I have been trying to verify that my MgF2 material is cytocompatible (e.g. no different than tissue culture plastic), and attempted Live/Dead staining to confirm. The following images are from P6 HUVECs with Invitrogen L3224 Live/Dead stain on MgF2, NPN,…
Author: Greg Madejski
Greg is a McGrath Lab alumnus (2010-2020) who incorporates nanomembranes into a variety of devices. Currently, he works on detecting microplastics as the CEO of Parverio inc.
Vapor Condensation Inside a Nanocavity
My recent work has focused on wetting the inner portion of an attocavity with isobaric cooling to create condensation. We are trying to attack the problem of wetting through the nanomembrane without breaking the membrane. A perfectly dry membrane will always…
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Wetting of Nanocavities using Isobaric Cooling
Summary and Instructional video The simplest way to get something wet is to allow water to condense on the surface of the something. In our case, we have a number of nanocavities (~ 0.1 femtoliters) with porous tents over them. The…
Smooth and Suspended Nanomembrane Tents
I wrote about my experiences tenting nanomembranes here. I delaminated NPN material across a bunch of substrates and found that the film would actually form a nanocavity if spread across a sufficiently small surface (I estimated it to be 1-2…
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Magnesium Fluoride Burst Pressure Wafer #2
I was not entirely satisfied with the amount of data that I received from my last burst pressure wafer, so I processed another wafer. This wafer had some yield loss initially, as well as window sizes that were slightly smaller…
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Nanoporous Wallpaper
In my recent tenting posts, the membrane has shown that it can deform and wrap around edges. I wanted to follow up on this phenomenon and see if we could get a contiguous sheet of membrane around a PDMS edge (not…
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Scalable Tent Transfer Laser Manufacturing
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…
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Thermal Stress and NPN Tent Transfer
From my last two posts (Anodic Bonding, Ozone Bonding), it is clear that we have some sort of bonding going on between the freestanding membrane and the posts intended to support the membrane. However, we do not understand the nature…
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Ozone Bonding Vincent’s Chips SEM
We have wondered if we can skip anodic bonding and bond the chips using our UV ozone process. There are pros and cons to this approach, mainly that the setup and procedure is easy, but the contact and alignment is difficult.…
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Anodic Bonding Vincent’s Chip Stack
Previous posts: Anodic Bonding Theory, Anodic Bonding Setup I had originally hoped there would be enough residual impurity in the oxide layer to create a direct bond with Vincent’s chips. This was a foolish hope. Pyrex is at least…
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