Tom gave me a few samples to scan on the AFM. PVP was added to the well side of the samples. I scanned the pnc-Si side of the chips to see if/how the PVP came through the pores. Samples were from SC114. Two different areas of supported pnc-Si membrane on control (no PVP) chip: The…
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 is temperature dependent. Note: image processing was done on 100 kx micrographs with the exception…
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 character, and has many pinholes; w704: 200um series. 2) Silanization treatment (UVO chamber PDMS contamination;…
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 20 16.0 1.5 17.2 30 25.7 2.1 28.8 40 34.3 2.3 30.7 The particles aren’t…
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 Dimension of the slot. 2) Active Area. 3) Effective circumference. 4) Number of features on…
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 high pinhole density and the 30 and 50 nm films were low pinhole density. The…
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 well-controlled since I didn’t have enough samples. Therefore, I repeated this adhesion study with proper…
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 measured the viability of cells on RTP’ed pnc-Si and PET transwells 7 days after plating…
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 was the problem; either the membrane sucked up the fluid or it was drawn up…
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 deposited with 25 W substrate bias and annealed at 1000 C in the RTP with…