Modified Dielectrophoresis: Motion of objects in AC fields from FIXED dipole moments

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Keywords: dielectrophoresis, modified dielectrophoresis, fixed dipole and induced dipole moment

Wiki by Bryan Kaye

I am very interested in Topic 7 Charged Interfaces. Specifically, dielectrophoresis (slide 38)

Dielectrophoresis is the motion of objects due to the electric permeability of the object. Electric fields can induce a dipole moment in an object. Objects with dipole moments (induced or fixed) feel a force from inhomogeneous E-fields. Many biological objects have large FIXED dipole moments (this is what is meant by the term "polar" object) and are also effected by inhomogeneous E-fields. In fact, some medical devices claim a mechanism of action based on fixed dipole moments ( Modified dielectrophoresis (a term I coined) stems from E-Fields acting on fixed dipole moments, while dielectrophoresis stems from E-fields acting on induced dipole moments. However, this original work that I will present here is useful to dielectrophoresis because if there are polar objects, then often dielectrophoresis and Modified dielectrophoresis will both have an effect. Here I exam the effect of E-fields on fixed dipoles in the low-reynolds number regime. Induced dipole moments are ignored.

Because of the extensive use of equations, I wrote this up in Latex and put up pictures of the PDF. Notice this is for polar objects (FIXED dipole).