A couple weeks ago, I showed some preliminary data on H2O2 detection via the Amplex Red Assay, which is a project for one of our high school students. This generated some discussion at the last NRG meeting about diffusion through…
Category: NRG
Separation Model Update
In the past couple of weeks I’ve tried a few more molecules to flesh out the experimental verification of the separations model. This is a quick update of the results. In the following figure, the blue line is the predicted…
Posted in NRG
Changes in nanocrystalline structure due to mechanical stress
One of the things that I’ve been working on recently is trying to explain the extreme elasticity of the pnc-Si material which is connected to its nanocrystalline structure. There are two parts in this question. First, how are amorphous or…
Posted in NRG
Diffusion boosts sieving coefficients in dead-end filtration through pnc-Si
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…
Posted in NRG
Analysis of hydraulic permeability calculated from centrifuge experiments
The current method of testing water permeability through SepCons is to place a volume of water inside a SepCon and spin it inside a centrifuge. After a set period of time, the volume passed is collected. The “approximate” permeability can…
Posted in NRG
(Very) small molecule diffusion through pnc-Si transwells
We have a high school student, Nikita, (from my Summer Nanotech class) who is volunteering in the lab. Jim and I have assigned him the project of exploring diffusion of very small molecules through porous and putatively nonporous membranes. Currently,…
Posted in NRG
Pore morphology is RTP time dependent (part II)
In the last production cycle, there were several wafers annealed for longer than our standard 1 minute RTP soak time. Recall in my earlier post, I observed a significant change in pore morphology in a 30 nm thick silicon membrane…
Posted in NRG
Endothelial cells form vacuoles within 1 day on pnc-Si
In this experiment, I wanted to test how quickly vacuoles form in endothelial cells when cultured on pnc-Si transwells. Here I used 30nm SC502 RTP’ed samples with the pnc-Si side down. I seeded P9 bEnd3 cells at 50000 cells/cm2 on…
Posted in NRG
Pore vs. charge separations
This is a draft of a figure I think I’d like to use in my upcoming paper about charge based separations (this paper will include the Bernhard data). I thought I’d post it here first to get some feedback. I’ll…
Posted in NRG
Induced non-uniformity in Si over a single wafer
A while back, we discussed leaving the rotation stage off during the a-Si deposition to induce a thickness gradient over a single wafer. The purpose of this experiment was to explore the different morphologies vs. thickness at a given RTP…
Posted in NRG
