the Institute of Physics Nanotechnology and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg 195251;
the Institute of Physics Nanotechnology and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg 195251the Department of Astrophysics Central Astronomical Observatoryat Pulkovo of the Russian Academy of Sciences St.Petersburg 196140;
Casimir pressure; ferrofluids; microdevices; repulsion;