I obtained gold in 5nm, 20nm, 40nm, and 60nm through Mort/Oberdorster Lab.  Separations were performed with fully crystallized samples from SC 073.  Here are sizing and absorbance data: In Water I have tried 24 hour separations in diH2O (SC 073)…

Our setup copied Jess’s well in a Teflon block. The chips (SCO21) sat over the well filled with 50 ml buffered (pH ~ 6.0) NaCl solution. On top of the well Paul placed a 20 ml drop of the same…

I set up separations of 5nm Au nanoparticles in both H2O and KCl in a new system.  The stir cell isn’t always reliable for separations due to leaking and contaminating (?) particles from the plastic.  To perform these separations, I…

These are a couple of figures that may appear in the supplementary materials for the permeability paper. The first tries to explain that most of our permeability is due to the largest pores.  The lines plotted are the cumulative number…

We now have a linear standard curve for sodium fluorescein (Na-F) in clear 24-well plates.  What is the detection limit? The detection limit is defined as the lowest background-corrected concentration that is 3 standard deviations above the noise of the…

Charles designed a macro for excel to represent the data gathered from wafer characterization, in a visual format. It is built on VB platform and runs off Microsoft excel. The data is input in a simple fashion by selecting the…

Now that we have preliminary transport data from the Tecan, we need standard curves in order to get permeability coefficients. This is really tricky because the RFU (relative fluorescent units) are arbitrary and based on the Tecan gain. For example,…

A study of membrane deflection has been conducted using the Veeco Wyco optical profiler. This is the first time the Veeco has been used to obtain quantitative data describing membrane deflection. This type of analysis will be useful for several…

The question arose last week about the affects of transport with use of the shaker in the Tecan, which led to a discussion about the current construction of the sepcon. The sepcon layout currently is as follows: The o-ring is…

All of this talk about Zeta Potentials, electro-osmosis and electric double layers got me thinking about these phenomenon in relation to discoloration.  We’ve known that salts accelerate discoloration, and we know that bicarbonate solutions accelerate discoloration as well.  I explained…