Figure 5.

Properties of spin coated DHIA TFCs. (a) Correlation of active layer thickness to the weight percent of DHIA in solution when spin coated at 1000 rpm. Thickness was found by measuring cross sections of SEM images. (b) Salt rejection and water permeance of DHIA TFCs spin coated from 2 to 5 wt % DHIA solutions at 1000 rpm. (c) Effect of spin coating speed on the active layer thickness of a 4 wt % DHIA solution. (d) Salt rejection and water permeance of DHIA TFCs spin coated from 4 wt % DHIA solution at 1000 and 3000 rpm. All DHIA TFCs were tested with 2000 ppm of NaCl at 400 psi and pH 5.2 in dead-end mode. Dashed lines are provided as a guide to the eye.