I want to push some very tiny foils of AL on a substrate for the distance of
a few micrometer. The friction force is around 5 to 20 uN. I will use a
vision system to feedback the position and control pushing over time. To do
so, I am urgently looking for a *comb-drive micro-actuator*  (or any other
type of electrostatic microactuator) which can deliver me forces in the
needed range. Any one can give me any idea where to find one? Or any
research lab who can sell or loan me for a short time their microactuator
which has a tip accessible for pushing? I do not want thermal actuation as I
need to do a controllable pushing. Any help?