I'm working on a magnetic nanoparticle detector and I want to test it with magnetic nanoparticles attached to some biological structures, like cells or something. I want to see if the sensor is able to distinguish between cells with or without nanoparticles. It has to be something that can survive at room temperature and without water (or maybe just a tiny droplet).
You can find bunch of companies in following attachment which sell antibodies-nanoparticles conjugates.
So it's going to be difficult finding CELLS that will fit through a nanopore, or a nanometer scale detector, as even bacterial cells are on the micron level. Viruses, you may have something there.
Ujwal's article is a few years old, but some very good info there and a good place to start. Dynal (Thermo Fisher), Merck/EMD-Millipore...good places to call and ask some questions on capability.
If you require a small quantity then several researchers can help you to provide samples which may be economical. You may contact researchers by sending e-mails
whose ID are attached here.
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