Because if the particle is polarized it will have equal charges on both ends. Then equal electrical forces will be applied on both ends which means the net force applied will be zero. On the other hand, in a non-uniform electric field, the net force is not zero and the particle will experience a net acceleration.
Please read my review paper: Dielectrophoretic Platforms for Bio-microfluidic Systems.
Regards,
Khashayar
To mobilise the dielectric particles, a partial charge density gradient needs to be generated on the particles to induce a partial or permanant dipole and this can be achieved by externally applied non uniform electric field.
These good folks have already addressed this, but in a uniform electric field the net force is zero and no movement induced. The field has to be non-uniform so there is an imbalance in the forces acting on the particle in question, inducing movement.
Dear all, can an AC electric current drive a nanorod (500 nm long and 50 nm diameter, eg. gold or TiO2) to spin in an aqueous solution? What is the frequency of the AC if this can be done?
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