The hydraulic permeability of a membrane is the inverse of the fluid resistance normalized to the membrane area.
Experimentally it is found with
Where Q is the measured flow rate, 
It can be calculated from membrane properties with
Where 
Hi all, So this is slightly different from my previous post, but is perhaps much more important for the work that I am doing. This analysis is important because it allows us to determine the appropriate conditions at which to operate the system. Currently, I operate the device at a flow rate of 10 microliters/minute…
We’d like to get verification of the absorption spectra of our npAu/npMgF2 SERS structure. The SERS effect should occur where the absorbance is maximized. Total Light = Absorbance + Reflection||Scattering + Transmittance Last Friday, I had the opportunity to work with Jennifer Kruschwitz who possesses a Konica-Minolta integrating sphere spectrophotometer from 380-740 nm (10 nm…
We have a high school student, Nikita, (from my Summer Nanotech class) who is volunteering in the lab. Jim and I have assigned him the project of exploring diffusion of very small molecules through porous and putatively nonporous membranes. Currently, we are focusing on hydrogen peroxide (H2O2 = 34Da) and detecting it with the Amplex…
We were worried that Friday’s experiments were giving us a false positive results. If the electrophoresis breaks the membrane, then we’d expect to see the rhodamine rush through just like it was in our experiments. It’s too hard to view the membranes afterward because they tend to break during removal. I designed some simple tests…
For the past month, I have been working along with Tejas towards incorporating an ECM-like hydrogel into the back (edged side) of a pnc-Si chip. The purpose of this effort is to add another layer of complexity to Tejas’ in vitro microvasculature system, in order to study neutrophil migration across the endothelium. We first pondered…
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 were counted on each of these days to determine growth rates on each of the…