The retrial on cellulose (100kD) gold separations gave similar results to the first study (results from Tecan scans): particle salt results 5 0mM no au in filtrate, retentate concentration 15 0mM no au in filtrate 5 10mM no au in…

Inspired by JP’s work with the Veeco Wyko, I attempted to fit pressure-displacement curves with the equation for thin film deformation (Vlassak and Nix 1992) for two membrane geometries: 100um x 100um and 1000um x 1000um. The relationship between displacement…

This is just a little update on the results of the pnc-Si, cellulose, and pes separations.  When I added up the retentate and filtrate, it didn’t always equal the intensity of the starting sample (keeping in mind that I was…

Can viscosity be determined by dynamic light scattering?  Dynamic light scattering in essence measures the diffusion of particles and calculates the hydrodynamic radius using the Stokes-Einstein relation, D = kT/(6πηr).  To find a size using dynamic light scattering, you need…

We got a bunch of extremely nice EO wafers through the pipeline, and I’ve been trying to do some experiments with them.  There’s very few pinholes on these wafers, and the pores are beautiful.  My experiments so far have been…

To supplement the work that Dave’s been doing with carbonization, I’m doing some chemical stability/discoloration tests.  The first step of these tests is to measure the contact angles.  The following are images of contact angle tests and quantitative data from…

After seeing a reduction of pore size at 750 C, I decided to run three different soak times at a fixed acetylene concentration of 1 LPM.  As expected, the longer soak time resulted in more occlusion. It seems that the…

Dave deposited a series of wafers last week at different temperatures. SC 166 -SC 173 were deposited between RT and 300C. These wafers had Jess’ E.O mask pattern ( circular sepcon) with single , 3,6 and 9 squares. The wafers…

I set up separations with 100kD cutoff Microcon (cellulose) membranes and protein standards.  Here are the results: Due to shorter than normal gel, the myosin didn’t get resolved.  However we can see a separation that appears to be fairly sharp. …

Tom gave me a few samples to scan on the AFM.  PVP was added to the well side of the samples.  I scanned the pnc-Si side of the chips to see if/how the PVP came through the pores.  Samples were…