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.
Two simple diffusion separations were performed before break using membranes from wafers 205 and 213 (locations unknown as these were salvaged/misplaced chips). I ran the samples I collected on a 10% SDS-PAGE gel today. It seems that the membranes were able to separate the standards at two different cutoffs. The missing band in the middle…
There is strong evidence that the recent pinhole breakout is due to copper contamination in our process. I have attached two image – An SEM showing a cuprous creature eating one of our membranes and an EDX (Energy Dispersive X-ray?) spectra identifying it as a copper-rich silicide. This would also explain Dave’s TEM image of…
Just in case you missed this one: www.nature.com.ezp.lib.rochester.edu/nnano/journal/v2/n11/full/nnano.2007.354.html This article makes the the previous papers seem mundane. It has inspired me though – maybe we can create a computer simulation that will demonstrate that pnc-Si membranes will dance and sing songs under the correct conditions. I will leave the choice of genre to the programmer…
I stripped and viewed samples from wafers 186, 185, 184 and 182. None of these samples had cigarette burns. Follow this link to the updated summary: cb_report Previously I had noticed cigarette burns (small ragged pinholes) on samples from wafers between numbers 202 and 216. All of these wafers had been stripped using a full…
This is a 12% SDS-PAGE gel of the human albumin (alb) and cytochrome c (cyt c) EQ tests. Both alb and cyt c passed through the membrane, while the cyt c impurity (middle band) and alb impurities (high bands) did not. The next step? I’d like to try an albumin/IgG separation with membranes of similar…
