I measured burst pressures on two non-unifrom wafers w391, w393. They have lots of pinholes (especially w391) but the pressure they withstand is pretty high. I expected it to be much lower after looking at the membranes in the microscope.
The ‘Tong equation’ for liquid flow through a nanosieve is I refer you to the original paper for variable definitions (see page 285). For the flows that we see, this will always simplify to the much simpler equation … We can first appreciate that the factor will be ~1. This term decreases with increasing porosity…
What happens to cells when they are exposed to a series of bubbles with and without a dubbler? The purpose of this experiment was to prove the hypothesis that bubbles damage cells, and the dubbler prevents cells from experiencing bubble damage. The experiment was performed with a PBS flow rate of about 0.14 mL/min through…
This initial aim of this project was to obtain “pockets” with sub-100nm pores, while the top opening is much larger. Dr. Carter is the mastermind behind this project. The following simple fabrication process diagram explains the current approach. After initial failed experiments for obtaining very small openings, Marcela and I aimed for larger bead sizes…
See my previous post for background information. It has been established that diffusion of small particles (diameter < roughly 1/3 pore diameter) across ultrathin membranes is mediated almost entirely by the ability of the particle to discover a pore, rather than by its ability to diffuse through a pore once one has been found. In…
Theoretical molar flow is calculated for membranes with different porosities and is based on data extracted from TEM images using Mike’s program. Experimental data is calculated using air permeability test results. It is associated with porosity only through TEM data. Correlation between two is very good but some points do not agree. One of the…
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…
