The goal of our work is a low-cost, portable device that will perform rapid and efficient leukocyte count assays required for treatment of HIV positive patients. The device in mind will benefit from the advantages associated with microfluidic systems such…
Category: NRG
Booth and Kim (2012) micro-BBB device
Here is the paper I reviewed at the NRG meeting on 06/19. Utah Group Micro BBB Device I’ve also included my presentation: BBB Device Presentation This week I’m working on designing the basal and apical chambers, considering the necessary shear…
Posted in NRG
BSA Retention in Single Channel Dialyzer
Regarding the single channel dialyzer chip with 20-nm thick nano-porous silicon membrane: 10 mm long, 300 µm deep, 500 µm wide channels. Now that we’ve shown that a measurable quantity of urea is filtered out of DI water in one…
Multi-annealing of free standing OSO stack (2)
Last time I showed that the sample with multi-annealing yielded higher porosity and larger average pore diameter than the sample with direct annealing. In this post, I further investigate the multi-annealing of free standing OSO stack (20/15/10) by varying the…
Posted in NRG
Permeance/Porosity and Burst Pressure
Permeance of a sample was first calculated by taking a TEM image of the membrane and extracting pore size histograms. The flow rate through each pore can be calculated and then summed to determine the flow rate through the sample.…
Posted in NRG
Barcikowski separations
The samples of nanoparticles from the Barcikowski lab finally arrived after 9 days in transport. Regrettably, the ice pack they shipped with was completely dead, and it is possible that the samples were in some way ruined. After we received…
Posted in NRG
Single Channel Dialyzer
The main difficulty with creating a simulation of the single channel dialysis chip is that the membrane is so very thin (20 nm). This is especially true when compared to its length of 10 mm but also when compared to…
Single Channel 20 nm membrane breakage…
There is a reliability/handling issue with the single slot chips. 0.5 mm x 10 mm slots, 20 nm thick membranes with 40 nm SiN reinforcement. The membranes are easily packaged in an upper fluidic PDMS layer with inlet/outlets and two…
Multi-step annealing of free-standing OSO stack
It is well believed that the pore formation is directly related to the silicon crystallization. In this post, I’m gonna further show that how does the crystallization process affect the pore formation. The crystallization process can be divided into two…
Posted in NRG
Pore formation process
We have suspected that those non-open pores in the TEM image of pnc-Si are pits in the silicon membrane for a long time. Last week, I SEMed a sample, oxide (30nm)/Si(25nm)/oxide(30nm) annealed at 800C for 1min, to verify the pits…
Posted in NRG
