Week 9 Update

What was Accomplished:

• Experimented the capabilities of the newly arrived syringe(by directly inserting liquids into it)

  • The syringe was able to pump out acetone, photoresist, IPA, and DI consistently

  • The syringe was not leaking regardless of liquid

  • However, these liquids can only be consistently pumped WHEN the syringe is directly attached to tubing, and not to a needle(since the liquid flowing through the exit of the needle actually flows onto the surface of the syringe)

Syringe + needle assembly used to test liquid handling

Pump Assembly 3d print

the syringe + tubing(the tubing should be slightly larger than the syringe nozzle, but this is not the case)

• Took measurements of the syringe(since we, and re-designed CAD models accordingly)

  • The measurement of the syringe hub was different than advertised(around 4mm), in comparison to our 3mm inner diameter syringes

  • To mitigate this issue, while testing the syringe, a luer lock needle was directly attached onto the syringe, instead of PTFE tubing

• 3D printed spin coater container for the lab automation assembly

• 3D printed revised CAD components for pump assembly

Roadblocks:

• Measurements provided by the syringe(as advertised) were inaccurate

• Not ALL of the glass syringes are leak proof, so we have to be very careful selecting the right syringe

Plans for next week:

• Wait for the actual linear actuator motor to arrive to finalize assembly, and compile the code

• Order parts for 3-4 additional syringe pumps

• 3d print the rest of the spin coater