ao8b01398_si_001.avi (2.35 MB)
On the Spraying Modality of Liquids by Pyroelectrohydrodynamics
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posted on 2018-12-19, 09:14 authored by Sara Coppola, Giuseppe Nasti, Veronica Vespini, Valentina Marchesano, Pietro FerraroWe
present for the first time an investigation on the spraying
modality for the pyroelectrohydrodynamic (pyro-EHD) system. We show
that the pyro-EHD spray (p-Spray) works well in the range from far
field (d > 10 mm) to near field (d < 2 mm) without the need of external voltage and without the
needs to change the experimental apparatus in that wide range of distances.
Because the proposed method works without a counter electrode, no
limitations are connected with the geometric shape of the substrate
on which the spray coating is deposited. We report on several examples
of the formation of disperse sprayed droplets, whose size can be varied
between hundreds of micrometers and hundreds of nanometers, as well
as on the production of sprayed pattern footpaths. The results reported
here demonstrate the direct writing of spray patterns of nano/microdroplets
with different materials in a very wide range, that is, from low-
to high-viscous liquid solutions. Finally, as an example of application,
we show the use of the p-Spray for the fabrication of silver-coated
devices showing antimicrobial properties of the pattern produced by
the p-Spray through a customizable and environmental friendly approach.