Separation of Nanoparticles using surface acoustic radiation force:  Surface acoustic waves (SAW) can be defined as mechanical waves which propagate on the surface of an elastic medium which most of its energy is concentrated in the surface. It’s been used…

Having generated some tomograms of various Au, NPN, and MgF2 nanostructures in the past months, I should be able to parameterize these structures. I have many questions about how the nanostructures actually effect SERS performance. In general, we can use…

I’ve received some of the very first MgF2 material that I produced way back when and shipped off to Nottingham. These chips were produced from NPN wafer 1085 (5-slots). There are a few membranes still remaining, but mostly the chips…

Thanks to Kilean for the TEMs. One of the properties that influences strong SERS behavior is surface roughness; rougher metals produce a better SERS effect. People have electrochemically roughened surfaces before to make better SERS sensors. The following quote is from…

Another set of images of both sides of a membrane, this time something weird is happening… It looks as though I’m missing some holes from the top side. They looked to be filled in but are not when seen from…

While JK has been processing backside images from 50 nm, 75 nm, and 100 nm membrane SEM images for pore information, I thought I’d take a look at a 100 nm membrane from both the front and the back at…

These are the sieving curves for 50, 75, and 100 nm NPN membranes. The 75 nm NPN 30 nm gold data point is just an estimate, since the membrane broke before enough filtrate could be collected for an absorbance measurement. However,…

Here is a better, more thoughtful, attempt at pore processing of a single image of the backside of a 75-nm thick membrane (four slot). One thing you will note that could be different from the analysis of the frontside of the…

While I have been in Montreal with Albert Kamanzi and Sabrina Leslie, Albert mentioned to me a cleaning protocol that appears to strip off NPN. 5 mL of Hellmanex III in 100 mL of DI water Placed in heated water bath, covered…

All of the images are from the same 75 nm NPN four-channel chip. The first images shows the edges from the backside of the chip, showing how flat it is (without the oxynitride present on the top side). There is…