Table 1 Fabrication process steps and filtration experiment configurations for each membrane sample prepared using doctor blade extrusion (DBE) and slot die coating (SDC) (all samples were prepared using a dope solution concentration of 17 wt% polymer, 83 wt% solvent, and at room temperature (21.1 °C ± 1.9 °C))

DBE-1

Solution coated onto glass plate with 0.2 mm coating gap, 200 cm/min casting speed

Filter paper placed underneath membrane

DBE-2

Solution coated onto glass plate with 0.2 mm coating gap, 200 cm/min casting speed

Support layer placed underneath membrane

DBE-3

Solution coated onto support layer sheet with 0.2 mm coating gap, 200 cm/min coating speed

Support layer connected to membrane

DBE-4

Solution coated onto support layer sheet with 0.05 mm coating gap; solution coated on top of previously coated film with 0.2 mm coating gap, 200 cm/min casting speed

Support layer connected to membrane

Sample ID

Fabrication Process

Filtration Configuration

SDC-1

Solution coated onto glass platen with 0.2 mm coating gap, 3.5−90 mL/min flow rate, 5.4−40.2 mm/s substrate speed

Filter paper placed underneath membrane

SDC-2

Solution coated onto support layer sheet with 0.2 mm coating gap, 3.5−90 mL/min flow rate, 5.4−40.2 mm/s substrate speed

Support layer connected to membrane

SDC-3

Support layer sheet spray-coated onto support layer sheet for 3 min at 5.52 psi; solution coated onto support layer sheet with 0.2 mm coating gap, 3.5−90 mL/min flow rate, 5.4−40.2 mm/s substrate speed

Support layer connected to membrane

SDC-4

Support layer sheet compressed using rolling pin; support layer sheet spray-coated onto support layer sheet for 3 min at 5.52 psi; solution coated onto support layer sheet with 0.2 mm coating gap, 3.5−90 mL/min flow rate, 5.4−40.2 mm/s substrate speed

Support layer connected to membrane