Continuation of the work with the Borkholder group (see this post). We put together a couple of videos of EO flow in the streaming potential cell today.  Runs were performed using Ag/AgCl painted wires at ~2.5 V.  Lower voltages weren’t…

Last week, I did another two wafers with different top oxide thicknesses to verify my hypothesis about the top oxide thickness effect on pores. The wafers were 20/15/03(bottom/middle/top) and 20/15/40. According to the hypothesis, the porosity of 20/15/03 would continue…

A long time ago, Charles did Asymmetrical Oxide Experiment to test how the asymmetrical oxide affects the pores, see Asymmetrical Oxide Experiment. He deposited three structures, which were 40/15/40, 40/15/20 and 20/15/20. It showed that when the thickness of top…

This is my attempt to summarize where we are with our investigation into the use of membrane arrays in high throughput screening. The effort is known colloquially as the ‘Harold Smith Project’ because the model protein system comes from Harold…

Today I brought membranes and the streaming potential device to David Borkholder’s lab at RIT.  His students and I set up an initial low voltage experiment.  They will continue to test the device for flow rates and back pressures.  Here…

In the past, we have seen allyl alcohol treatment on silicon chips helps retain a low contact angle longer than a purely plasma treated sample does. This helps us maintain gold flow in a sepcon format for a longer period…

In this post I look at our membrane resistance and compare it to the best performing alumina membrane. Here is the resistance figure I made for the paper: This figure shows the device resistance with and without a membrane.  The…

We ordered quantum dots from Invitrogen.  These QDs have a PEG coating that terminates in COOH and should cause the dots to be negatively charged.  They are about 12.6 nm in diameter: They exhibit a -40mV zeta potential by zetasizer…

Small DNA oligomers behave like stiff cylindrical rods.  They have both rotational and translational diffusion, and this is of interest when considering how such a rod will diffuse through a nanopore.  In this post I briefly consider the effects of…

The paper that came out from Shigeru’s laboratory earlier this year in Analyitical Chemistry (Ishimatsu et al. 2010 downloadable here) demonstrated that the permeability of pnc-Si membranes to small monovalent ions in 0.1 M salt is predictable from membrane geometry…