This is preliminary data for air permeability in track-etched membranes for membranes with different pore radius.
For comparison here is a table of the performance characteristics for TE membranes
Measured data is of the same order as official TE membranes data.
In the soon to be submitted paper on diffusion models, we list two contributions to membrane resistance. The first is due to the steric and frictional hindrance a molecule encounters as it enters and diffuses through a pore (Renkin, Deen). The second is due to the time that it takes for the molecule to diffuse…
So I talked a bit with Philippe today about the water permeability data, and he suggested that I try to see if there’s a correlation between what the histogram looks like and the experimental permeability’s relation to the theory. I pulled out all the histograms and here’s what I could find. Two of the membranes…
SET-UP Syringe pump: 5 mL of 7.6-nmol/100µL, 5.6 µL/min pump rate. Single Channel dialyser, 10 mm long, 0.5 mm wide, 0.3 mm high in stirred beaker of DI water Fraction Collector programed to rotate every 30 min. Set up in refrigerator, 40˚C. Figure 1: Long term dialysis clearance set up in refrigerator. Syringe pump, stirred…
We created a 25-40-25 OSO stack with a SEPCON pattern. RTP at 1050 C 100 C/s 60 s. The following images show a comparison between the STEM detector and the SEM detector, and then a couple more images at 100 kx and 50 kx. I calculated a porosity of ~6.5 %, and…
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 and pressure is: P = pressure, d = displacement, C1 and C2 are geometric coefficients,…
I first wrote about quantifying the pore formation process using kinetic theory last year. In this post, I will develop my thoughts a bit more. In the literature, researchers oftentimes present charts, like the two shown below, describing the Arrhenius behavior of silicon crystallization (Sontheimer APL 95 2009). Figures 3 and 4 show the crystal…
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At what pressure was the data in the table acquired?