Yesterday I was playing around with some PTFE nanopowder and mixed it with achohol and applied it on my mountain bike chain.
I am wondering if I throw this powder in river, are water cleaning units able to remove nano particles from the water? Not that I am going to do this, just curious.
"Not that I am going to do this," Sure, but eventually you'll wash your chain, and reapply the powder. So the particles end up in the river anyway.
If you're interested, read up on how PTFE is produced. Specifically the case in WV and Ohio with DuPont's precursor PTFE plant.
That said, motor oil with a brush, wipe it off, ignore dirt between oilings was shown to be the best for motorcycle chains, not sure about sprockets.
Here are some numbers: https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra0569...