5nm BSA-Au appears to be 12.7nm.10nm BSA-Au is 18nm. Dilution dependent size change of 5nm BSA-Au. One theory for the size change was that residual BSA was combining with the Au peak and for some reason dilution of the BSA was causing a migration of the peak. This doesn’t necessarily make much sense as the…

The Ozone generator works very nicely. Dave is going to be providing an in-depth user manual for us, so I’ll be somewhat brief. In this first picture, I compare an ozone treated sample against a control. Both ‘droplets’ are 3uL of DI water. The treatment protocol:– 3 min of O2 at to fill main chamber,…

I tested five types of track-etched membranes (with pore diameters 0.1, 0.08, 0.05, 0.03 and 0.01micron). All of them are 6micron thick and usually have 14-16% porosity. First experiment was to confirm the official air flow rates data with our setup. The measurements are taken at 10psi (as the ones that company did). The results…

These are low burst results but samples have lots of pinholes on them many of which are on the edges. I also checked porosity of the wafers 338 and 340. They indeed have porosities close to 7%. Wafer 340 (0,5) 0.0656 porosity

w312 Number of Pores HistogramContributed Area Histogram 5nm BSA-Au is detected in the filtrate after 24 hours. 10nm BSA-Au is not. The 5nm registers around 10nm after conjugation and the 10nm is closer to 15nm. This selected membrane is not very porous, although it does have pores (as high as 42nm) that would appear to…

Wafer 403 was processed last week using the new thermal oxide/TEOS steps outlined in the previous posts. I took images from six positions at different radial positions on different axis. All six samples looked relatively uniform! (1,0) – 35kx (0,-2) – 35kx (3,0) – 35kx (4,0) – 35kx (0,5) – 35kx We know that the…

Directory containing article and presentation Nature Article about Willem Kolff

Theoretical molar flow is calculated for membranes with different porosities and is based on data extracted from TEM images using Mike’s program. Experimental data is calculated using air permeability test results. It is associated with porosity only through TEM data. Correlation between two is very good but some points do not agree. One of the…

I figured I’d throw this up in case anyone needed to know how to order anything… enjoy. http://docs.google.com/Presentation?id=ddfnw7hd_235d2f4v4f5

I have uploaded the TEOS process outline: TEOS is tetra-ethyl-ortho-silicate, or equivalently tetra-ethoxy-silane. TEOS slowly hydrolyzes into silicon dioxide and ethanol when in contact with ambient moisture. IMPROVEMENTS: -This process prevents us from having to expose the front-side of the silicon during processing. Concurrently, this eliminates the need for aggressive cleaning of the front surface…