in a
fluid with a broken rotational symmetry. Using a nematic liquid crystal as a
model, we demonstrate that when the applied force is not aligned along or
perpendicular to the orientational order, the colloidal velocity does not align
with the force, but forms an angle with respect to the pulling direction. This
leads to blue an anisotropic hydrodynamic drag tensor which depends on the
material parameters. In the case of nematic liquid crystal, we give an
analytical expression and discuss the resulting implications for active
microrheology experiments on fluids with broken rotational symmetry.
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关键词
liquid crystals,colloids,,microrheology,lattice Boltzmann methods
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