I’m having trouble getting the PDMS to cure on the NC. When I first started these experiments in August, the PDMS seemed to cure on the NC without a problem. Now, when I remove the PDMS + NC from the oven, after heating for 2+ hours at the highest setting, I notice that the PDMS…
This is the original contact angle study performed using the DeLouise Lab’s Rame-Hart contact angle measurement tool. The entire study was performed on 8/1/06-8/10/06. Observations: Contact angles of non-plasma oxidized samples start ~60 degrees and increase over about 10 hrs to ~75 degrees. Keeping the samples in diH2O halts this gradual increase. Plasma oxidized samples…
There’s been a flurry of activity regarding Jess’ recent discoloration post. Specifically, there is a discussion about the recent materials changes that have taken place due to the rebuilt CVC sputterer. This post is meant to supplement the ongoing materials discussion. I have noticed that films deposited post-rebuild seem to have less background texture and…
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…
I mostly finished re-processing the images with new method of using pore processor. The images of molar flow/porosity dependence with older and newer processed data are below. Older image: New image: They don’t look much different. Also you can not compare them point by point because the porosity is different for both images after re-processing….
In yesterday’s post I showed that I was able to obtain good negative adsorption assay results, but there was one major problem. The cellulose and PES actually had higher protein concentrations after the assay. I suggested this was because they are drawing in water to some extent, but protein was not able to pass through…
The Tecan Nanoquant plate is amazing. For those of you who are unaware, we were able to demo a quartz plate that enabled absorbance measurements with only 2ul drops. It took a little bit for me to figure it out, but it really is a great tool for this kind of study. The ultra low…
I did a quick experiment in order to show everyone what the Tecan allows us to do. I made a dilution curve of rhodamine 6G in PBS and measured the absorbance and fluorescence with the fluorimeter. I first did an absorbance scan and found that the maximum absorbance was at 530nm (panel A). Then I…
Creating an array to hold a pnc-Si wafer to proving to be difficult. The PDMS spreads too rapidly though the NC to form a consistent array for the pnc-Si membrane (and eventually wafer) to rest on. I’m still running different trials of the PDMS on NC to see if I can get the array to…
Last week, we created a series of wafers that were RTPed at four different temperatures between 900 C and 1000 C. Below is a comparison of the 900 C (left) vs. 1000 C RTP (right) wafer. We see that a difference of 100 C shifts the cutoff ~10 nm. The pores are also the roundest…