Decided to start this off by just jumping in and seeing how it goes.
My rough plan of action/goal is as follows: Create sub 150μm diameter microfluidic channels using maskless photolithography. To do this I will use dry film photoresist, silicon wafers, an iron, and a 3D resin printer.
My first steps are:
- Laminate the silicon wafers with the dry film photoresist (DFR) using a programmable iron
- use the high resolution LCD screen from a cheap resin printer (photon S) to project an image onto the DFR, hardening the film in that area.
- Use sodium carbonate to wash away any unexposed DFR
- Pour polydimethylsiloxane (PDMS) over the silicon wafer
- Slap that piece of PDMS onto another slab of PDMS and boom, we've got ourselves a microfluidic chip.
In theory, anyway.
I will be doing this both at MakeIt Labs in Nashua NH and at my apartment. The goal is to find a good recipe that can be followed by anyone with access to a resin printer and allow them to make their own chips.
Throughout this project I'll upload logs as I go and probably photo dump a bunch. Some logs will be lab reports, others will be thoughts and musings on material choice, fluid handling etc. Feel free to comment or PM with any thoughts!