Last week the rotation stage broke in the middle of a deposition. The wafer came out looking very non-uniform, and judging by the color of the film there was at least a 10 nm gradient. Since I’m not sure when…
Category: NRG
Temperature series w/ 20 nm & 40 nm oxide
Last week, a RTP temperature series was performed on 15 nm Si membranes with 20 nm and 40 nm oxide layers. The purpose of this study was to 1. evaluate the effect of a thicker oxide on pinhole density and…
Posted in NRG
Terminology
There has been some confusion lately with what we should name the compartments in diffusion. Here’s what I’ve come up with: Top/Compartment with initial sample: Retentate Bottom/Compartment to which things diffuse: Dialysate The original word we were using for dialysate,…
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Test Run of SepCon Format
SepCon Experiment (Carrie): Does it work in a SepCon format? Use “Protein A Beads and IgG Binding and Filtering (with SepCon Format)” 9/29/09 Make Buffer B at pH 3 9/30/09 1) Rinse off ethanol 2) Add IgG Take absorbance reading…
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Test of Theory– Can we successfully bind Human IgG to the protein A beads and then remove it with buffer B?
Test of Binding/ Unbinding (Carrie and Barrett): Test to see if we can successfully bind Human IgG to the protein A beads and then remove it with buffer B. After ordering the new human IgG and protein A beads, I…
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Determining hardness of porous silicon films
I have attached (I hope) a paper one of my students and I wrote a long time ago on the hardness of porous silicon films vs. porosity etc. The references is Duttagupta,…, and Fauchet, Solid State Commun. vol 101, pp…
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The Whitesides Chamber implemented in the McGrath Lab has now successfully generated a steady and linear gradient
Hi all, After nearly a month of troubleshooting the fabrication of Whitesides Chamber we finally have the capability to generate a steady and linear gradient of molecules. In the presented case, we have generated a gradient of rhodamine 6G (R6G),…
Posted in NRG Tagged with: characterization, closed flow system, diffusion, diffusion cell design, flow cell, henry, micropump, rhodamine diffusion
Membrane Edges with SEM
I was motivated to scan our membrane edges after looking at this image from the paper Maryna presented last week: I found a couple of pnc-Si samples with membranes still attached to the edges. I also found one sample with…
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Monitoring Diffusion to Equilibrium
In this post I show the sieving coefficients of simulations with a thin membrane, a thick membrane, or a no membrane case as they approach equilibrium. The simulations were carried out for 48 hours, and plotted for 1 hour time…
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Young's modulus of pnc-Si determined by the bulge test
Initial studies into the mechanical properties of pnc-Si were carried out using the “bulge test”. With JP’s help, we’ve collected a large amount of pressure-displacement measurements. This technique has been used to investigate thin film membranes suspended over windows of…
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