I have been exploring the efficacy of different methods for removing the native oxide from the surface of the sacrificial silicon layer prior to liftoff etch with XeF2. As a reminder, with liftoff of SiN membranes, one can simply dip the sample in BOE solution for a few seconds to strip the native oxide. This…
A change in open-circuit potential, measured across a pnc-Si membrane, in response to a fluctuation in flow rate of electrolyte solution exhibits a promising flow-sensing capability of the membrane. To demonstrate this correlation, the open-circuit potentials were measured under a variety of pressured-driven flow patterns. In Figure 1, a series of flows under various applied…
The purpose of this study was to characterize pore sizes on Aquamarijn (Aquamarijn Membranes B.V., the Netherlands) membrane chips. Membranes provided to us by Aquamarijn have a design specification of 450 nm pore size across 14 windows in the chip. Chips were sputter coated with gold particles at 20 mA for ~60s after which SEM…
On Wednesday Feb. 12 and Wednesday Feb. 19, limited exposure dialysis was performed on rats. In the first experiment, blood was pumped with the peristaltic blood pump through a two-chip dialysis device in an acrylic fixture. The membranes were non-porous silicon nitride so no dialysate was included in the experiment. Blood was successfully pumped through…
We received W648 from the production team this week. Upon inspection of this wafer, is has a higher density of pinholes than we have been seeing lately (>3 pinholes/slit compared to 0 or 1/slit) and seems to show a return of contamination, shown below. This contamination is visible over the entire wafer, but is easiest…
During the history of pnc-Si fabrication, we have always observed that pore formation is intimately related to the crystallization process. In general, large nanocrystals in a film correspond with larger pore diameters. A partially crystallized film will have a low density of films. Following the work that describes crystallization of a-Si in terms of kinetic…
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It’s not just that dimers can survive the SDS, it’s that there’s “an equilibrium between monomeric and dimeric cyt c in the presence of SDS” – this is shown in figure S1 curve F and G. Adding SDS to purely monomeric solutions makes dimers, adding it to purely dimeric solutions makes monomers. This means we can’t clean up the figures by simply starting with a more pure solution of monomeric cyt c.