NRG

The purpose of this post is to see if there is a pattern in the Pore Density vs. Pore Radius graphs at certain manufacturing conditions. The following wafers all have widths of 15nm and RTPs of 1000. The porosities range from 6.48% to 8.33%. **** note: the y-axis label should actually read “pore density (#/nm2)”…

The goal of this rotation was to create a device to test the electro-osmotic properties of the membrane bound silicon chips. To perform this task, it was necessary to attach two glass pipettes onto both sides of a chip. The method required that the protocol be repeatable and easy to perform. Although it appears to…

Last week I made a post showing detection of detergent diffusion across membrane SC267. In the diffusion set up I had placed 6uL of a 50/50 volume ratio solution of 1.0% DDM and 1mg/mL BSA with 60uL of DI-water on the membranes backside. I allowed the setup to sit for two days and then used…

I’ve been thinking of demos/experiments to do with my upcoming class and one of them is SEM.  I was thinking of handing out some unknown nanoparticle solutions and have them figure out the size and maybe material by SEM, AFM and/or DLS. I’m approved to run the SEM now, so I hopped on today to…

Over the past few weeks, I have been trying to separate proteins with the SepCons. As a preliminary test, Barrett and I decided to first acertain that BSA could pass through a membrane with pinholes. Theoretically, the pinholes are so large that the BSA should easily pass through. However, it doesn’t appear that the BSA…

In an effort to measure the effects of bsa adsorption on pnc-Si, I made some samples from SC 073 (a good wafer for separations) and with the help of Graham Marsh (Waugh Lab), looked at them using AFM.  We did our first studies of the samples in water, just in case that drying somehow distorted…

In a previous post I showed that a colorimetric assay using sulfuric acid and phenol can be used to establish a linear relationship between known detergent concentrations and absorbance values. This assay proves helpful in the project related to Mark Dumont’s work in that it will allow detection of small quantities of detergents that pass…

This post is a follow-up to Professor McGrath’s post, “Permeabilities vs. pore sizes for ideal membranes.” In the aforementioned post, this equation is proposed: Ψ = Nπr2 Where Ψ is the porosity, N is the density of the pores, and r is the pore radius. Rearranging the above equation (assuming a constant porosity): Ψi =…

Last Friday, Chris and I met with Dave Glocker from Isoflux Inc., an expert in physcial vapor deposition.  Specifically, we wanted to get advice on the recent problems we’ve had with the AJA tool. Arcing from Lesker targets We recently decided to try new oxide targets from Lesker because the last batch of AJA targets…