Similar Posts
Nanoparticles on pnc-Si and pnc-Si pores via SEM
I’ve been thinking of demos/experiments to do with my upcoming class and one of them is SEM. I was thinking of handing out some unknown nanoparticle solutions and have them figure out the size and maybe material by SEM, AFM and/or DLS. I’m approved to run the SEM now, so I hopped on today to…
Non-uniformity, of a different kind
Today I looked at a wafer (391) that had been annealed in the RTP on top of a 6″ wafer substrate. The idea is that the six inch substrate would create a “shadow” around the 4″ wafer which would improve thermal uniformity by blocking the multiple reflections from the lamps inside the chamber. Here is…
MgF2 cytocompatibility #3
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, and tissue culture plastic after ~96 hours. The devices were initially seeded at 5e5 cells/mL,…
Charged based separation theory
Diffusion based separation theory uses a hindrance model to explain how the pores affect the diffusion of molecules of different sizes. The simplest and most well known hindrance model is given by the Renkin Equation: where Dm is the diffusion coefficient within the membrane, D0 the free diffusion coefficient, and α the ratio of molecule…
First 4-Hour HD with 75-nm NPN
I assembled two 2-chip dialyzers using the thicker, 75-nm NPN membrane chips (10 mm long multichannel, 22 mm x 24 mm). The dialyzers were pumped full of IPA, to fill with fewer bubbles, then infused with PBS for at least one hour. Unfortunately both of these either broke when hooked up to the animal, or…