  The electrohydrodynamics of vesicle suspensions is characterized by studying
their pairwise interactions in applied DC electric fields in two dimensions. In
the dilute limit, the rheology of the suspension is shown to vary nonlinearly
with the electric conductivity ratio of the interior and exterior fluids. The
prolate-oblate-prolate transition and other transitionary dynamics observed in
experiments and previously confirmed via numerical simulations is further
investigated here for smaller reduced areas. When two vesicles are initially
un-aligned with the external electric field, three different responses are
observed when the key parameters are varied: (i) chain formation--they
self-assemble to form a chain that is aligned along the field direction, (ii)
circulatory motion--they rotate about each other, (iii) oscillatory
motion--they form a chain but oscillate about each other.
