Josh has just started teaching us how to play with these; some early findings: – So far, standard centrifugation results mostly on the caking of lipids that clogs the membranes. – Use of the pressure cell has shown some promise,…

As discussed in a previous post, we decided to test chips from wafer #1070 because they have smaller pores than those used in the most recent forward vs. reverse study. In the forward direction, 31 uL of filtrate was passed…

We still have plenty of things to do, but after five weeks working at the UR, we have come a long way: – Chip production for instructional use:  done – Design and production of SU8 mold: done – Protocols for (@Fisher)…

Last week Sarah and I made several standard nanofluidic transistor (NFT) stacks (3 nm Ti, 12 nm Ag over a 3-slot SiN membrane – wafer # 1024) in the cleanroom. I then measured the zetapotential of these devices at pH 7.43,…

I have a preliminary result from Kevin that there is a layer of fluoropolymer remaining on my MgF2 freestanding nanomembranes (which could explain some of the carbon signal in EDX from my previous posts). This would create another unnecessary signal…

This is the method Brian McIntyre developed for the recent URNano Microfluidics Workshop. Based on a polyaddition-based mechanism based on introducing amine groups onto the surface of one material and epoxy groups on another material and enabling the amine–epoxide polyaddition reaction…

Scott Russell from Mech. E. and Steve Gillmer came over to help Sarah and I try to record the burst of membranes at up to 2000 frames per second.  Generally we used 100o frames per second because it was the…

Overview: The goal of this experiment was to determine which membrane type adipose derived stem cells (ADSCs) would proliferate best on. The ADSCs grew over a  four day period and were imaged on days 1, 2, 3, and 4.  The cells…

Our main purpose of this project is to reduce or eliminate the protein non-specific adsorption on the oxidized siliconnitride sample surface. By synthesis the PEG molecular on the surface, we believe we can reach the goal. There are different ways…

Today, I finally demonstrated liftoff of microporous SiOx from a bare Si wafer.  The sample is a 2 x 2 cm section of wafer 209A02, which has a 100 nm layer of TEOS SiOx that stress stabilizing anneal.  The film…