I brought some 20nm and 40nm Sepcons to Integrated NanoTechnologies last Wednesday. First, we passed some short radio-labeled DNA strands through a 40 nm Sepcon, and then some longer strands. Both were able to pass through the membrane with a transmission rate of ~70% (as measured by scintillation), and the length of the strand did…
Biomicrofluidics. 2013 Mar;7(2):26501. Epub 2013 Mar 13. Review article: Fabrication of nanofluidic devices. Duan C, Wang W, Xie Q. Department of Mechanical Engineering, Boston University, 110 Cummington Street, Boston, Massachusetts 02215, USA. Abstract Thanks to its unique features at the nanoscale, nanofluidics, the study and application of fluid flow in nanochannels/nanopores with at least one characteristic size…
https://www.seas.harvard.edu/news-events/press-releases/harvard-scientists-design-new-adaptive-material-inspired-by-tears
In Tuesday’s NRG, we wondered if the fact that some of Josh’s pores overlap could throw the PoreImageProcessor off enough to explain a 2x discrepancy between our theoretical hydraulic permeability and our experimental permeability (the experimental was lower). From this picture: I took the following close up: If we assumer that each of the sub-pores has a radius of…
Hey folks, Science Saturday is this Saturday and Sunday at the Rochester Science Center. We need volunteers to man our tables from 12-4pm on both Saturday and Sunday. Please indicate in the comments of this post if you can volunteer, and when you can volunteer. The tentative schedule is as follows: 12-1 Saturday – Greg,…
Hello everyone! After a long time waiting and setting up, the new AJA and RTP at Vanderbilt University now are ready to go! Here are a couple of pictures of the new AJA and RTP. I have been working on testing the new AJA for a while with my old recipes. The new AJA system…
Using a 6″ wafer, we start with 50 nm of RV SiN, then deposit 40 nm a-Si followed by 20 nm of SiO2. RTP of 1050 C, 100 C/s, 60s. JP patterned the wafer to make standard SEPCON chips. The pores were transferred to the SiN using RIE. The RIE etches faster at the perimeter…
It was decided during my rotation-review meeting to use a smaller PEG molecule (3-mer) for silanization of pncSi. Following is the brief description of the polymer. Boiling Point: 147-9°C @ 0.3mm Freezing Point: <0°C Specific Gravity: 1.16 Vapor Pressure, 25°: <0.1mm Vapor Density (air=1): >1…
Previously, I had gotten some inexplicable results showing that increasing salt concentration decreases the flow through a membrane. This makes no sense (and goes against our previous data) because we would expect electrostatic forces to counteract the flow, an effect called counterelectroosmosis by Zydney: “The situation in the presence of a net fluid flow through…
As the device animation shows, the layout of the chip has changed. The incorporation of through-vias in the bulk silicon allows me to eliminate a gasket wrapping around the filter, which was a large source of leaks. I used ozone bonding for 8 minutes for each layer to join the device together. I initially taped…