Because of the recent discoloration problems I observed with 24 hour diffusion using w670 and 673, I decided to try a shorter time point. 673 had a couple more samples to spare, so I tried an 8 hour diffusion experiment. …

I got some wafers from Chris last week(?) that had undergone different Megasonics cleaning treatments by the manufacturer.  We’re trying to figure out if these treatments are actually cleaning the wafers.  I’ve been having trouble getting the AFM to stay…

While wafers 670 and 673 did not hold up to diffusion experiments, they were strong enough to perform pressurized separations using the pressure cell.  Each experiment lasted for 40min, although the average flow was only about 5ul for this duration.…

I’ve processed all the images used in the water permeability studies and found the following statistics from these images: Mean Diameter Mean Area Median Diameter Median Area Porosity Area Weighted Diameter 90th percentile Diameter I calculated the theoretical water permeability…

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…

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…

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…

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…

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…

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…