Congrats Dave!
PhD Dec. 15, 2010 Thanks for Everything!
PhD Dec. 15, 2010 Thanks for Everything!
One of the features of the gold nanoparticle separations in SepCons that was under-appreciated by the reviewers at Science was the fact that we could get very high sieving coefficients in the neighborhood of the cut-off. For 5nm gold the sieving coefficient was 0.8 (i.e. the filtrate was 80% as concentrated as the stock solution)…
I asked Tom to add gold PES separations of NPs to his earlier figure and to evaluate the loss of NPs during the use of these filters compared to pnc-Si. Here is what he came up … All experiments (including pnc-Si) were done at 10 PSI with 200 ul of starting material above the membrane…
Today Barrett and I processed SiO2 deposition at RIT. This process was actually delayed due to the cleanroom scrubber failure last week. We deposited 30nm SiO2 on both sides of three wafers, #335, 341, and 345. Earlier in March, I tried 20nm and 40nm SiO2. It was found that 40nm SiO2 is so thick that…
Upload just for future reference. This includes the data of KMnO4 serial dilutions absorbance and the stir cell diffusion experiment.
I got three pinhole-free membranes from Karl after the inspection. They are from wafer#612. Locations are (-3, 1), (-3, 2), and (-3, 3). I used the UV/Ozone machine to oxidize and charge two of them while leaving the third one as a control. The protocol of UV/Ozone treatment was followed. The stir cell was set…
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 a solution, we might be able to make use of the potassium permanganate (KMnO4) solution…
As Jim suggested, we are not only going to reproduce what Chris and Tom did in the Nature paper but also trying to test the charge screening effect based on different salt concentrations. To do such experiments, we need to charge our Si membrane and at the same time oxidize it. At the end of…
I’ve added a page on cell culture applications to the knowledge wiki. Watch this page and edit it if the topic is of interest to you. Remember the wikis provide a place to comment on the changes you make … and to compare and restore prior content … … so don’t be shy.
I hope to bring this question to our group meeting. As we discussed before, we know that Cl- can be absorbed at the gold surface to screen the applied positive charge. We are using R6G as the filtration species, which is positively charged. So we must either use DI water as the buffer solution (we…