These are low burst results but samples have lots of pinholes on them many of which are on the edges.
I also checked porosity of the wafers 338 and 340. They indeed have porosities close to 7%.
Wafer 340 (0,5) 0.0656 porosity
UPDATE: I have since ported the program into Matlab. If you open the following zip document(Archive) you can run Find_Sieving_Coefficient. You can select a results file and after ~5 minutes the expected sieving coefficient for the pore distribution is spat out. Using Wolfram Alpha’s Mathematica programming language, I’ve implemented an amalgamation of different mathematical models…
Hi all, A while back (in the link below) I have posted the analytical solution that allows us to solve the flow rate distribution in our shear-free system. shear stress reduction via pnc-Si: analytical solution However we do not have a closed-form solution at that time. After a brief discussion we believe that there should…
Last week I mentioned that a two step anneal may help with the tears that are forming on the membranes when they are annealed post-etch. The recipe I used was a 10 C/s ramp to 600 C, hold 60 s, 10 C/s ramp to the setpoint, hold 60 s, ramp down. I annealed membranes with…
I recently received wafer 567 from Dave for cell culture work. It has many intact membranes but is riddled with pinholes, having only 3 pinhole-free samples. I decided to test them for air permeability and burst pressure, shown below. I also noticed some odd features on the membrane and surrounding Si. They are circular but…
This post is not an update on my research. I am creating this page to house download links to the COMSOL Multiphysics models I’ve constructed in the course of my work here in the McGrath Lab. This page is linked to in my thesis for legacy purposes. Important: these files have been uploaded with the…
To prepare the BBB devices for cell culture, they must be sterilized. To that end, I wanted to see if there were any adverse effects from autoclaving the device. Recipe 4 on the U of R autoclave is a dry process that we use to sterilize tips, so I used the same recipe. I placed…
