Here is the full updated Adsorption Quantification figure: We were concerned that cellulose appeared to adsorb more than PES when the literature clearly states that it shouldn’t due to its hydrophilicity. We considered that this same hydrophilicity might be part of the problem with our method. Macroscopically, it appears that the protein solution applied to…
After doing all the water permeability with this wafer, I saved the samples to do some protein studies. When I write my own paper I will need two wafers to separate protein standards by diffusion and flow to show movable cutoffs. I will also include a brain extract separation to make the point that you…
So I talked a bit with Philippe today about the water permeability data, and he suggested that I try to see if there’s a correlation between what the histogram looks like and the experimental permeability’s relation to the theory. I pulled out all the histograms and here’s what I could find. Two of the membranes…
I’ve been working on trying to fill in some of the blanks of the permeability paper, and I’ve been fiddling with the water permeability data. I plotted the old water permeability data as a scatterplot, and while there looked like they could be a linear relationship with porosity, it was definitely missing some medium porosity…
I realized last week that I had made a pretty substantial mistake with my quantification which involved my mass standards. Half way through running the gels for the previous study I had accidentally started making my mass standards at a higher concentration but counting them in the quantification as their initial value. The bottom line…
We’ve built a set up for this but it’s not incredibly user friendly right now. It consists of a camera and a stage. Using the macro function of the camera you can take a close up image of the chip, but you must make sure the horizon line is straight i.e. camera and stage are…
I took a sample from w304 over to the Krauss Lab and had them try to image it with AFM. Here are a few pictures (for some reason the color scales weren’t included in a couple of them, but they go from 0-dark to 5-light nm): In both images you can surprisingly see the pores….
Recently I tested track etched membranes and crystalline silicon (basically the backside of the membrane chips) following the sample buffer adsorption assay. This new data comprises the last two bars on the following chart. I’m surprised to see that crystalline silicon is so low in comparison to pnc-Si. This is something I’d like to test…
At Nanotech I met a professor from Geneseo, K. Yokoyama, who worked with gold in sol-gels. He found he was able to dissolved gold in sodium tetra bromate (Na2Br4O7) without it aggregating. I have attempted to dissolve gold in other salts to no avail. This is an important step in testing membrane separations with gold,…
This week I went back and took a look at this figure. In the previous incarnation, when prewetted, PES dropped down in adsorption much less than cellulose. I decided to retry this sample and keep in mind some of the things we have learned since then. I was careful to expose both sides of the…