The electrical properties of 20nm and 50nm thick sputtered oxide is currently being investigated. Capacitance-Voltage (C-V) and Current-Voltage (I-V) tests are achieved by fabricating 200um-4kum diameter capacitor “dots” using Lesker SiO2 targets and flash-evaporated aluminum (CVC). A GCA stepper is also used during photolithography for 5X image reduction. The purpose of the experiment is two-fold:…
Over the past month, I’ve posted some results of a colorimetric assay for silicic acid. Previous posts are here and here. These results showed that the assay detected silicic acid after pnc-Si and PSi degraded. However, bare silicon wafers also yielded silicic acid, according to this assay. Since pnc-Si samples have the Si well-side surface,…
Roundness vs. Equivalent Diameter plots for five eccentric wafers: There really doesn’t seem to be a correlation between equivalent diameter and roundness. However, there does appear to be a rough downward trend in SC 016 and SC 258. Mean Roundness vs. Wafer Number graph with error bars included: Without the error bars, it looked like…
Here are the updated pore processing graphs: The data spreadsheet: pore-processing-results Supplement (added 6/16/09): Here is the Average Pore Size vs. Porosity graph with the outlying data points labeled: After making this graph, I looked at the outliers to see if they were due to my errors. A few were and I redid them, updating the…
In an attempt to minimize flow due to salt gradients, we ran an experiment in which an intentional gradient was used to set up a slight counterflow from the filtrate to the retentate. This was accomplished by having a 55mM NaCl concentration in the retentate and a 45mM NaCl concentration in the filtrate. The top…
I continued work with a couple of new wafers and settled on one that lowered the cut-off to between 5 and 10 nm gold particles. For completeness, I will also include some of the old data that has been further analyzed. All experiments were performed with BBI stock gold solutions (0.01% w/w?) diluted 1:1 with…
I had some old carbonized samples kicking around and decided to do some high res TEM yesterday to see what a completely occluded pore looked like. Below is an image showing a blocked pore and adjacent Si nanocrystal. Inside the pore, you can see concentric “rings” of carbon atoms i.e. graphene sheets? Here is a…
I took a look back through the Melvern data I collected, particularly focusing on changes in the intensity data in the BSA-DDM solution (the previously posted plots were of number data). When I compared the peak intensities for BSA, DDM, and DDM-BSA complex I noticed that the intensity peaks fall over the same size distribution…
Yesterday I used the Melvern to determine particle size and zeta-potential for BSA in DI-water. For the particle sizing I used a concentration of 2mg/mL but I had to increase the concentration to 10mg/mL in order to get an accurate zeta-potential measurment. As shown above the size measurements provided an average diameter of approximately 5.6nm….
This previous post contrasted how gold could be separated by pressure in deionized water, but not by diffusion (w199). I checked up on that diffusion sample again after 6 days, and while the retentate had mostly evaporated, there was no gold within the remaining filtrate. As you may recall, there has been some discrepency with…