Electrokinetic Behavior of Suspensions under AC Applied Fields (Completed)

Suspension of dielectric particles dispersed in fluids is an important
substance in nature. Typical materials in living systems are also
suspensions. Both the suspended particles and the host fluid are
dielectric material with a frequency-dependent (ac) response to applied
fields. As a composite system of particles and host fluid, a suspension
can have a complicated ac response. Namely, the particles in a suspension
may undergo rotational motions in a rotating electric field. The
dielectrophoresis is used to describe the motion of the suspended
particles caused by the electric polarization in a nonuniform field. The
hydrodynamic interaction between the particles can also change the ac
response and the dispersion spectrum of a suspension. In this proposal, we
aim at investigating the ac electrokinetic behavior of a suspension, and
study the effects of the particle motion and the hydrodynamic interaction
among the particles on the ac response.