Last week I ran a series of membranes through the carbonization process at four different temperatures (600, 700, 750 and 800 C) at a fixed acetylene concentration (1 LPM). As expected, the growth of the carbon ring around our pores…
Category: NRG
Long term discoloration II
There have been differences between the previous long term discoloration studies carried out by myself and Barrett. Couple of reasons speculated for the differences were: 1) Wafer variation (w683 vs w704); w683: has no visible pores, is more amorphous in…
TEM of Particles
Here are the sizes of the particle ladder by TEM. I compare to the previous unmodified DLS results in this table. Manufacturer’s Size TEM size Stdev DLS Size 5 6.6 .6 8 10 7.8 .9 9.4 15 12.7 .9 13.2…
Posted in NRG
B.P with Thickness of Material
In an effort to understand the material property using burst pressure, a few key variables have to be analyzed to determine their effect on burst pressure. These variables are: 1) Shape : a) Maximum Dimension of the slot. b) Minimum…
Posted in NRG
Burst Pressure Vs Thickness Series( 50 nm vs 30nm)
Last week Dave deposited sep-cons ( cell culture mask) with 3 different thickness namely the regular 15nm , 30 nm and 50nm ( SC 142, 143,144). These wafers were characterized and it was noted that the 15 nm had a…
Posted in NRG
Short-term Cell Adhesion Morphology
We’ve been getting some strange cell morphologies recently in short-term adhesion studies. My previous post on this subject links to a few of these results. Unfortunately, my last experiment into short-term cell morphologies on autoclaved and EtOH- sterilized samples wasn’t…
Posted in NRG
Long-term viability – pnc-Si and PET transwells
Some transwell cell culture models require 1 week or more of cell growth in order to let the cells fully differentiate and form mature monolayer barriers. I had a couple of leftover samples a couple of weeks ago, so I…
Posted in NRG
PES protein separations
This was the first try at using PES for protein separations by diffusion. 100kD cutoff Nanoseps were used to separate 10mM KCl and 100mM KCl standards. In both cases, the backside fluid was gone after 24hours. I don’t think evaporation…
Posted in NRG
Deposition temperature series
With the new heater installed in the AJA sputter tool, the production team decided to run a set of wafers at six different chamber temperatures to re-characterize membrane morphology, mechanical strength and overall quality of material. These films were all…
Posted in NRG
Carbonization can occlude pores
Last week I reported that carbonization can shrink pores. This week I was able to completely occlude the pores with a change in the process recipe. Instead of cutting off the acetylene flow before the thermal treatment, I kept the…
Posted in NRG
