Last week during the deposition step, Chris and I discovered that part of the Cu “power cup” (piece that is bonded to target to make thermal contact with sputter gun) had eroded and coated the inside of the target shield with copper. Later EDX and TEM characterization showed that there was indeed contamination in the…
The deposited metal thickness is 20nm, consisting of 10nm titanium and10nm gold. Post not finished. sc b020 – 25nm sc b011 sc b01
A paper by Munch (from Kodak), Zestar, and Anderson in J Mem Sci (1979) writes that charge has a big effect on albumin separations in track etched membranes. They show in their paper that they can make the theoretical sieving match the results better if they simply add the Debye length to the molecular radius…
This is the first post I have made with respect to the project proposed by Mark Dumont of the department of Biochemistry and Biophysics. As a reminder of the scope of the project Mark has shown an interest in using our pnc-Si membranes to separate detergent from trans-membrane proteins during the process of preparing samples…
I set up diffusion experiments using the wafers that Tom was able to pass gold through in DI H2O using pressure. 5nm particles do not pass in 24 or 48 hours. If we have extra samples I will be testing 5nm particles in 10mM KCl.
This is a reprisal of the old post. While manufacturer declares particles to be 5, 10, etc, they do however give a measured average to their particles in the written material they provide. I did not have that in the last chart. Here I also add the standard deviation of TEM and Malvern data (as…
Last week a set of four wafers was processed at four different RTP temperatures (1000, 950, 900, 850 C). Unfortunately, the yield across these wafers was low due to possible metal contamination in the film and etch issues. However, the TEMs still show a range of porosities and pore sizes across the different thermal treatments….
I have been using MatLab to analyze the pores in the SC wafers. Here are the results from my analyses: To take a first look, I simply plotted four characteristics: average pore size, porosity, cut-off pore size, and mean roundness against the wafer number. Notice that the blue dots are the b wafers. Excel would…
I have been working with Barrett to test two different assays with BSA. One is a standard procedure for microtiter plates and the other is a microassay procedure for microtiter plates. Here is a brief summary of each procedure: Standard Procedure for Microtiter Plates– linear range is 0.05 mg/ml to 0.5 mg/ml Prepare a diluted…
Motiviation and Background: Nakul and I have been performing a lot of DNA filtration and attempted DNA shearing experiments. We found that large DNA fragments (>1000 and >2000 bp) pass through ~30-40 nm max pore size membranes when pressurized to 10 psi (even in low salts). This is in contrast to the Bernhard data where…