The growing interest in biological micro-array and Lab-on-Chip
(LOC) is justified by the possibility of reducing the sample
volume, processing time and costs. By means microfluidics seems to
be the prevalent tool for the integration of manifold processes in
miniaturized devices. Anyway at a sub-millimeter scale the liquid
behavior is affected by geometric confinement and wetting
properties. In order to confine the liquid sample inside the LOC
buried channels we have performed the sealing by
poly(dimethylsiloxane)~(PDMS), a silicon-based bi-component
elastomer. The filling dynamics changes at changing of the
polymer mixing ratio of the pre-polymer and the curing agent. In
fact, a different concentration of cross-linker modifies the
elastic, adhesion and wettability properties of the cover-slip
We present a controlled, well-defined pattern replication of a
micrometer template driven by a surface free energy lithographic
technique, realized by molecular aggregation in dewetting
conditions and by confining the liquid solution with geometric
boundaries. The presented technique has allowed the fabrication
of light-emitting devices, and in particular the realization of
OLEDs with an array of addressable pixels.
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