100K Microcon : wet-wet
I used the EQ format to test the 100K microcons in a wet-wet trial using DI water. The below illustrates a comparison between the hydraulic permeability of the 100K microcons in a wet-dry format (from tests earlier today) vs. a wet-wet format.
The group on the left (1) represents the wet-dry tests done earlier today (previous post). Group two on the other hand is a set of fresh membranes tested in a wet-wet EQ format.
It should be noted that the bottom of the microcon membrane systems have a very large lip surrounding the base of the membrane. I did my best to make sure that the water in the bottom of the EQ tube touched the microcon membrane but there could have been air trapped between the two. Also, since the flow is non-linear in the wet-wet EQ format (as compared to relatively linear flow in the wet-dry format) this will influence the calculation of the hydraulic permeability. The permeability is calculated by applying a linear curve fit to a series of collected data to find the slope; since this data plateaus due to established equilibrium (EQ) and is nonlinear then the current method of calculating hydraulic permeability is not 100% accurate for the wet-wet format.