Here are some high resolution TEM images from a SiMPore-UIUC collaborator.
Chris says:
The high resolution stuff looks pretty cool, especially the zoom-in on the 8nm pore. I the most obvious crystal planes are <111> with 0.314 nm spacing. If you look carefully, some 0.192 nm <110> planes and 0.136 nm <100> planes can also be seen. For reference, the Si-Si bond length is 0.235 nm.
The NPN tenting mechanism I’ve described in a few different posts has relied solely on mechanical technique. I poke the substrate with tweezers, or delaminate it with high electrical forces, or heat it up and let it contract while in contact with each other. It would scale very poorly if we tried to make this…
Introduction Extracorporeal membrane oxygenation (ECMO) devices are used to supply oxygen to patients when they are unable to get sufficient oxygen through their lungs. Miniaturizing an ECMO device could be beneficial for neonatal patients, as it would require less blood to prime the device and operate efficiently at a lower overall flow volume. Dialysis is…
Just a quick update on my status: I got the NPN pre-filters from Greg in Montreal and finished testing 15 of them last week, so this week I will start doing additional experiments. I plan to explore the size separation capabilities in KCl, which should give even tighter distributions than LiCl. I don’t plan on…
After some changes to my fabrication process, I can report a qualified successful TEER test with media (HBSS) in both channels. I utilized a shrink wrap method of fabrication as seen in a previous post. The test was not perfect because I ruptured the channel while moving the fabricated device to a microscope slide. Also,…
w565 is permeable to rhodamine. I tested two chips using 100uM rhodamine using a time step of .5 minutes. Click on pictures to see animations. position (1,-1) – While trying to do this first sample, MATLAB crashed and I was forced to take the movie about 7 minutes after the start. There is also a…
The idea of adding a pulldown modification to our bacteria assay protocol came about after we started to believe that pore discovery was our rate limiting step of the transmission process, discussed here. Initially, it seemed to benefit our assay as it bumped our performance up significantly. Upon closer inspection we realized that we had…
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very interesting. are you saying that the lattice spacings are exactly what the textbook values give? are the nanocrystals large enough to allow a precise measurement? can we deduce the nanocrystal size and shape from such images? or would twinning and other phenomena make this impossible?
The lattice spacings are within reasonable error of the textbook values, but obviously strains of a few % cannot be judged by the image alone. I usually try to measure the distance covered by 10 lattice fringes, and ten divide by 10 to get the average spacing.
Judging size/shape is a bit arbitrary and will likely vary with the focus position. However, approximate sizes and twin density in a set of nanocrystals could probably be reasonably estimated. Selected area diffraction patterns could provide additional data.