PhD Committee Meeting and Internship with Sartorius

Last week the rotation stage broke in the middle of a deposition.  The wafer came out looking very non-uniform, and judging by the color of the film there was at least a 10 nm gradient.  Since I’m not sure when the motor stopped, it’s hard to say if the underlying oxide is non-uniform as well,…

I am trying to deposit metal on the membrane with minimal deposition inside the pores. The image below is an example of how the film quality and thickness change when the sample is positioned at different angles and distances from the source in the same deposition run. The schematic in the corner of each SEM…

Recently we were interested in finding out how many particles from our immobilized graphene oxide (GO) nanolaminates are delaminated into suspension due to shear stress. We wanted to compare this concentration to those found in our previous hemolysis studies to determine if the delaminated particles would lyse red blood cells. In order to determine this,…

20nm polystrene beads in 1x PBS passed through w218. This wafer looks a little strange, like it was not fully etched (Dave do you know what happened to this one?). This was just a first stab at the benchtop diffusion with PS, so I didn’t use a “good” membrane. At any rate, the PS went…

Last fall we decided to try to integrate a filter immediately upstream of Vincent Tabard-Cossa’s nanopore DNA sensors. The idea is to assemble back-to-back a NPN membrane a standard nitride membrane used in Vincent’s nanopore fabrication system an oxide spacer. Currently the lifetime of these sensors/sequencers is limited by clogging events. The purpose of our…