In the last month, we’ve run several sets of 15 nm pnc-Si wafers over a range of RTP temperatures. Below is a chart that illustrates the current pore size control we have by tuning annealing temp. The 900 C, 950…
Category: NRG
UV-Ozone treated SC267: DDM passes and BSA held back
Building on my recent posts I ran an experiment with SC267 testing the ability of BSA and DDM to diffuse through UV-Ozone treated (20min at 150C) and untreated samples. I used four samples testing both BSA and DDM in the…
Posted in NRG
Diffusion to equilibrium dependent on geometry
In order to further test the model, I’ve set up additional rhodamine diffusion assays. In each case, the setup is similar to the nanoparticle/protein/dna separations – 20 uL of .5 mM rhodamine on the top of a SepCon and 20…
Posted in NRG
Dye Diffuses through UV-Ozone Treated and Untreated SC267 Samples
In my last post I presented the results of an experiment in which it appeared that BSA did not diffuse through a SC267 sample treated in the UV-Ozone system for 20min at 150C. As a control I also ran BSA…
Posted in NRG
More Modeling
Frustration with the lack of agreement with experimental device has led me to check if the diffusion in the wells within the model is physically relavent. To do so I’ve solved a partial differential equation pertaining to a concentration of…
Posted in NRG
Diffusion of BSA through SC267 prevented using UV-Ozone
As mentioned in my previous few posts Justin and I have been working to characterize contact angles resultant from various exposures in the UV-Ozone system. Earlier this week we got our new oxygen tank installed and it appears that after…
Posted in NRG
Rhodamine diffusion experiments
In effort to understand the model, I have been studying simple diffusion experiments using rhodamine, a small molecule expected to experience little hindrance. The model currently expects a small molecule the size of rhodamine to reach equilibrium within 1.5 hours.…
Posted in NRG
Electrolysis through TEM Chips
Continuing the project that Mark had been working on, I have made some progress towards electroosmosis. Specifically, I was able to observe electrolysis through an intact membrane. Hopefully I will be able to observe electroosmosis through the movement of microspheres…
Posted in NRG
Playing with the model
This is an update of my progress with the diffusion model. Sieving coefficients for standard setup (Renkin only) In this image there’s a strong sigmoidal curve for the 24 hour diffusion. However, the cutoff (~34nm) is higher than cutoffs…
Posted in NRG
UV-Ozone Contact Angle Measurements
Last week I made a post showing the diffusion of DDM and BSA through SC267. I an effort to increase the negative charge associated with the membrane material I proposed using UV-Ozone exposure. A while back there was some concern…
Posted in NRG
