In my previous post on applying voltage to a silver-coated NPN chip, I put up a video which, if you squinted and were willing to be charitable, showed that I could modify the EO pumping behavior of the chip by applying 2 V to the membrane. I repeated the experiment, and I think I can…
After seeing my previous post on modulating EO pumping behavior with an applied voltage, Jim asked if we could use pnc-Si as an Ultrasound generator. In the following video, I gave it a shot: MVI_2604 (relevant points from the video: a square wave of +/- 10V applied across a pnc-Si membrane results in apparently instantaneous…
Because I’ve been having such a difficult time measuring consistent zetapotentials (a big and heartbreakingly inconclusive post on those efforts is forthcoming) I decided to use one of my silver-coated SNMs as an EO pump and see if changing the voltage applied to the membrane changed the rate of EO. And I’m very happy to…
In April of last year, I spent a considerable amount of time trying to visualize protein separations using SDS-PAGE (Sodium Dodecyl Sulfate-PolyAcrylamide Gel Electrophoresis) gels, and ultimately was able to get some data: I was trying to show that 15 nm pnc-Si could be used to separate BSA from cytochrome c, and while at first…
Over winter break I put together some posters to hang up in the lab. I tried to represent in an clever way a few key areas of research that NRG is interested in: If anyone has any ideas for more, or any suggestions for captions or improvements (I’m really not a fan of “At…
In all of the below graphs, the x-axis has the same scale for easy comparison (-10 nm to 80 nm diameter). The Y-axis varies from plot to plot, but since we care more about pore density than actual numbers of pores, I have left these numbers out. Here is an example full plot with MATLAB’s…
In the field of gas permeance there is a plot called the “Robeson Plot” (the paper that debuted it) that is used to compare the separation behavior of various membranes made of different materials and measured in different systems. An example is pictured: Various literature data for the log permeability of H2 gas versus the…
In my continuing efforts (previous post) to create a nanofluidic transistor, I recently repeated some of my earlier attempts to prototype a basic Si-Ag-Al2O3 stack. This time, however, I used SiN chips from wafer #1070 (<40 nm>). As before, I aimed for a ~3 nm Ti adhesion layer (4.3 nm actually) and a 12 nm…
In this post I’ve detailed my attempts and eventual success (with Josh’s help) to get the ALD to coat TEM grids without blowing the delicate chips around. The actual technique is at the end of the post, beginning with the picture of two valves. We use the Cambridge Nanotech ALD system for two purposes. First,…
On Friday, Henry was kind enough to ship 15 tested Sepcons to the Barcikowski group in Essen, Germany. With luck they will arrive in time for Christmas. I wrote up some documentation and an illustration for wetting and using the Sepcons and figured I would share it with the group. Unfortunately, wordpress won’t let me…