Henry’s BMES 2017 highlights

This past year I have been collecting burst pressure data on pnc-Si and NPN. The data for 30nm pnc-Si came from my previous post, “Wafer 1059: Burst Pressure Analysis”, which also includes a wafer map. This wafer had 7% porosity and an average pore diameter of 20nm. I tested square window sizes with side lengths of 0.1mm,…

I re-ran the rhodamine dilutions narrowing in on the molarities within the range readable by the spectrometer. My start sample was .5mM of Rhodamine. The wavelength I set the spectrometer at was 530nm with 3 trials of each dilution. I started with the least concentrated dilution and cleaned the cuvette between every trial so as…

Previous Post on Water Permeability Figure We decided at the last meeting to show water permeability for each membrane used rather than plot for a specific characteristic like porosity.  I did this but there were a few samples that still had a noticeable deviation between experimental and calculated permeabilities.  I asked Dave to reprocess the…

Background For the in vitro portion of our dialysis project here at UR, we have settled on using two major experiments to test our devices for eventual transition to an in vivo model. These experiments include a single pass system using multiple syringe pumps to observe the effects of fouling on our membrane as well…

After seeing in previous posts how optically transparent the SiO2 membranes are, I went about seeing if I could quantify this in comparison to the SiN membranes and also CoStar PET track-etched membranes. In order to do so, I ‘seeded’ red 1µm beads (in 1X PBS) onto each type of membrane (the SiO2 and SiN…

Bob and I have been busy for the last couple of weeks going through the fabrication process with the hopes of SiO2 membrane liftoff. The fabrication process was similar to the silicon nitride membrane liftoff. The process is shown in the figure below. In the beginning, we started with 9 wafers that had thermal oxide…