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Burst Pressure Tests of Annealed and Unannealed SiO2 Membranes
Overview I burst pressure tested TEM chips with 1×1 mm windows of 100 nm SiO2 that were both annealed and unannealed (provided by JP and Josh Miller). In our experience it seems that the forming gas (H2/N2) annealed chips are stronger and never wrinkle. These burst pressure tests were performed in an attempt to…
Mtg with INT
Karl and I went to INT to meet with Mike Connolly and Rick Murante for preliminary discussions on the PFI project. Our role as proposed in the grant is to provide membranes capable of eliminating false positives by using ~20nm pnc-Si to reduce contamination. Here’s a link to an INT video showing their process and prototype. (4…
Cell Adhesion Study (on silanized surface)
We have seen before that silanization slows down discoloration and hence prevents membrane degradation. In Sepcon, the sample should last over a week. Further, it was necessary to check whether silanized surface supports normal cell growth. Therefore, comparison of cell adhesion on aminosilanized surface is made to control surface (non silanized). I took samples from…
concentration curve for PBS + Rhodamine
I mixed made solutions of PBS and Rhodamine with varying Rhodamine concentrations and ran them through the spectrometer. Below is the concentration vs absorption curve I made from it. I blanked the spec with PBS instead of ddH2O since the solution is in PBS. The slope is almost double for Rhodamine in ddH2O compared to…
Carbonization is temperature dependent
Last week I ran a series of membranes through the carbonization process at four different temperatures (600, 700, 750 and 800 C) at a fixed acetylene concentration (1 LPM). As expected, the growth of the carbon ring around our pores is temperature dependent. Note: image processing was done on 100 kx micrographs with the exception…
SPIE Photonics West BiOS Conference Presentation: Rapid detection of intact SARS-CoV-2 viral particles using silicon nanomembranes
This year we were invited to submit a manuscript and presentation to the SPIE Photonics West BiOS Conference. We submitted both on the work we have done on the uSIM-DX virus sensor platform. Below I have attached the presentation which I presented. It summarizes the motivation behind our work, current testing capabilities, introduces our membranes…