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I am working with different electrode materials as a substitute for ITO for my TEER measurement device. I used silver-silver chloride electrode and platinum-iridium ribbon (90:10) for that purpose. I made AgCl electrode by dipping about an inch of silver wire in silver chloride ink and letting it dry for half hour. I obtained the…

The purpose of this post is to see if there is a pattern in the Pore Density vs. Pore Radius graphs at certain manufacturing conditions. The following wafers all have widths of 15nm and RTPs of 1000. The porosities range from 6.48% to 8.33%. **** note: the y-axis label should actually read “pore density (#/nm2)”…

As Greg posted last time, he and I have been working on a manuscript for all of the tomography stuff that we have done that we are going to hopefully submit this week. In that paper, we covered all the tomography techniques that Greg uses to reconstruct models of the pores and then used these…

Bill Bernhard’s group approached us about using pnc-Si membranes to separate DNA species by diffusion.  Bill’s lab studies the effects of ionizing radiation (ex. X-rays, gamma rays, UV light) on DNA using electron paramagnetic resonance (EPR).  There are three major species of DNA that they wish to study using our membranes: short oligonucleotides, larger supercoiled…

Wafers 670 and 673 were made to have different cutoffs. I set up diffusion experiments with two chips from each wafer using protein standards. However after removing samples after 24 hours I noticed that both chips from w670 had fully discolored and the chips from w673 seem to have partially discolored. In all three cases…

This is a follow up to Josh’s post, “Continued Au Separations with SiN-NP wafer #’s 1029 and 1030”, and seems to explain why we initially got an S value greater than one during our gold separations. We conducted tests to see if the colored centrifuge tubes were at fault for our seemingly large filtrate absorbance…