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Analysis of pumping burst pressures of HD membranes
Sabrina’s post showed that on a bench top, with ‘blood’ source and return at ATM, the transmembrane burst pressure was between 0.5 psi and 1.5 psi, (initial and after DI or PBS flow for four hours). Extrapolating from Burst pressure chip tests for the 10 mm long HD chips, we can expect the burst pressure to be somewhere between…
Electrophoretic (Stir) Cell Update
I used the source meter that Chris brought over and tested the voltage at points across the chamber. I set up the system with 1x PBS at 15V (~10mA) with a pinholed membrane. I tested the voltage drop at the outer edges of the well, in the center, and the inner edge of the chamber…
Latest 2-chip Small Animal HD results
While the latest small animal studies was meant to be a test of the new 1-chip bonded HD devices, device failure resulted in the use of the older 2-chip 10-channel HD devices as used on previous experiments. Here is all the data, Sham, commercial, 75 nm NPN trial 1 and trial 2. Trial 1 had…
High salt concentrations (~50mM) shouldn't be used to tune effective pore sizes for gold colloid separations
What we’d like to have accompany the Sepcon filters is a general way to tune the pore sizes for any given separation. If, for instance, someone wanted to have a filter cutoff of 12nm, we could create a custom wafer with a mean pore size of roughly 17nm. But it would be much easier (and…
AJA qualification visit
Chris and I visited the AJA sputter company in Boston last week. The tool was fully functional and we were able to deposit several test wafers. Overall, we were impressed with the performance. The uniformity across a 6″ substrate was sub-1 %. This is certainly a huge improvement over the 3-5% uniformity we currently achieve…


