We deposited a 20/60/20 nm OSO stack for an ellipsometry test. We decided to try annealing the un-patterned wafer in the RTP at 1050 C with no susceptor with a 100 C/s ramp for 60 s.
The attached SEM images show pores forming. With these encouraging results, we are considering depositing 40, 50 and 60 nm thick a-Si on patterned wafers to re-investigate pore formation taking advantage of all of the latest advances in processing.
On Friday I posted results from a diffusion experiment in which I tested “treated” and “untreated” SC256 samples against the diffusion of a mixture of DDM and BSA. The DDM-BSA solution contained an initial DDM concentration of 1.0% and an initial BSA concentration of 2.5mg/mL; the solution also contained 20mM HEPES and was at a…
During the recent visit of Greg Madeijski to our Institute of Biophysics, Imaging & Optical Science (IBIOS) here in Nottingham we had the opportunity to try imaging cultures of cells on several nanoporous membranes, including CytoVu’s and also the unsupported TEM grids without SiN. Here is a short summary of our adventures, along with some…
UPDATE: I have since ported the program into Matlab. If you open the following zip document(Archive) you can run Find_Sieving_Coefficient. You can select a results file and after ~5 minutes the expected sieving coefficient for the pore distribution is spat out. Using Wolfram Alpha’s Mathematica programming language, I’ve implemented an amalgamation of different mathematical models…
The basic principle of inducing the osmotic pressure to suppress back pressure is based on the counterbalance of the opposing flows of solvent. Consider an electrolytic cell composed of a pair of Ag/AgCl electrodes and a Nafion-coated pnc-Si membrane separating NaCl solution into two halves. Initially, the electrolyte in either half has the same concentration…
Today I deposited two 30 nm thick Si films and annealed one at 1000 C for 1 min and the other at 1000 C for 5 min. My running hypothesis is that performing an Ar sputter after the silicon deposition creates “broken” bonds that seed crystallization. Therefore, the crystallization should nucleate at the interface and…
I found some good descriptions of hemodialysis experiments using rats. They all use a method possibly first described by (Rockel et al., 1978). (Galons, Trouard, Gmitro, & Lien, 1996) at U of Arizona used nephrectomized male Spraque-Dawley rats (Holtzmann Co., Madison, WI) weighing ~300 g to study the effects of hemodialysis on the apparent diffusion…
