In continuation of the previous post, its been further observed that O2 RTP treated samples remain unchanged whereas the Ar RTP treated samples started to discolor after a week, as shown in the following images: In order (left to right)1. Ozone+Ar RTP2. Ozone+O2 RTP3. Control (Untreated)4. Ar RTP5. O2 RTP
I briefly experimented with the track-etched membranes this morning and found that they are extremely fragile and near impossible to cut. I disassembled a few of the microcons and found that a circular piece of paper the size of a hole punch (like the one on the bench by the mac) fits perfectly into the…
I retested the 100K Microcon, 100K Nanosep, and 300K Nanosep membranes at 1000RPM, which in the clinical centrifuge is 4.33psi by my calculations. I retested the 100K Nanosep just to make sure that we had some solid permeability values. I retested the 300K Nanosep because of the extremely low permeability I calculated for the first…
I tested those membranes from w335 and w341 with approximately 40 nm of deposited oxide on both sides for air permeability and burst pressures. There was tiny amount of air flow (I checked for leak) from few of them which I didn’t expect with such thick oxide. The burst pressures are higher then without the…
As per Jim’s suggestion, I coated wafers 335 and 341 with 40.6nm SiO2 on top and 42nm SiO2 at backside. The membrane cells have been passed to Anant and Maryna for chemical stability and air flow tests. Today I got some TEM images from the medical center with the help from Karen.We first imaged wafer341…
Just to double check the numbers I calculated on Tuesday I ran some wet-wet trials with 100K and 300K Nanoseps. Based on the wet-dry results we would expect that the permeability for the 100K Nanosep would be higher than that of the 100K Microcon. It goes without saying that the 300K Nanosep would also be…
UV Ozone treated W404 sample testing (benchtop) : In EGM In L15 In DMEM In each row, the first two samples (from left) are UV Ozone treated whereas the next two are not.It can be observed that there is no significant difference in discoloration due to the treatment after ~15 hrs. Note: The starting color…
W407 (non treated) in different NaCl salt concentrations (benchtop) : At t=0 In order (from l-r)1. 0.5 M NaCl2. 1.0 M NaCl3. 2.0 M NaCl At t=24 hrs. At t=53 hrs. At t=6 hrs and t=12 hrs the chips were not found to be discolored.This was carried out to test the stability of the membranes…
Membrane stabilityNon treatedW404 samples in DMEM 15um beads on the membrane:15um beads below the slit:In order: (left to right)1. t=02. t=33. t=64. t=105. t=13 hrs.Non treated W336 samples in DMEM15um beads on the membrane:15um beads below the slit:In order: (left to right)1. t=02. t=123. t=264. t=315. t=48 hrs.Chip discolorationNon treated W404 samples in DMEMIn order:…