Re: [DIYbio] DIY Microfluidics Device Manufacturing

On 11/21/2013 05:44 PM, Nathan McCorkle wrote:
> I got some eBay photoresist for PCBs and got a local
> photoresist manufacturer to do some simulations for me to get the
> right curved channels with their product. Another thing I'll try is
> the dry photoresist films they sell for PCBs, just heard today that
> they're likely 50-100 microns thick. Getting curved channels often
> requires defocused exposure and some combination of lower-temp/longer
> post exposure bake and/or incomplete develepment.

What width channels are you aiming for?
Is the defocusing to blur jaggies from the DLP or
are you talking curved in cross section?

If curved in cross section, that is crossways with the intent
of a photomask -- usually that wants "gone where light hits"
so all the way through.

Are you wanting to cut trenches in photoresist instead of make
it "go away all the way through where light hits"?

For that, you could mix some light absorbing dye or pigment in with it
so the exposure light would not go all the way through.

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