NRG

Surface functionalization results

The graph below shows the burst pressures for302, 303, 304, 307 wafers.

The objective of last week’s production was to track down the source of Cu contamination. The good news is that none of the wafers showed signs of Cu. The bad news is we are not sure why it has disappeared all of the sudden. Chris and I observed that there are particles in the well…

UPDATED 12/12/07 – Added data on albumin. In these gels, the band from beta-galactosidase appears to overlap with phosphorylase b making it difficult to determine which protein passes and which is retained. I have used Mike Bindschadler’s pore imaging software to find the pore sizes of the three membranes I have use to perform succesful…

Here is a slightly enhanced version of Mike’s latest hydraulic permeability data for commercial devices with PES membranes. The data at 22 and/or 34 PSI are a bit strange. Still the long-term trend seems downward. Similar data for PNC-Si membranes should show no pressure dependence. We need to get a version of this figure that…

Just some quick thoughts about the attached excel on my previous post… The 100K nanosep does not have a hydraulic permeability value at 194.65psi because it passed all 500uL of water through in 1minute which is the smallest interval of time a test can be run at with the new centrifuge. When I get a…

I ran some more tests on the microcon and nanosep filtration systems at 21.36psi (4000RPM) and 194.65psi (12,000RPM). Both are rated for forces up to 14,000 time gravity which is about 340psi but after talking to Tom we thought it best to run it at a slightly lower pressure to account for any possible error…

Below is an optical image that shows the amount of area loss caused by the preferential EDP etch. Based on these numbers, our most recent membrane slits measure 115 um x 2014 um.

I found a small mistake in my calculations of the air permeability.Corrected data is in the graph below.

Today I looked at 3 more wafers: w158 (9/7/07) – some pinholes, overwhelming amount of very fine debris, not cbs as far as I can tellw160 (9/7/07) – some pinholes, debris, no cbsw171 (9/26/07) – many pinholes, lots of debris, no cbs w158 (200x) – small particles Link to updated report.