High order nonlinear electrophoresis in a nematic liquid crystal
Physical Review Letters(2024)
摘要
Electrophoresis is the motion of particles relative to a surrounding fluid
driven by a uniform electric field. In conventional electrophoresis, the
electrophoretic velocity grows linearly with the applied field. Nonlinear
effects with a quadratic speed vs field dependence are gaining research
interest since an alternating current field could drive them. Here we report on
the giant nonlinearity of electrophoresis in a nematic liquid crystal in which
the speed grows with the fourth and sixth powers of the electric field. The
mechanism is attributed to the shear thinning of the nematic environment
induced by the moving colloid. The observed giant nonlinear effect dramatically
enhances the efficiency of electrophoretic transport.
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