100K Microcon "duds"
I few weeks ago I posted some flow rate data based on the 100K microcons in which three of the four membranes worked fine and the other appeared to be a “dud”. I pulled the four systems apart and used the digital calipers to measure the membrane thicknesses and found the following.
– The three “working” membranes had thicknesses of about 0.12mm
– The single “dud” membrane had a thickness of 0.27mm
This increased thickness accounts for the differences in observed flow rates and thus the difference in calculated hydraulic permeabilities.
Is there anything funny about the thicker samples? Can you take a look under Brian’s microscope?
Please keep these samples – it may be worth looking with the SEM…