I measured the I-V characteristics of our coated membranes on Wed. at RIT. JP observed the measurement. The semicon parameter analyzer in the test lab is “old” but isexactly what we need! Roughly speaking, our coated membraneshave resistance about 2k Ohm, depending on the thicknesses ofmetal films (this is based on pure Ti coated samples,…
Last week’s production yielded six wafers, all deposited at room temperature. Here were the annealing conditions: Wafer 334, 343 – RTP @ 975CWafer 341, 344 – RTP @ 975C + FA @ 1000CWafer 342, 345 – FA @ 1000 C Pinhole density was moderate along the edges of the wafer, with one or two pinholes…
I used the EQ format to test the 100K microcons in a wet-wet trial using DI water. The below illustrates a comparison between the hydraulic permeability of the 100K microcons in a wet-dry format (from tests earlier today) vs. a wet-wet format. The group on the left (1) represents the wet-dry tests done earlier today…
I reran the 100K Microcon membranes using bovine albumin. This time I ran a set of four fresh membranes with DI water for a preliminary trial. Once complete I used two of the same four membranes with a 1mg/mL solution of bovine albumin in PBS to test the effects of protein; the other two membranes…
The permeability data is very different for films deposited at room temeperature and 400C.The 400C deposited wafers have much higher permeability and more consistent. w335 – RT w336-RT w338 -400C w340 – 400C Burst Pressures
The ‘Tong equation’ for liquid flow through a nanosieve is I refer you to the original paper for variable definitions (see page 285). For the flows that we see, this will always simplify to the much simpler equation … We can first appreciate that the factor will be ~1. This term decreases with increasing porosity…
We have recently been discussing the best way to analyze the diffusion and SepCon separation gels. In the following figures, I present line scans of the gels. These appear to be a bit noisy and are somewhat misaligned due to variations along the length of the gel. Blue = Control, Green = Retentate, Red =…
Using wafer 302 I set up 2 20nm and 2 50nm gold diffusion experiments. After 24 hrs I removed the retentate and filtrate and looked for the gold using the Malvern Zetasizer. We can’t perform the diffusion with both 20nm and 50nm gold because the Zetasizer cannot differentiate between the two sizes. r value Sample…
Last week we processed wafers 335 – 340. Our goal was to track down the source of Cu contamination. We sputtered membrane films both at room temperature and at 400 C. Our thought was that the RT dep. would not show contamination if the sputter heater was indeed the source of our Cu. It turns…
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…