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High resolution TEM images from Hitachi
Jamie asked me to post these images of our membranes taken by Dr. Xiao Zhang from Hitachi. They used a 300 kV tool to acquire these micrographs. The spacing between the atoms (striations) tells us the crystallographic orientation; most of the nanocrystals we see are in a (111) orientation. It’s interesting that the perimeter of…
Microporous (0.4 um) MgF2 has roughly the same material purity as nanoporous MgF2
I was concerned that even though my calculations for etching the microporous MgF2 material show that the silicon nitride was being removed completely, not all of the silicon nitride was indeed being removed. Hypothetically, the presence of additional remnants of silicon nitride could be causing additional film stress and cause membranes to break more frequently. I…
PDMS Connector without capillaries
I found this article about a macro-microfluidic interconnect that I want to try out at some point. We might even be able to seal tube-block interface with PDMS for a tighter seal. http://blogs.rsc.org/chipsandtips/2006/11/13/a-simple-interface-between-a-pdms-microfluidic-device-and-a-syringe/ A simple interface between a PDMS microfluidic device and a syringe 13 Nov 2006 By Francesca Burgoyne. Jeonggi Seo and Meng…
Contact area dictates early cell-substrate interaction for endothelial cells on porous membranes
ByAnaAbstract Endothelial cell attachment to porous substrates via focal adhesions is initially affected by pore spacing and not absolute porosity. Maturation of endothelial monolayers via cell-cell interactions occurred over the same time course regardless of substrate porosity, pore size and contact area. Cell-matrix interactions at maturity were dictated by substrate stiffness. Data [missing figure] Fig. 4 Endothelial…
Hydraulic permeability of SiN-NP wafer #'s 1029 and 1030 with "clean" water
Sarah, Tejas, and I bought some “Invitrogen Ultrapure DI water” from the medical center to see if we would find a different permeability using the clean water vs the water from the Barnstead. Sarah and I repeated our permeability tests but made sure to measure the flow rate for the first 100 uL. We got…
Distributions of in-Situ formed Au Nanoparticles
Jirachai’s recent post on the formation of Au nanoparticles on the surface of the NPN is very exciting. For one, it is a very dense monolayer of particles. This self assembly mechanism is magnificent whereas if we tried to dry down a layer of particles, we would get a cake layer similar to what Josh…