Transcript SPIE lezing - PicoFill Systems

PicoFill-Systems
Outlicensing Electrospray Deposition onto Small Targets
Spraying of Uniform Dots: two methods
1.
Preferred method: spraying on a target followed by an increase of the spraydistance to reduce the electric field which forced the spraying to stop immediately.
At the same time the chip is moved in x or y direction to position the second target
underneath the capillary-tip. Finally, the spray-distance is reduced and spraying
resumes immediately. In-between spraying of dots, the pump may run continuously.
2.
In-between spraying of dots, the electric field can be reduced or turned of by
programming the High Voltage power supply. However, this should be synchronized
with the x-y movement of the chip.
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Spraying of Arrays of Dots
A. Piston pushes liquid
through syringe while
electric field is applied
B. Slide is moved
downward to lower the
electric field: spraying stops
1–2 kV
Spray of
droplets
MicroArray or
slide
C. Slide is moved upward
and spraying resumes
1-2 kV
1-2 kV
Spot
Slide is moved downward
and sideways: typical
200 – 1000 micron
Second spot is
sprayed onto slide
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