As the title states, these are images from the monolithically fabricated devices used by Kyle and Vincent in Ottawa. These devices were fractured with tweezers, then tilted and metallized with 5 nm of Pt, mounted on carbon tape.
This experiment is to determine if the time between the SC1 clean and when the wafers get deposited matter. Currently there is suspicion that an SC1 from an RCA clean should at RIT should be done right before deposition, . So what is done typically is that lithography steps are done weekly at RIT to…
All separations are 30 nm (diameter) gold nanoparticles in a 56 nm pore setup, with other parameters as described in my last post. Y-axis scale bar is in meters, x-axis scale is meaningless (the simulation is 1-D, and the width is added just for clarity’s sake). The membrane is at y = 0. Color corresponds…
Summary Statement: We have doubled our MgF2 yields (compared to nanoporous MgF2) by moving to thicker microporous membranes. While the increase in strength is more modest than initially expected, we have plenty of substrates for use in cell culture. Statistics: Window [mm] Average Std Dev Count 0.1 21.02 8.10 14 0.3 8.18 5.62 17 0.5 4.33…
Diffusion based separation theory uses a hindrance model to explain how the pores affect the diffusion of molecules of different sizes. The simplest and most well known hindrance model is given by the Renkin Equation: where Dm is the diffusion coefficient within the membrane, D0 the free diffusion coefficient, and α the ratio of molecule…
Michael and I have been working to create cell channels of varying widths and heights to test out a concept used in a paper we recently read as a group. This work claims to see cell cords in 12 hours, so no media renewal is necessary. The channels were made by layering and bonding…
EDIT – 2/10/14 – Adding 1 mM phosphate buffer fixes the problems outlined in this post. I’ve been having some trouble taking consistent pH measurements with the new pH probe. Prior to Thanksgiving I made a spectrum of 10 mM KCl buffers (at 4, 6, 7, 8, and 10 pH units) for use in my…
Comments are closed.
Thanks for getting these Greg. A few comments: The first montage, you point out the large under etch…this was a known condition that was expected. Its due to the XeF2 gas, which is very isotropic. As for the debris, this is also a known condition, also due to the XeF2, I believe this is due to contaminates in the poly-Si as deposited (at RIT) and because the selectivity of XeF2 is absurdly high, it does not etch at all. I do not think these ‘crumbs’ would interfere with pore formation since they are not continuous, and since the pores are actually enlarging, they probably are being dissolved in the KCl solution (and therefore not plugging the pore).