Another set of images of both sides of a membrane, this time something weird is happening… It looks as though I’m missing some holes from the top side. They looked to be filled in but are not when seen from the back. Here is the backside of the wafer showing a bunch of holes. (the…
While JK has been processing backside images from 50 nm, 75 nm, and 100 nm membrane SEM images for pore information, I thought I’d take a look at a 100 nm membrane from both the front and the back at the same spot. Here are the images referenced to a corner of the trench. The…
These are the sieving curves for 50, 75, and 100 nm NPN membranes. The 75 nm NPN 30 nm gold data point is just an estimate, since the membrane broke before enough filtrate could be collected for an absorbance measurement. However, our estimates of zero gold tend to be pretty good (gold is very visible in solution,…
Here is a better, more thoughtful, attempt at pore processing of a single image of the backside of a 75-nm thick membrane (four slot). One thing you will note that could be different from the analysis of the frontside of the membranes: The small openings that appear quite sharply defined here could be missing from the frontside…
While I have been in Montreal with Albert Kamanzi and Sabrina Leslie, Albert mentioned to me a cleaning protocol that appears to strip off NPN. 5 mL of Hellmanex III in 100 mL of DI water Placed in heated water bath, covered with parafilm (setting 50C, actual 40C) for 2 hrs Delaminates NPN? The chips are mirror-like afterwards, indicating…
All of the images are from the same 75 nm NPN four-channel chip. The first images shows the edges from the backside of the chip, showing how flat it is (without the oxynitride present on the top side). There is a crackle-like texture but the third image, which shows the corner of the membrane and…
Over the course of this past year and 3 months, I have been on a long and perilous quest to reproduce data that I obtained during my rotation in the McGrath Lab. Specifically, I was looking to capture exosomes in the pores of our membranes, as I showed in my post here (See the last figure…
Hey all, Here’s my thesis: ksmith thesis I filmed the public portion of my defense and posted the video to youtube. I’m not leaving till the end of the week, and I’ll be back for a week in mid-May as well as being generally around Rochester this summer (this isn’t goodbye!) but my permanent email address…
Hello everyone, this post is a summary/recap of the MRS Spring meeting that was held in Phoenix, Arizona this past week (April 17 – 21). Here is an overview of two sessions: Molecular and colloidal plasmonics – Synthesis and applications (ED14) Jennifer S. Shumaker-Parry, Associate Professor at University of Utah (http://shumaker.chem.utah.edu/) Combined top-down/bottom-up for the fabrication…
The x-values are based on TEM images of the last populations of gold nanoparticles (I think. I can’t remember immediately when the fridge died on us). It’s probably worth re-doing that with the new gold vials. There’s still some work to be done. In the 50 nm NPN, 5 nm gold was only done once,…