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…
Category: NRG
Mark Lifson's Lab Rotation
The goal of this rotation was to create a device to test the electro-osmotic properties of the membrane bound silicon chips. To perform this task, it was necessary to attach two glass pipettes onto both sides of a chip. The…
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BSA diffusion across SC267
Last week I made a post showing detection of detergent diffusion across membrane SC267. In the diffusion set up I had placed 6uL of a 50/50 volume ratio solution of 1.0% DDM and 1mg/mL BSA with 60uL of DI-water on…
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Nanoparticles on pnc-Si and pnc-Si pores via SEM
I’ve been thinking of demos/experiments to do with my upcoming class and one of them is SEM. I was thinking of handing out some unknown nanoparticle solutions and have them figure out the size and maybe material by SEM, AFM…
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Protein Assay Test
Over the past few weeks, I have been trying to separate proteins with the SepCons. As a preliminary test, Barrett and I decided to first acertain that BSA could pass through a membrane with pinholes. Theoretically, the pinholes are so…
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Pressurized Gold Separations – Part 3
Dan Mendelson performed gold separations using wafer 255 and has shown that this wafer has a cutoff for gold near 25 nm. Below I have plotted the data of filtrate gold concentration as a function of the feed concentration for…
Interesting features
In an effort to measure the effects of bsa adsorption on pnc-Si, I made some samples from SC 073 (a good wafer for separations) and with the help of Graham Marsh (Waugh Lab), looked at them using AFM. We did…
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DDM diffusion through SC267
In a previous post I showed that a colorimetric assay using sulfuric acid and phenol can be used to establish a linear relationship between known detergent concentrations and absorbance values. This assay proves helpful in the project related to Mark…
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Pore Density vs. Pore Radius Graphs
This post is a follow-up to Professor McGrath’s post, “Permeabilities vs. pore sizes for ideal membranes.” In the aforementioned post, this equation is proposed: Ψ = Nπr2 Where Ψ is the porosity, N is the density of the pores, and…
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Sputter system update
Last Friday, Chris and I met with Dave Glocker from Isoflux Inc., an expert in physcial vapor deposition. Specifically, we wanted to get advice on the recent problems we’ve had with the AJA tool. Arcing from Lesker targets We recently…
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