UPDATE:Chris took the membrane sample and normalized with by the no spanning membrane sample. This was plotted against the theoretical spectrum of single crystal silicon. The curves have a similar shape, but the single crystal silicon has lower transmission. This may be due to the fact that it’s a perfect material or that there’s error…

I treated samples from w312 using our ozone equipment. Quickly, here was the protocol:Place samples in chamberTurn on O2 and supplemental Ozone generatorAfter 3 mins, turn on Lamp in main chamber for 5 mins (Heater set to 110C)Leave samples in chamber for 15 minutes after timer turns off(O2 and supplemental Ozone should still be on)Turn…

Here are images of actin filaments on Formvar coated 200 mesh nickel grid. Actin filaments were polymerized exactly as before. TEM sample preparation procedure is: 1. add actin solution on Formvar grid and wait 90 sec 2. remove liquid, add same volume of 2% UA and wait 90 sec 3. remove liquid and load on…

Last week I attempted to use the ozone cleaner and RTP to grow an oxide on bare 4″ wafers. I used the spectroscopic ellipsometer to measure the film thickness. I found that ~4 min. in the RTP @ 1150 C with 3 LPM of O2 grew nearly 50 nm of silicon dioxide. Using Tom’s standard…

Production this week yielded mixed results. We ran eight wafers through four different RTP temperatures with/without the susceptor. We wanted to test our theory that temperature non-uniformity inside the chamber was causing the morphology change across the wafer. This proved to not be the case! Wafers that were treated with and without susceptor showed the…

Last week I reported wafer 403 showed uniformity across all positions but had a huge amount of pinholes. Wafer 404 (TEOS process & thermal oxide base) was initially annealed at 1000 C and then annealed again at 1000 C for 5 minutes in the RTP. The second anneal helped with the sputtered oxide film quality…

Because our membranes are not mono-disperse, we often debate the relative contribution of large pores vs small pores in both diffusive and convective separations. Indeed it is possible that the way pores contribute to transport in these two modes is different and would give rise to different fractionations of the same sample with the same…

I think some of us have been confusing each other in our discussions of the dependence of flow rate on pore radius. Jim thinks in terms of a single pore, and I agree that there is an r^4 dependence. Therefore, if you double the pore radius, flow would increase 16X with everything else being equal….

15um beads on discolored membrane surface, having some slits where the beads are not found The localization of microbeads suggest that they have fallen across the slits in the membrane Transparent membrane with microbeads on its surface These membranes are not treated with cell media, hence are not discolored. There’s a slit which appears to…

Dave and I characterized the membrane samples using the 4-point probe system at Kodak research Lab. It is NOT the previously discussed micro-4-point probe. The spacing between two probes is about 2mm. We first tested a quarter bare wafer#388 at five points (see the diagram below). The average sheet resistance is around 80 ohm/square.sites (1)…