There is some non-uniformity in air permeability based on the position but it is not very clear for wafers 318 and 319. The full wafer measurement in future will make this dependence more obvious.
Permeability of w319 is much higher then of w318 (RTP 1000C and 900C) as expected from TEM images where w319 has higher porosity.
I added new data (w303, 307,311, 313,316,318,319) to burst pressures book Membrane_Burst_Book.xls
Hi all, After experimenting with UV ozone bonding of PDMS to glass, Si, and pnc-Si for the past few weeks with Mike, we have reached the following conclusions: 1. The bonding of PDMS to glass is always stronger than the bonding of PDMS to Si and pnc-Si, given that all receive same treatment of UV…
I’ve tested several membrane types with the streaming potential apparatus in order to calculate zeta potential. Here are the results: All materials in the above chart have negative zeta potentials. Pnc-Si seems to have the highest overall potential, followed by PES then cellulose. Cellulose is prone to cracking and bursting at pressure above 7 PSI….
This is the second installment in a series of posts focused on the development of a method for measuring barrier permeability in the µSiM. In Part 1 we discussed the goal of making these measurements in situ at a position beneath the membrane. Because our preference is to use the trench down configuration in the…
Molar flow thought pores with different diameters under 1 psi. First, I calculated molar flow based on porosity histograms extracted from TEM images. And then compared it with the actual experimental data. Here are few examples of this. molar%20flow.ppt
The following is a plot of rhodamine diffusion for the experimental system at various time point: In this figure, the rhodamine approaches equilibrium, as defined as a filtrate/retentate value of 1. The 9x well chips have a larger active area and quicker diffusion. I have performed simulations of this system using COMSOL, and in this…
Previously I have shown that sample buffer can be used to lift adsorbed proteins off polymer membranes, which can then be imaged on a gel. I have used a similar procedure to assay adsorption on pnc-Si membranes. I used 4 samples from wafer 216 that all had pinholes. I incubated a drop of 1mg/mL BSA…