  We discuss a method for producing automatic 3D connections at right places
between substrates in front to one another. The idea is based on the
materialization of disclination lines working as templates. The lines are first
created in the nematic liquid crystal (5CB) at the very place where microwires
have to be synthesized. Due to their anchoring properties, colloids dispersed
into the nematic phase produce orientational distortions around them. These
distortions, which may be considered as due to topological charges, result in a
nematic force, able to attract the colloids towards the disclinations.
Ultimately, the particles get trapped onto them, forming micro or
nano-necklaces. Before being introduced in the nematic phase, the colloids are
covered with an adhering and conducting polypyrrole film directly synthesized
at the surface of the particles (heterogeneous polymerization). In this manner,
the particles become conductive so that we may finally perform an
electropolymerization of pyrrole monomers solved in 5CB, and definitely stick
the whole necklace. The electric connection thus synthesized is analyzed by
AFM, and its strength is checked by means of hydrodynamic tests. This wiring
method could allow Moore's law to overcome the limitations that arise when
down-sizing the electronic circuits to nanometer scale.
