uFluid chip experiment
by merlinjim, published
For details about how these devices operate:
No clue if this is going to work yet. ABS is hydrophillic, this might change the implementation or require a catalyst to convert to hydrophobic. The included .scad let's you specify different PCB and dielectric thicknesses.
Ideas for bottom electrode:
Unicorn-drawn on holder with conductive pen
Ideas for dielectric:
printed dielectric (thickness will be an issue here)
Ideas for top electrode:
Unicorn-drawn on spacer with conductive pen
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This version of the things has a couple minor issues - I had to drill out some holes, cut some new slots, they didn't bolt together so hot (holder section not deep enough) plus the nuts on the bolts were making contact with some of the pins.
I've redesigned it to be a bit wider. I finished printing all the pieces out yesterday; I'll likely etch, assemble, and test later. I'll be updating this object with the new pieces when done.
For materials, I'm leaning more towards kapton now. I just don't think the pcb I got is thin enough to
form a good capacitor. If I had the wide roll of kapton makergear sells I'd be almost done, I'm still debating how to put the tape on so the effect of gaps is minimized.
Maybe in v.3 I'll put the ports and electrodes in a line lol
I've been planning on using RAINX!!! Who knows if it'll work... I've got two chips printed and etched so far and plan on doing another 1-2 tonight, so I've got some room for experimentation. Of course, it could also be totally unnecessary, the device could in theory be working right now and I ju
st need to try it out lol!
Anyone have any thoughts on whether EWOD happens on Kapton (polyimide) surfaces? How thick of a dielectric layer is necessary here? I'm using .14" PCB but I wonder if I should switch over to using the top surface with a kapton dielectric... or even go for a more exotic
Also if you found that interesting there are several more you may like here:
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Print a holder and spacer. The spacer and electrodes are 2-symmetric, meaning you can rotate them 180 degrees but not 90 degrees and end up with the same mechanical construction. The boards are slightly taller than they are wide to assist in assembly.
Create bottom and top electrodes using your method of choice. UFDMixer.gcode should work for a unicorn based etch-resist pen. uFluidChip-Laser.gcode should work for a Laser-Unicorn resist etch.
Connect to arduino and program (open source driver coming soon!)
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