The image below was taken with UR’s new S/TEM, the FEI Technai F20. It has the capability of resolving lattice images which should benefit the materials development effort. However, we will still rely on Karen’s TEM for most of our imaging since the throughput is higher on that tool.
Ag/AgCl electrodes are used overwhelmingly in streaming potential and sometimes in electroosmosis. The benefit of using Ag/AgCl in electroosmosis should be less gas generation and the ability to make an enclosed pump. Here is some information on my attempt at Ag/AgCl EO. .2mm silver wires were coated with AgCl using protocol. Electrodes were immersed in…
I think the consistently low flow rates are a real bottleneck for all our fluid based experiments and must be overcome. On the production side, we are really pushing the limits of our capabilities to produce the current membrane geometry, which I consider to be crazy big at 0.1 x 2 mm!! Considering the 15…
Over the past few days Josh and I installed windows 7, windows office suite, Malvern’s Zetasizer software (available online), Tecan’s I-control software (available in the 3-ring binder in the glass cabinet above the machines), and chrome onto the new(er) laptop in the basement. I copied the files on the old computer that seemed relevant –…
The results of my last diffusion experiment regarding BSA and filtered IgG (using SC 364) were inconclusive. (See “Diffusion Test– filtered IgG and BSA”) Looking at the histogram of results, there is no clear difference between the absorption of filtered IgG and buffer A. For this follow up experiment, I used SC 442. Of the…
Regarding the single channel dialyzer chip with 20-nm thick nano-porous silicon membrane: 10 mm long, 300 µm deep, 500 µm wide channels. Now that we’ve shown that a measurable quantity of urea is filtered out of DI water in one pass through the single channel dialyzer chip, we turn our attention to “Things Which Must…
w312 Number of Pores HistogramContributed Area Histogram 5nm BSA-Au is detected in the filtrate after 24 hours. 10nm BSA-Au is not. The 5nm registers around 10nm after conjugation and the 10nm is closer to 15nm. This selected membrane is not very porous, although it does have pores (as high as 42nm) that would appear to…
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This is great news! The image is fascinating- there is no clear evidence for this amorphous phase here- and the apparent shape of the nanocrystals is very interesting- not at all spherical, it seems! Do you have more of these pictures? I think they can give us important clues on how the pores form.
Is the low throughput due to inexperience with the tool or is it the nature of the tool?
I agree, this material is highly crystalline. (On a similar note, Brian said that we need to be within +/- 0.5 degrees of the Bragg condition to see diffracting crystals.) I was only able to look at one sample today because it was the first time I touched the tool and we were being trained.
Throughput is limited on this TEM because you can only load one sample at a time (vs. two w/ Karen’s) and the pump time is significantly longer because of the higher vacuum requirement.