I discussed with Jess the possibility of using a negatively charged dye. People did use such dyes before but we probably need to order them at this time. Since now we can use the spectrophotometer to determine the concentration of…
Category: NRG
WordPress updates
I’ve upgraded the WordPress publisher to version 2.6. The most useful change is the ability to track changes to any post/page, compare revisions, and revert to an older version. Here’s a video showing the changes: https://videopress.com/v/mARhRBcT/fmt_std Additionally, I’ve installed some…
Posted in NRG
Desalting with Intact Membranes: Continued
As mentioned previously intact membranes show a flux comparable to membranes with pinholes during desalting experiments. To confirm this a third intact membrane test and two pinholed tests were run under the exact same conditions. Previous pinholed samples had different…
Humidity is Affecting PDMS-pncSi Bonding
A few weeks ago Dave dropped of a humidity monitor for the third floor equipment room. Since then I have been recording the humidity every time I run a UV Ozone process for PDMS-glass or PDMS-pncSi bonding and there seems…
Change in Pore Image Processor
Yesterday I found a bug in the pore image processor. The “i” hotkey is supposed to save the current image, but it wasn’t working. I contacted Mike Bindschadler and he fixed it. The updated version can be found here. The…
Attempt at UV/Ozone to Clean Membranes of Organic Impurity
I tried to clean samples from W615 using UV/ozone to cleanse the membranes of the organic impurities we have been seeing lately. I followed the UV/ozone protocol, with a stage temp of 25C and treatment time of 5 minutes. No…
Repeated Success with Flow System
Yesterday I started a test to try and reproduce the results Henry was able to obtain with a closed flow system last week. Using four samples (W619) I ran the UV Ozone bonding process and allowed them to sit over…
W612 Characterization
I tested W612 for air permeability and burst pressure, shown below. It should be noted that the air permeability and burst pressure values are comparable to W504; looks like a good reproduction! I also tested a sample with the hexane…
RTP Time Variation for Cell Culture
In an attempt to improve membrane life in cell culture, different RTP times were tried on a single wafer. Samples from W514 were RTPed in Ar at 800C for 1, 5, and 10 minutes, respectively. Cells were then seeded at…
Closed Flow System Update
Just an update on the closed flow systems I put together yesterday using vacuum grease. Even with the vacuum grease at the point of entrance of the capillary tube to the PDMS-pncSi system the PDMS was able to get into…
