Electrophoresis, Electrophoresis

Alternatively, similar motion in a space non-uniform electric field is called dielectrophoresis.

Unfortunately, it has limitations on its validity. It follows, for instance, from the fact that it does not include Debye length -1 . However, Debye length must be important for electrophoresis, as follows immediately from the Figure on the right. Increasing thickness of the DL leads to removing point of retardation force further from the particle surface. The thicker DL, the smaller retardation force must be.

Source: Wikipedia > Electrophoresis