In a first attempt to reduce the electrostatic drag that might be slowing water transport, I ran an experiment with 1x PBS. The membranes were first ozone treated and then assembled into the SepCon inserts.
From these first trials, it appears that PBS does pass through more quickly than DI water.
The objective of last week’s production was to track down the source of Cu contamination. The good news is that none of the wafers showed signs of Cu. The bad news is we are not sure why it has disappeared all of the sudden. Chris and I observed that there are particles in the well…
The Ozone generator works very nicely. Dave is going to be providing an in-depth user manual for us, so I’ll be somewhat brief. In this first picture, I compare an ozone treated sample against a control. Both ‘droplets’ are 3uL of DI water. The treatment protocol:– 3 min of O2 at to fill main chamber,…
A new user in URnano has used the “old” susceptor for a ~270 C (I might have the exact number wrong, but it is relatively low temp) to heat In on GaAs. I don’t think there was ever a good reason for using the RTP for this process, but what is done is done. I…
As a follow up to my previous post, I would like to present some preliminary data on the subject of endothelial cell alignment under shear stress with variable substrate stiffness. The flow set-up (Figure 1) allows for steady flow across the membrane on which the HUVECs are cultured. No Gel HUVEC Alignment Alignment of HUVECs…
The process to create free standing films of MgF2 requires the film stack to survive a few different kinds of stresses. First, there is thermal stress from the mismatched coefficients of expansion (MgF2 expands about 5-10x more than silicon/silicon nitride), the stress of deposition (adatoms not finding their lowest energy position), and other mechanical stesses…
Barrett Chamber Flow Visualization For my lab rotation here, I was tasked with visualizing the flow of blood/blood-like objects across the 1st generation Barrett chambers. The design of the chamber is seen below. Some key characteristics are that the chamber is suspended from resting flat on a surface to allow liquids to diffuse through the…