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More on porosity vs. position
Last week I took a series of TEM images from all but one position on wafer 638. Below are the TEMs, histograms, and porosities vs. distance from center plots. “Xpos”, “xneg”, “ypos”, “yneg” indicate which axis the images were taken from. Positive x-axis Negative x-axis Positive y-axis Negative y-axis Wafer 638 porosity vs. position While…
Parylene penetration through pores during deposition (AFM)
First, last week I had some images taken with new “visiting” AFM. These were frontside of the membrane with parylene deposited from the well side and the front side with deposited parylene on it. 1-1. Parylene deposition was not successful and although the dummy wafer showed thickness of parylene about 22nm, I suspect the were…
Ultra-Thin Self-Assembled Protein-Polymer Membranes: A New Pore Forming Strategy
I recommend we review this article in NRG or journal club – it was just published online in Advanced Functional Materials this week. I see a lot things in this paper that appear to be motivated by our work. They showed SFM/AFM membrane thickness step height, NP gold separations (and cake formation) and water permeation/permeability. Unfortunately for…
O-ring position doesn't matter
Christine and I have been looking into whether the O-ring position affects transport through pnc-Si transwells. The hypothesis was that the unstirred water layer under the Sepcon might be diminished by switching the O-ring from its normal position (“O-ring bottom”) at the bottom of the Sepcon to above pnc-Si (“O-ring top” or “pnc-Si bottom”). This…
Progress on Wetting Monolith Chips
Kyle has made some progress using the monolith chips, however, the wetting of these chips is difficult and makes the monoliths unattractive to use. I have attempted to create a more replicable wetting protocol. We’ve heard over the summer that other groups have used an autoclave to inundate tiny nanostructures with water (like a nano-scale…
Calculated and experimental molar flow – porosity dependence
Theoretical molar flow is calculated for membranes with different porosities and is based on data extracted from TEM images using Mike’s program. Experimental data is calculated using air permeability test results. It is associated with porosity only through TEM data. Correlation between two is very good but some points do not agree. One of the…