Congrats Dave!

Because the Barcikowski lab intends to use the nanoparticles they sent us, relatively high yields are necessary for any step that cleans them up. This is unfortunate, because in every single separation that we’ve done (with one exception mentioned further on) we never see yields higher than about 5%. We’d thought that the problem was…

Here is an attempt at the active area figure using the “newer” EO membranes (SC172).  Here is the raw flow data for the three membrane sizes: If we take the slopes from this figure, we get the flow rates in uL/min.  We can then plot against active area: We get a pretty nice fit here,…

Hello Everyone, So following up on my exosome scale experiment and my last post, i am presenting my last update to summarize my results and to show that my results are trustable and reproducible. This is how we take images: We have different positions in the interaction area, and we take images as the experiment…

Using wafer 302 I set up 2 20nm and 2 50nm gold diffusion experiments. After 24 hrs I removed the retentate and filtrate and looked for the gold using the Malvern Zetasizer. We can’t perform the diffusion with both 20nm and 50nm gold because the Zetasizer cannot differentiate between the two sizes. r value Sample…

This previous post contrasted how gold could be separated by pressure in deionized water, but not by diffusion (w199).  I checked up on that diffusion sample again after 6 days, and while the retentate had mostly evaporated, there was no gold within the remaining filtrate. As you may recall, there has been some discrepency with…

Last week Sarah and I made several standard nanofluidic transistor (NFT) stacks (3 nm Ti, 12 nm Ag over a 3-slot SiN membrane – wafer # 1024) in the cleanroom. I then measured the zetapotential of these devices at pH 7.43, and we thought that because the outer layer of the chip was Al2O3 that the…